ADVERSE REACTIONS SECTION.

6 ADVERSE REACTIONS. The following serious adverse reactions are described elsewhere in the labeling:Serious Cardiopulmonary Reactions [see Warnings and Precautions (5.1)] Hypersensitivity Reactions [see Warnings and Precautions (5.2)] Serious Cardiopulmonary Reactions [see Warnings and Precautions (5.1)] Hypersensitivity Reactions [see Warnings and Precautions (5.2)] The most common adverse reactions (>=0.5%) are headache, back/renal pain, flushing, nausea, chest pain, injection site reactions, and dizziness (6).To report SUSPECTED ADVERSE REACTIONS, contact Lantheus Medical Imaging, Inc. at 1-800-362-2668 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1Clinical Trials Experience. Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.A total of 1716 subjects were evaluated in pre-market clinical trials of activated DEFINITY. In this group, 1063 (61.9%) were male and 653 (38.1%) were female, 1328 (77.4%) were White, 258 (15.0%) were Black, 74 (4.3%) were Hispanic, and 56 (3.3%) were classified as other racial or ethnic groups. The mean age was 56.1 years (range 18 to 93). Of these, 144 (8.4%) had at least one adverse reaction (Table 1). There were 26 serious adverse events and 15 (0.9%) subjects discontinued because of an adverse event.. Serious Adverse ReactionsAmong the 1716 study patients, 19 (1.1%) suffered serious cardiopulmonary adverse reactions.For all adverse reactions, the overall incidence of adverse experiences was similar for the <65 year age group and the 65 year age group, similar in males and in females, similar among all racial or ethnic groups, and similar for bolus and infusion dosing. Table summarizes the most common adverse reactions.Table 1New-Onset Adverse Reactions Occurring in >=0.5% of All DEFINITY-Treated SubjectsN=Sample size 1716 subjects who received activated DEFINITYn=Number of subjects reporting at least one Adverse ReactionDEFINITY (N=1716)Total Number of Adverse Reactions269Total Number of Subjects with an Adverse Reaction144(8.4%)Body system Preferred termn(%)Application Site Disorders11(0.6) Injection Site Reactions11(0.6)Body as Whole41(2.4) Back/renal pain20(1.2) Chest pain13(0.8)Central and peripheral nervous system disorder54(3.1) Headache40(2.3) Dizziness11(0.6)Gastrointestinal system31(1.8) Nausea17(1.0)Vascular (extracardiac) disorders19(1.1) Flushing19(1.1)Other adverse reactions that occurred in <=0.5% of the activated DEFINITY-dosed subjects were:Body as Whole: Fatigue, fever, hot flushes, pain, rigors, and syncopeCardiovascular: Abnormal ECGs, bradycardia, tachycardia, palpitation, hypertension and hypotensionDigestive: Dyspepsia, dry mouth, tongue disorder, toothache, abdominal pain, diarrhea and vomitingHematology: Granulocytosis, leukocytosis, leukopenia, and eosinophiliaMusculoskeletal: ArthralgiaNervous System: Leg cramps, hypertonia, vertigo and paresthesiaPlatelet, Bleeding, and Clotting: HematomaRespiratory: Coughing, hypoxia, pharyngitis, rhinitis and dyspneaSpecial Senses: Decreased hearing, conjunctivitis, abnormal vision and taste perversionSkin: Pruritus, rash, erythematous rash, urticaria, increased sweating, and dry skinUrinary: Albuminuria. 6.2Postmarketing Experience. In prospective, multicenter, open-label registry of 1053 patients receiving DEFINITY in routine clinical practice, heart rate, respiratory rate, and pulse oximetry were monitored for 30 minutes after DEFINITY administration. No deaths or serious adverse reactions were reported, suggesting that these reactions are unlikely to occur at rate of more than 0.3% when DEFINITY is used according to recommendations.The following adverse reactions have been identified during the post-marketing use of perflutren and PEG-containing microsphere products. Because these reactions are reported voluntarily from population of uncertain size, it is not always possible to reliably estimate their frequency or establish causal relationship to drug exposure.Fatal cardiopulmonary and hypersensitivity reactions and other serious but non-fatal adverse reactions were uncommonly reported. These reactions typically occurred within 30 minutes of DEFINITY administration. These serious reactions may be increased among patients with pre-existing PEG hypersensitivity and/or unstable cardiopulmonary conditions (acute myocardial infarction, acute coronary artery syndromes, worsening or unstable congestive heart failure, or serious ventricular arrhythmias [see Warnings and Precautions (5.1, 5.2)] Reported reactions included:. CardiopulmonaryFatal cardiac or respiratory arrest, shock, syncope, symptomatic arrhythmias (atrial fibrillation, tachycardia, bradycardia, supraventricular tachycardia, ventricular fibrillation, ventricular tachycardia), hypertension, hypotension, dyspnea, hypoxia, chest pain, respiratory distress, stridor, wheezing.. HypersensitivityAnaphylaxis, with manifestations that may include death, shock, bronchospasm, throat tightness, angioedema, edema (pharyngeal, palatal, mouth, peripheral, localized), swelling (face, eye, lip, tongue, upper airway), facial hypoesthesia, rash, urticaria, pruritus, flushing, and erythema.. NeurologicComa, loss of consciousness, convulsion, seizure, transient ischemic attack, agitation, tremor, vision blurred, dizziness, headache, fatigue.

BOXED WARNING SECTION.

WARNING: SERIOUS CARDIOPULMONARY REACTIONS. Serious cardiopulmonary reactions, including fatalities, have occurred uncommonly during or following perflutren-containing microsphere administration [see Warnings and Precautions (5.1)]. Most serious reactions occur within 30 minutes of administration.Assess all patients for the presence of any condition that precludes DEFINITY RT administration [see Contraindications (4)].Always have resuscitation equipment and trained personnel readily available.. Assess all patients for the presence of any condition that precludes DEFINITY RT administration [see Contraindications (4)].. Always have resuscitation equipment and trained personnel readily available.. WARNING: SERIOUS CARDIOPULMONARY REACTIONSSee full prescribing information for complete boxed warningSerious cardiopulmonary reactions, including fatalities, have occurred uncommonly during or following perflutren-containing microsphere administration (5.1). Most serious reactions occur within 30 minutes of administration.Assess all patients for the presence of any condition that precludes DEFINITY RT administration (4).Always have resuscitation equipment and trained personnel readily available.. Assess all patients for the presence of any condition that precludes DEFINITY RT administration (4).. Always have resuscitation equipment and trained personnel readily available.

CARCINOGENESIS & MUTAGENESIS & IMPAIRMENT OF FERTILITY SECTION.

13.1Carcinogenesis, Mutagenesis, and Impairment of Fertility. Studies with activated DEFINITY have not been performed to evaluate carcinogenic potential. Evidence of genotoxicity was not found in the following studies with activated DEFINITY: 1) bacterial mutagenesis assay (Ames assay), 2) in vitro mammalian mutagenesis assay, 3) in vitro human lymphocyte chromosome aberration assay, and 4) in vivo rat micronucleus assay.Impairment of male or female fertility was not observed in rats and rabbits treated with activated DEFINITY at doses up to 24 and 15 times the human dose based on body surface area (in rats and rabbits respectively).

CLINICAL PHARMACOLOGY SECTION.

12CLINICAL PHARMACOLOGY. 12.1Mechanism of Action. Perflutren lipid microspheres exhibit lower acoustic impedance than blood and enhance the intrinsic backscatter of blood. These physical acoustic properties of activated DEFINITY RT provide contrast enhancement of the left ventricular chamber and aid delineation of the left ventricular endocardial border during echocardiography.In animal models the acoustic properties of activated DEFINITY were established at or below mechanical index of 0.7 (1.8 MHz frequency). In clinical trials, the majority of the patients were imaged at or below mechanical index of 0.8.. 12.3Pharmacokinetics. Human pharmacokinetics information is not available for the intact or degassed lipid microspheres. The pharmacokinetics of octafluoropropane gas (OFP) was evaluated in healthy subjects (n=8) after the intravenous administration of activated DEFINITY at 50 microL/kg dose.. DistributionOFP gas binding to plasma proteins or partitioning into blood cells has not been studied. However, OFP protein binding is expected to be minimal due to its low partition coefficient into whole blood.. MetabolismOFP is stable gas that is not metabolized. The phospholipid components of the microspheres are thought to be metabolized to free fatty acids.. EliminationOFP was not detectable after 10 minutes in most subjects either in the blood or in expired air. OFP concentrations in blood were shown to decline in mono-exponential fashion with mean half-life of 1.3 minutes in healthy subjects.. Special PopulationsThe pharmacokinetics of octafluoropropane gas (OFP) was evaluated in subjects (n=11) with chronic obstructive pulmonary disease (COPD). The mean half-life of OFP in blood was 1.9 minutes. The total lung clearance of OFP was similar to that in healthy subjects.The pharmacokinetics of activated DEFINITY RT has not been studied in subjects with hepatic diseases or congestive heart failure.

CLINICAL STUDIES SECTION.

14CLINICAL STUDIES. 14.1 Echocardiography. total of 249 subjects were evaluated in clinical trials (208 received activated DEFINITY and 41 placebo). In this group, 154 (61.8%) were male and 95 (38.2%) were female; 183 (73.5%) were White, 38 (15.3%) were Black, 21 (8.4%) were Hispanic, and (2.8%) were classified as other racial or ethnic groups. The mean age was 53.9 years (range 18 to 87).Activated DEFINITY was evaluated in four controlled clinical trials: Two open-label baseline controlled, unpaired blinded image evaluation studies and two identical placebo-controlled, unpaired blinded image evaluation studies. Subjects were eligible for these studies if they had two or more (of six) non-evaluable segments in either the apical 2- or 4-chamber view in non-contrast fundamental echocardiography.In the baseline controlled studies, total of 126 (67 in study and 59 in study B) subjects received bolus dose of 10 microL/kg activated DEFINITY. The outcome measures in these studies included the blinded assessment of ejection fraction (EF), endocardial border length (EBL) obtained by direct measurement, and qualitative assessment of wall motion.In the two placebo-controlled studies total of 123 subjects were randomized in 1:2 ratio to receive two intravenous bolus doses of either 0.9% Sodium Chloride Injection, USP (placebo) or activated DEFINITY 10 microL/kg (17 placebo vs. 33 activated DEFINITY patients and 24 placebo vs. 49 activated DEFINITY patients, respectively). The outcome measure for assessing the effectiveness of activated DEFINITY was the blinded assessment of improvement in ventricular chamber enhancement (measured by videodensitometry at end-diastole and end-systole).. Endocardial Border LengthAs shown in Table 3, compared to baseline, single bolus dose of 10 microL/kg of activated DEFINITY increased the length of endocardial border that could be measured at both end-systole and end-diastole. The mean change in border length from baseline at end-diastole was statistically significant for all readers in the apical 4-chamber view and for out of readers for the apical 2-chamber view. The mean change in border length from baseline at end-systole was statistically significant for out of readers for the apical 4-chamber view and for out of readers for the apical 2-chamber view.. Ventricular Chamber EnhancementLeft ventricular chamber enhancement after an activated DEFINITY dose of 10 microL/kg was significantly increased from baseline compared to placebo in both views at the mid-ventricular and apical levels at end-diastole. Similar results were noted at end-systole, with the exception of the 4-chamber view.. Wall MotionIn retrospective analysis, in subset of subjects (n=12 to 47, depending on reader) having at least adjacent segments non-evaluable on non-contrast imaging, activated DEFINITY converted baseline non-evaluable image to an evaluable image in 58 to 91% of the patients, depending on the reader. In the converted images, the accuracy of wall motion (i.e., normal versus abnormal) improved in 42 to 71% of the patients, depending on the reader, however, improvement in the specific diagnostic accuracy (e.g., hypokinetic, akinetic etc.) was not established. Also, in 13 to 37% of the patients, depending on the reader, activated DEFINITY was found to obscure the wall motion rendering the image non-evaluable.. Ejection FractionIn the baseline controlled studies, ejection fraction results were evaluated in comparison to MRI. The results were evaluated by blinded, independent radiologists. In these studies, although there was statistically significant increase in ventricular chamber enhancement, activated DEFINITY did not significantly improve the assessment of ejection fraction compared to the baseline images.Table 3MEAN (SD) ENDOCARDIAL BORDER LENGTH (CM) BY BOTH APICAL 2- AND 4-CHAMBER VIEWS AT END-SYSTOLE AND END-DIASTOLE BY STUDY, EVALUABLE SUBJECTSStudy/ViewEndocardial Border Length Blinded ReadMean(SD) at End-DiastoleMean(SD) at End-SystoleReader 1Reader 2Reader 1Reader 2Activated DEFINITY Bolus Dose 10 uL/kgStudy A: (N 67)Apical 2-chamber Baseline 8.0(3.4)4.7(2.8) 7.1(3.3) 4.3(2.6) Post-DEFINITY12.8(5.2)Significant change from baseline (paired t-test, p<0.05) 5.8(2.6) 10.6(5.0) 4.4(2.3)Apical 4-chamber Baseline 8.1(3.3)4.5(2.6) 7.6(3.2)4.5(2.7) Post-DEFINITY13.5(5.2) 6.8(3.3) 11.5(4.4) 5.3(3.1)Study B: (N 59)Apical 2-chamber Baseline 4.3(2.6)7.8(5.3)4.1(2.4) 6.5(5.1) Post-DEFINITY5.7(4.7) 8.2(6.5)5.5(4.4) 6.9(6.3)Apical 4-chamber Baseline4.0(2.7) 9.2(5.9)3.8(2.6)7.3(5.6) Post-DEFINITY7.1(5.5) 11.5(7.5) 5.9(5.3) 8.7(6.3) In an open administration, crossover trial, 64 patients were randomized to receive both bolus (10 microL/kg) and infusion (1.3 mL activated DEFINITY in 50 mL 0.9% Sodium Chloride Injection, USP at the rate of mL/min) dosing of activated DEFINITY. Outcome measures for this study included clinically useful ventricular cavity enhancement and endocardial border length. Similar results were seen as described above.Optimal activated DEFINITY doses and device settings for harmonic imaging have not been established.. 14.2Pulmonary Hemodynamic Effects. The impact of DEFINITY on pulmonary hemodynamics was explored in prospective, open-label study of patients with normal (<= 35 mmHg, 16 patients) and elevated (> 35 mmHg, <= 75 mmHg, 16 patients) pulmonary artery systolic pressure undergoing right heart catheterization. Patients with pulmonary artery systolic pressure greater than 75 mmHg were excluded from this study. Systemic hemodynamic parameters and ECGs were also evaluated. No clinically important pulmonary hemodynamic, systemic hemodynamic, or ECG changes were observed. This study did not assess the effect of DEFINITY on visualization of cardiac or pulmonary structures.

CLINICAL TRIALS EXPERIENCE SECTION.

6.1Clinical Trials Experience. Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.A total of 1716 subjects were evaluated in pre-market clinical trials of activated DEFINITY. In this group, 1063 (61.9%) were male and 653 (38.1%) were female, 1328 (77.4%) were White, 258 (15.0%) were Black, 74 (4.3%) were Hispanic, and 56 (3.3%) were classified as other racial or ethnic groups. The mean age was 56.1 years (range 18 to 93). Of these, 144 (8.4%) had at least one adverse reaction (Table 1). There were 26 serious adverse events and 15 (0.9%) subjects discontinued because of an adverse event.. Serious Adverse ReactionsAmong the 1716 study patients, 19 (1.1%) suffered serious cardiopulmonary adverse reactions.For all adverse reactions, the overall incidence of adverse experiences was similar for the <65 year age group and the 65 year age group, similar in males and in females, similar among all racial or ethnic groups, and similar for bolus and infusion dosing. Table summarizes the most common adverse reactions.Table 1New-Onset Adverse Reactions Occurring in >=0.5% of All DEFINITY-Treated SubjectsN=Sample size 1716 subjects who received activated DEFINITYn=Number of subjects reporting at least one Adverse ReactionDEFINITY (N=1716)Total Number of Adverse Reactions269Total Number of Subjects with an Adverse Reaction144(8.4%)Body system Preferred termn(%)Application Site Disorders11(0.6) Injection Site Reactions11(0.6)Body as Whole41(2.4) Back/renal pain20(1.2) Chest pain13(0.8)Central and peripheral nervous system disorder54(3.1) Headache40(2.3) Dizziness11(0.6)Gastrointestinal system31(1.8) Nausea17(1.0)Vascular (extracardiac) disorders19(1.1) Flushing19(1.1)Other adverse reactions that occurred in <=0.5% of the activated DEFINITY-dosed subjects were:Body as Whole: Fatigue, fever, hot flushes, pain, rigors, and syncopeCardiovascular: Abnormal ECGs, bradycardia, tachycardia, palpitation, hypertension and hypotensionDigestive: Dyspepsia, dry mouth, tongue disorder, toothache, abdominal pain, diarrhea and vomitingHematology: Granulocytosis, leukocytosis, leukopenia, and eosinophiliaMusculoskeletal: ArthralgiaNervous System: Leg cramps, hypertonia, vertigo and paresthesiaPlatelet, Bleeding, and Clotting: HematomaRespiratory: Coughing, hypoxia, pharyngitis, rhinitis and dyspneaSpecial Senses: Decreased hearing, conjunctivitis, abnormal vision and taste perversionSkin: Pruritus, rash, erythematous rash, urticaria, increased sweating, and dry skinUrinary: Albuminuria.

CONTRAINDICATIONS SECTION.

4 CONTRAINDICATIONS. Do not administer DEFINITY RT to patients with known or suspected:Hypersensitivity to perflutren lipid microsphere or its components, such as polyethylene glycol (PEG) [see Warnings and Precautions (5.2) and Description (11) ].. Hypersensitivity to perflutren lipid microsphere or its components, such as polyethylene glycol (PEG) [see Warnings and Precautions (5.2) and Description (11) ].. Do not administer DEFINITY RT to patients with known or suspected: Hypersensitivity to perflutren lipid microsphere or its components, such as polyethylene glycol (PEG) (4).

DESCRIPTION SECTION.

11DESCRIPTION. DEFINITY RT (Perflutren Lipid Microsphere) Injectable Suspension is an ultrasound contrast agent. The DEFINITY RT vial contains components that upon activation and dilution yield perflutren lipid microspheres. The unactivated vial contains colorless, uniformly clear to translucent (hazy), viscous, sterile, non-pyrogenic solution, which upon activation with the aid of VIALMIX RFID and dilution with 0.9% Sodium Chloride Injection, USP, provides homogeneous, hypertonic, milky white injectable suspension of perflutren lipid microspheres. The suspension of activated DEFINITY RT is administered by intravenous injection.The perflutren lipid microspheres are composed of octafluoropropane encapsulated in an outer lipid shell consisting of (R) hexadecanoic acid, 1-[(phosphonoxy)methyl]-1,2-ethanediyl ester, monosodium salt (abbreviated DPPA); (R) 4-hydroxy-N,N,N-trimethyl-10-oxo-7-[(1-oxohexadecyl)oxy]-3,4,9-trioxa-4-phosphapentacosan-1-aminium, 4-oxide, inner salt (abbreviated DPPC); and (R)--[6-hydroxy-6-oxido-9-[(1-oxohexadecyl)oxy]-5,7,11-trioxa-2-aza-6-phosphahexacos-1-yl]- -methoxypoly(ox-1,2-ethanediyl), monosodium salt; commonly called N-(methoxypolyethylene glycol 5000 carbamoyl)-1,2-dipalmitoyl-sn-glycero-3- phosphatidylethanolamine, monosodium salt (abbreviated MPEG5000 DPPE).Octafluoropropane is chemically characterized as 1,1,1,2,2,3,3,3-octafluoropropane. It has molecular weight of 188, empirical formula of C3F8 and has the following structural formula:DPPA has molecular weight of 670, empirical formula of C35H68O8PNa, and following structural formula:DPPC has molecular weight of 734, empirical formula of C40H80NO8P, and following structural formula:MPEG5000 DPPE has an approximate molecular weight of 5750 represented by empirical formula C265H527NO123PNa, contains <100ppm Ca2+ and the following structural formula:Prior to activation, the DEFINITY RT vial contains 6.52 mg/mL octafluoropropane in the headspace which is confirmed by positive IR spectroscopic testing in every vial. Each mL of the viscous solution contains 3.75 mg lipid blend (consisting of 0.225 mg DPPA, 2.005 mg DPPC, and 1.520 mg MPEG5000 DPPE), 517.5 mg propylene glycol, 631 mg glycerin, 0.370 mg anhydrous sodium acetate, and 0.030 mg glacial acetic acid. The pH is 5.2 to 6.4. DEFINITY RT does not contain bacterial preservative.After activating the contents of the vial in VIALMIX RFID and diluting with 1.4 mL of preservative-free 0.9% Sodium Chloride, Injection, USP, each mL of the milky white suspension contains 0.045 mg DPPA, 0.401 mg DPPC, 0.304 mg MPEG5000 DPPE, 0.074 mg anhydrous sodium acetate, 0.006 mg glacial acetic acid, maximum of 1.2 1010 perflutren lipid microspheres, and about 80 microL/mL (0.65 mg/mL) octafluoropropane. The microsphere particle size parameters are listed in Table below:Table 2Microsphere Size DistributionMicrosphere particle size parametersMean diameter range1.1 um 3.3 umPercent less than 10 um98%Maximum diameter20 um. Chemical Structure. Chemical Structure. Chemical Structure. Chemical Structure.

DOSAGE & ADMINISTRATION SECTION.

2 DOSAGE AND ADMINISTRATION. DEFINITY RT may be injected by either an intravenous bolus or infusion. The maximum dose is either two bolus doses or one single intravenous infusion. (2.1)The recommended bolus dose for activated DEFINITY RT is 10 microliters (microL)/kg of the activated product by intravenous bolus injection within 30 to 60 seconds, followed by 10 mL 0.9% Sodium Chloride Injection, USP flush. If necessary, second 10 microliters (microL)/kg dose followed by second 10 mL 0.9% Sodium Chloride Injection, USP flush may be administered 30 minutes after the first injection to prolong contrast enhancement. (2.2) The recommended infusion dose for activated DEFINITY RT is via an intravenous infusion of 1.3 mL added to 50 mL of preservative-free 0.9% Sodium Chloride Injection, USP. The rate of infusion should be initiated at mL/minute, but titrated as necessary to achieve optimal image enhancement, not to exceed 10 mL/minute. (2.2)See Full Prescribing Information for instructions on preparation and administration.. 2.1Important Administration Instructions. DEFINITY RT is intended for administration only after activation in the VIALMIX RFID apparatus. Before injection, this product must be activated, diluted, and prepared according to the instructions outlined below. The VIALMIX RFID apparatus should be ordered from Lantheus Medical Imaging, 331 Treble Cove Road, North Billerica, MA, 01862. For customer orders call 1-800-299-3431.13mm ViaLok (packaged separately) must be used in the dilution process of Definity RT.DEFINITY RT may be injected by either an intravenous bolus or infusion. Do not administer DEFINITY RT by intra-arterial injection [see Warnings and Precautions (5.3)].The maximum dose is either two bolus doses or one single intravenous infusion. The safety of bolus and infusion dosing in combination or in sequence, has not been studied.. DEFINITY RT is intended for administration only after activation in the VIALMIX RFID apparatus. Before injection, this product must be activated, diluted, and prepared according to the instructions outlined below. The VIALMIX RFID apparatus should be ordered from Lantheus Medical Imaging, 331 Treble Cove Road, North Billerica, MA, 01862. For customer orders call 1-800-299-3431.. 13mm ViaLok (packaged separately) must be used in the dilution process of Definity RT.. DEFINITY RT may be injected by either an intravenous bolus or infusion. Do not administer DEFINITY RT by intra-arterial injection [see Warnings and Precautions (5.3)].. The maximum dose is either two bolus doses or one single intravenous infusion. The safety of bolus and infusion dosing in combination or in sequence, has not been studied.. 2.2Dosage. BolusThe recommended bolus dose for activated DEFINITY RT is 10 microliters (microL)/kg of the activated product by intravenous bolus injection within 30 to 60 seconds, followed by 10 mL 0.9% Sodium Chloride Injection, USP flush. If necessary, second 10 microliters (microL)/kg dose followed by second 10 mL 0.9% Sodium Chloride Injection, USP flush may be administered 30 minutes after the first injection to prolong contrast enhancement.. InfusionThe recommended infusion dose for activated DEFINITY RT is via an intravenous infusion of 1.3 mL added to 50 mL of preservative-free 0.9% Sodium Chloride Injection, USP. The rate of infusion should be initiated at mL/minute, but titrated as necessary to achieve optimal image enhancement, not to exceed 10 mL/minute.. 2.3Imaging Guidelines. After baseline non-contrast echocardiography is completed, set the mechanical index for the ultrasound device at 0.8 or below [see Warnings and Precautions (5.4)]. Then inject activated DEFINITY RT (as described above) and begin ultrasound imaging immediately. Evaluate the activated DEFINITY RT echocardiogram images in combination with the non-contrast echocardiogram images.In crossover trial of 64 patients randomized to both bolus and infusion using DEFINITY, the duration of clinically useful contrast enhancement for fundamental imaging was approximately 3.4 minutes after 10 microL/kg bolus and was approximately 7.1 minutes during the continuous infusion of 1.3 mL activated DEFINITY in 50 mL 0.9% Sodium Chloride Injection, USP at rate of mL/min.. 2.4DEFINITY RT Activation, Preparation and Handling Instructions. There are two formulations of perflutren lipid microspheres that have differences concerning storage and preparation. Follow the preparation and storage procedures, as well as directions for activation of DEFINITY RT carefully and adhere to strict aseptic procedures during preparation.Activate DEFINITY RT by shaking the vial for 45 seconds using VIALMIX RFID device. Note: illustrations of this procedure are contained in the VIALMIX RFID Users Guide. Do not use this drug unless it has completed full 45 second activation cycle in the VIALMIX RFID. DEFINITY RT will not be properly activated unless the full 45 second activation cycle is completed. Error messages will display if the vial is not properly activated. Do not reactivate the vial if VIALMIX RFID did not properly activate the vial. Never reactivate successfully activated DEFINITY RT vial (see step 2). VIALMIX RFID that is not functioning properly must never be used. Only use vial activated from properly functioning VIALMIX RFID. Refer to the VIALMIX RFID Users Guide to ensure that properly functioning VIALMIX RFID is used.Immediately after VIALMIX RFID activation, but no more than 15 minutes, place the activated vial in the upright position and remove the flip top cap. Insert the 13mm ViaLok (Vented Vial Access Device) into the center of the rubber stopper and push down until properly engaged and locked onto the vial.Obtain syringe containing 1.4 mL preservative-free 0.9% Sodium Chloride Injection, USP.Attach the syringe containing 1.4 mL preservative-free 0.9% Sodium Chloride Injection, USP to the 13mm ViaLok luer-lok hub. Add 1.4 mL of preservative-free 0.9% Sodium Chloride Injection, USP to the activated DEFINITY RT vial. Do not inject air into the DEFINITY RT vial.With the 13mm ViaLok still inserted and syringe attached, rapidly swirl the upright vial for 10 seconds to mix the contents. Activated and diluted DEFINITY RT appears as milky white homogenous suspension with presence of foam/bubbles.The product must be used within minutes of dilution. If not used within minutes the microspheres should be resuspended by rapidly swirling the upright vial for 10 seconds before the product is withdrawn in syringe.The activated DEFINITY RT may be used for up to hours from the time of dilution, with the 13mm ViaLok still attached, but only after the microspheres are resuspended by rapidly swirling the upright vial for 10 seconds.If not used immediately, the activated, diluted DEFINITY RT can be stored at room temperature 20 to 25C (68 to 77F) in the original product vial with the 13mm ViaLok still attached for up to hours. sterile syringe or cap should be attached to the Luer fitting on the ViaLok until use.Invert the vial and withdraw the activated milky white suspension through the 13mm ViaLok into the syringe. Do not inject air into the DEFINITY RT vial.Use the product immediately after its withdrawal from the vial; do not allow the product to stand in the syringe.For bolus dosing, withdraw appropriate volume based on patient weight (kg) for administration. For infusion dosing, dilute 1.3 mL Definity RT in 50 mL of preservative-free 0.9% Sodium Chloride Injection, USP. [see Dosage 2.2]. Activate DEFINITY RT by shaking the vial for 45 seconds using VIALMIX RFID device. Note: illustrations of this procedure are contained in the VIALMIX RFID Users Guide. Do not use this drug unless it has completed full 45 second activation cycle in the VIALMIX RFID. DEFINITY RT will not be properly activated unless the full 45 second activation cycle is completed. Error messages will display if the vial is not properly activated. Do not reactivate the vial if VIALMIX RFID did not properly activate the vial. Never reactivate successfully activated DEFINITY RT vial (see step 2). VIALMIX RFID that is not functioning properly must never be used. Only use vial activated from properly functioning VIALMIX RFID. Refer to the VIALMIX RFID Users Guide to ensure that properly functioning VIALMIX RFID is used.. Immediately after VIALMIX RFID activation, but no more than 15 minutes, place the activated vial in the upright position and remove the flip top cap. Insert the 13mm ViaLok (Vented Vial Access Device) into the center of the rubber stopper and push down until properly engaged and locked onto the vial.. Obtain syringe containing 1.4 mL preservative-free 0.9% Sodium Chloride Injection, USP.. Attach the syringe containing 1.4 mL preservative-free 0.9% Sodium Chloride Injection, USP to the 13mm ViaLok luer-lok hub. Add 1.4 mL of preservative-free 0.9% Sodium Chloride Injection, USP to the activated DEFINITY RT vial. Do not inject air into the DEFINITY RT vial.. With the 13mm ViaLok still inserted and syringe attached, rapidly swirl the upright vial for 10 seconds to mix the contents. Activated and diluted DEFINITY RT appears as milky white homogenous suspension with presence of foam/bubbles.. The product must be used within minutes of dilution. If not used within minutes the microspheres should be resuspended by rapidly swirling the upright vial for 10 seconds before the product is withdrawn in syringe.. The activated DEFINITY RT may be used for up to hours from the time of dilution, with the 13mm ViaLok still attached, but only after the microspheres are resuspended by rapidly swirling the upright vial for 10 seconds.. If not used immediately, the activated, diluted DEFINITY RT can be stored at room temperature 20 to 25C (68 to 77F) in the original product vial with the 13mm ViaLok still attached for up to hours. sterile syringe or cap should be attached to the Luer fitting on the ViaLok until use.. Invert the vial and withdraw the activated milky white suspension through the 13mm ViaLok into the syringe. Do not inject air into the DEFINITY RT vial.. Use the product immediately after its withdrawal from the vial; do not allow the product to stand in the syringe.. For bolus dosing, withdraw appropriate volume based on patient weight (kg) for administration. For infusion dosing, dilute 1.3 mL Definity RT in 50 mL of preservative-free 0.9% Sodium Chloride Injection, USP. [see Dosage 2.2]. Special Instructions for the DEFINITY RT Radio Frequency Identification (RFID)-Tagged VialFull instructions for use of VIALMIX RFID are provided on the VIALMIX RFID screen and Users Guide.The RFID tag allows for the exchange of product information such as activation time and activation rate.VIALMIX RFID will only activate DEFINITY and DEFINITY RT RFID-tagged vials. Function of the RFID technology is not dependent on vial orientation as it is placed in the VIALMIX RFID. If the RFID tag is damaged or otherwise non-functional, the VIALMIX RFID will notify the user and the vial with the nonfunctional RFID tag cannot be used to activate DEFINITY RT with VIALMIX RFID. Discard the nonfunctional RFID-tagged DEFINITY RT vial.Follow all manufacturers guidelines and do not operate any part of the VIALMIX RFID with DEFINITY RT RFID-tagged vials within inches (15 cm) of pacemaker and/or defibrillator.. The RFID tag allows for the exchange of product information such as activation time and activation rate.. VIALMIX RFID will only activate DEFINITY and DEFINITY RT RFID-tagged vials. Function of the RFID technology is not dependent on vial orientation as it is placed in the VIALMIX RFID. If the RFID tag is damaged or otherwise non-functional, the VIALMIX RFID will notify the user and the vial with the nonfunctional RFID tag cannot be used to activate DEFINITY RT with VIALMIX RFID. Discard the nonfunctional RFID-tagged DEFINITY RT vial.. Follow all manufacturers guidelines and do not operate any part of the VIALMIX RFID with DEFINITY RT RFID-tagged vials within inches (15 cm) of pacemaker and/or defibrillator.

DOSAGE FORMS & STRENGTHS SECTION.

3 DOSAGE FORMS AND STRENGTHS. DEFINITY RT is supplied as single patient use mL RFID-tagged clear glass vial containing colorless, uniformly clear to translucent (hazy) viscous solution in packages of twenty (20) single patient use vials.Prior to activation, the headspace of each vial contains 6.52 mg/mL octafluoropropane and the viscous solution contains 3.75 mg/mL of lipid blend. After activation and dilution with 0.9% Sodium Chloride Injection, USP, each vial contains maximum of 1.2 1010 perflutren lipid microspheres, and about 80 microL/mL (0.65 mg/mL) octafluoropropane [see Description (11)].. DEFINITY RT is supplied as single patient use mL RFID-tagged clear glass vial containing colorless, uniformly clear to translucent (hazy) viscous solution in packages of twenty (20) single patient use vials. (3).

GERIATRIC USE SECTION.

8.5Geriatric Use. In clinical trials, the overall incidence of adverse reactions was similar for the <65 year age group and the >=65 year age group. Of the total number of subjects in clinical trials of DEFINITY, 144 (33%) were 65 and over. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.

HOW SUPPLIED SECTION.

16HOW SUPPLIED/STORAGE AND HANDLING. 16.1How Supplied. DEFINITY RT is supplied as single patient use mL clear glass Radio Frequency Identification (RFID)-tagged vial containing colorless, uniformly clear to translucent (hazy) viscous solution in packages of twenty (20) single patient use vials.One (1) mL RFID-tagged vial NDC (11994-017-01)Twenty (20) mL RFID-tagged vials per kit NDC (11994-017-20). One (1) mL RFID-tagged vial NDC (11994-017-01). Twenty (20) mL RFID-tagged vials per kit NDC (11994-017-20). 16.2Storage and Handling. Store at Room Temperature 20 to 25C (68 to 77F); excursions permitted between 15 to 30C (59 to 86F) [see USP Controlled Room Temperature].Regarding interference with medical devices, the RFID tag and VIALMIX RFID unit meets the IEC 60601-1-2 requirements for emission and immunity standards for medical devices.

INDICATIONS & USAGE SECTION.

1 INDICATIONS AND USAGE. Activated DEFINITY RT (Perflutren Lipid Microsphere) Injectable Suspension is indicated for use in patients with suboptimal echocardiograms to opacify the left ventricular chamber and to improve the delineation of the left ventricular endocardial border.. DEFINITY RT is an ultrasound contrast agent indicated for use in patients with suboptimal echocardiograms to opacify the left ventricular chamber and to improve the delineation of the left ventricular endocardial border. (1).

INFORMATION FOR PATIENTS SECTION.

17PATIENT COUNSELING INFORMATION. Advise patients to inform their healthcare provider if they develop any symptoms of hypersensitivity after DEFINITY RT administration, including rash, wheezing, or shortness of breath.

LACTATION SECTION.

8.2Lactation. Risk SummaryThere are no data on the presence of DEFINITY in human milk, the effects on the breastfed infant, or the effects on milk production. The developmental and health benefits of breastfeeding should be considered along with the mothers clinical need for DEFINITY RT and any potential adverse effects on the breastfed infant from DEFINITY RT or from the underlying maternal condition.

MECHANISM OF ACTION SECTION.

12.1Mechanism of Action. Perflutren lipid microspheres exhibit lower acoustic impedance than blood and enhance the intrinsic backscatter of blood. These physical acoustic properties of activated DEFINITY RT provide contrast enhancement of the left ventricular chamber and aid delineation of the left ventricular endocardial border during echocardiography.In animal models the acoustic properties of activated DEFINITY were established at or below mechanical index of 0.7 (1.8 MHz frequency). In clinical trials, the majority of the patients were imaged at or below mechanical index of 0.8.

NONCLINICAL TOXICOLOGY SECTION.

13NONCLINICAL TOXICOLOGY. 13.1Carcinogenesis, Mutagenesis, and Impairment of Fertility. Studies with activated DEFINITY have not been performed to evaluate carcinogenic potential. Evidence of genotoxicity was not found in the following studies with activated DEFINITY: 1) bacterial mutagenesis assay (Ames assay), 2) in vitro mammalian mutagenesis assay, 3) in vitro human lymphocyte chromosome aberration assay, and 4) in vivo rat micronucleus assay.Impairment of male or female fertility was not observed in rats and rabbits treated with activated DEFINITY at doses up to 24 and 15 times the human dose based on body surface area (in rats and rabbits respectively).

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL.

PRINCIPAL DISPLAY PANEL 2 mL Vial Carton. DEFINITY(R) RT (Perflutren Lipid Microsphere) INJECTABLE SUSPENSIONNDC 11994-017-20 STERILE20x2 mL vialsNon-PyrogenicFor Intravenous Use Only Must Activate and Dilute with 1.4 mL of0.9% Sodium Chloride Injection, USP Prior to UseUse the 13mm ViaLok(R) (Vented Vial Access Device) (packaged separately) during dilution and withdrawal of DEFINITY(R) RTStore at Room Temperature 20 to 25C (68 to 77F)Single Patient Use. Discard Unused Portion.CONTAINS NO BACTERIOSTATIC PRESERVATIVELantheus Medical Imaging(R) Rx Only. PRINCIPAL DISPLAY PANEL 2 mL Vial Carton.

PEDIATRIC USE SECTION.

8.4Pediatric Use. The safety and effectiveness of activated DEFINITY RT have not been established in the pediatric population.The safety of injecting activated DEFINITY RT in neonates and infants with immature pulmonary vasculature has not been studied.The pharmacokinetics of activated DEFINITY RT in pediatric subjects has not been studied.

PHARMACOKINETICS SECTION.

12.3Pharmacokinetics. Human pharmacokinetics information is not available for the intact or degassed lipid microspheres. The pharmacokinetics of octafluoropropane gas (OFP) was evaluated in healthy subjects (n=8) after the intravenous administration of activated DEFINITY at 50 microL/kg dose.. DistributionOFP gas binding to plasma proteins or partitioning into blood cells has not been studied. However, OFP protein binding is expected to be minimal due to its low partition coefficient into whole blood.. MetabolismOFP is stable gas that is not metabolized. The phospholipid components of the microspheres are thought to be metabolized to free fatty acids.. EliminationOFP was not detectable after 10 minutes in most subjects either in the blood or in expired air. OFP concentrations in blood were shown to decline in mono-exponential fashion with mean half-life of 1.3 minutes in healthy subjects.. Special PopulationsThe pharmacokinetics of octafluoropropane gas (OFP) was evaluated in subjects (n=11) with chronic obstructive pulmonary disease (COPD). The mean half-life of OFP in blood was 1.9 minutes. The total lung clearance of OFP was similar to that in healthy subjects.The pharmacokinetics of activated DEFINITY RT has not been studied in subjects with hepatic diseases or congestive heart failure.

POSTMARKETING EXPERIENCE SECTION.

6.2Postmarketing Experience. In prospective, multicenter, open-label registry of 1053 patients receiving DEFINITY in routine clinical practice, heart rate, respiratory rate, and pulse oximetry were monitored for 30 minutes after DEFINITY administration. No deaths or serious adverse reactions were reported, suggesting that these reactions are unlikely to occur at rate of more than 0.3% when DEFINITY is used according to recommendations.The following adverse reactions have been identified during the post-marketing use of perflutren and PEG-containing microsphere products. Because these reactions are reported voluntarily from population of uncertain size, it is not always possible to reliably estimate their frequency or establish causal relationship to drug exposure.Fatal cardiopulmonary and hypersensitivity reactions and other serious but non-fatal adverse reactions were uncommonly reported. These reactions typically occurred within 30 minutes of DEFINITY administration. These serious reactions may be increased among patients with pre-existing PEG hypersensitivity and/or unstable cardiopulmonary conditions (acute myocardial infarction, acute coronary artery syndromes, worsening or unstable congestive heart failure, or serious ventricular arrhythmias [see Warnings and Precautions (5.1, 5.2)] Reported reactions included:. CardiopulmonaryFatal cardiac or respiratory arrest, shock, syncope, symptomatic arrhythmias (atrial fibrillation, tachycardia, bradycardia, supraventricular tachycardia, ventricular fibrillation, ventricular tachycardia), hypertension, hypotension, dyspnea, hypoxia, chest pain, respiratory distress, stridor, wheezing.. HypersensitivityAnaphylaxis, with manifestations that may include death, shock, bronchospasm, throat tightness, angioedema, edema (pharyngeal, palatal, mouth, peripheral, localized), swelling (face, eye, lip, tongue, upper airway), facial hypoesthesia, rash, urticaria, pruritus, flushing, and erythema.. NeurologicComa, loss of consciousness, convulsion, seizure, transient ischemic attack, agitation, tremor, vision blurred, dizziness, headache, fatigue.

PREGNANCY SECTION.

8.1Pregnancy. Risk SummaryAvailable data from case reports with DEFINITY use in pregnant women have not identified drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes. DEFINITY RT has very short half-life; therefore, administration of DEFINITY RT to pregnant woman is not expected to result in clinically relevant fetal exposure. No adverse developmental outcomes were observed in animal reproduction studies with administration of activated DEFINITY in pregnant rats and rabbits during organogenesis at doses up to and 16 times, respectively, the maximum human dose based on body surface area (see Data).All pregnancies have background risk of birth defects, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.. Data. Animal DataDEFINITY was administered intravenously to rats at doses of 0.1, 0.3, and 1.0 mL/kg (approximately 0.8, 2.4, and times the recommended maximum human dose based on body surface area); DEFINITY doses were administered daily from day to day 17 of gestation. DEFINITY was administered intravenously to rabbits at doses of 0.1, 0.3, and 1.0 mL/kg (approximately, 1.6, 4.8, and 16 times the recommended maximum human dose based on body surface area); DEFINITY doses were administered daily from day to day 19 of gestation. No significant findings on the fetus were observed.

RECENT MAJOR CHANGES SECTION.

Contraindications (4)4/2021Warnings and Precautions (5.2)4/2021.

SPL UNCLASSIFIED SECTION.

2.1Important Administration Instructions. DEFINITY RT is intended for administration only after activation in the VIALMIX RFID apparatus. Before injection, this product must be activated, diluted, and prepared according to the instructions outlined below. The VIALMIX RFID apparatus should be ordered from Lantheus Medical Imaging, 331 Treble Cove Road, North Billerica, MA, 01862. For customer orders call 1-800-299-3431.13mm ViaLok (packaged separately) must be used in the dilution process of Definity RT.DEFINITY RT may be injected by either an intravenous bolus or infusion. Do not administer DEFINITY RT by intra-arterial injection [see Warnings and Precautions (5.3)].The maximum dose is either two bolus doses or one single intravenous infusion. The safety of bolus and infusion dosing in combination or in sequence, has not been studied.. DEFINITY RT is intended for administration only after activation in the VIALMIX RFID apparatus. Before injection, this product must be activated, diluted, and prepared according to the instructions outlined below. The VIALMIX RFID apparatus should be ordered from Lantheus Medical Imaging, 331 Treble Cove Road, North Billerica, MA, 01862. For customer orders call 1-800-299-3431.. 13mm ViaLok (packaged separately) must be used in the dilution process of Definity RT.. DEFINITY RT may be injected by either an intravenous bolus or infusion. Do not administer DEFINITY RT by intra-arterial injection [see Warnings and Precautions (5.3)].. The maximum dose is either two bolus doses or one single intravenous infusion. The safety of bolus and infusion dosing in combination or in sequence, has not been studied.

STORAGE AND HANDLING SECTION.

16.2Storage and Handling. Store at Room Temperature 20 to 25C (68 to 77F); excursions permitted between 15 to 30C (59 to 86F) [see USP Controlled Room Temperature].Regarding interference with medical devices, the RFID tag and VIALMIX RFID unit meets the IEC 60601-1-2 requirements for emission and immunity standards for medical devices.

USE IN SPECIFIC POPULATIONS SECTION.

8 USE IN SPECIFIC POPULATIONS. 8.1Pregnancy. Risk SummaryAvailable data from case reports with DEFINITY use in pregnant women have not identified drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes. DEFINITY RT has very short half-life; therefore, administration of DEFINITY RT to pregnant woman is not expected to result in clinically relevant fetal exposure. No adverse developmental outcomes were observed in animal reproduction studies with administration of activated DEFINITY in pregnant rats and rabbits during organogenesis at doses up to and 16 times, respectively, the maximum human dose based on body surface area (see Data).All pregnancies have background risk of birth defects, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.. Data. Animal DataDEFINITY was administered intravenously to rats at doses of 0.1, 0.3, and 1.0 mL/kg (approximately 0.8, 2.4, and times the recommended maximum human dose based on body surface area); DEFINITY doses were administered daily from day to day 17 of gestation. DEFINITY was administered intravenously to rabbits at doses of 0.1, 0.3, and 1.0 mL/kg (approximately, 1.6, 4.8, and 16 times the recommended maximum human dose based on body surface area); DEFINITY doses were administered daily from day to day 19 of gestation. No significant findings on the fetus were observed.. 8.2Lactation. Risk SummaryThere are no data on the presence of DEFINITY in human milk, the effects on the breastfed infant, or the effects on milk production. The developmental and health benefits of breastfeeding should be considered along with the mothers clinical need for DEFINITY RT and any potential adverse effects on the breastfed infant from DEFINITY RT or from the underlying maternal condition.. 8.4Pediatric Use. The safety and effectiveness of activated DEFINITY RT have not been established in the pediatric population.The safety of injecting activated DEFINITY RT in neonates and infants with immature pulmonary vasculature has not been studied.The pharmacokinetics of activated DEFINITY RT in pediatric subjects has not been studied.. 8.5Geriatric Use. In clinical trials, the overall incidence of adverse reactions was similar for the <65 year age group and the >=65 year age group. Of the total number of subjects in clinical trials of DEFINITY, 144 (33%) were 65 and over. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.

WARNINGS AND PRECAUTIONS SECTION.

5 WARNINGS AND PRECAUTIONS. Serious cardiopulmonary reactions, including fatalities, have occurred during or following perflutren-containing microsphere administration. (5.1)Serious acute hypersensitivity reactions have occurred in patients with no prior exposure to perflutren-containing microsphere products, including patients with prior hypersensitivity reaction(s) to PEG (5.2, 6).Always have cardiopulmonary resuscitation personnel and equipment readily available prior to DEFINITY RT administration and monitor all patients for acute reactions (5.1, 5.2).. 5.1Serious Cardiopulmonary Reactions. Serious cardiopulmonary reactions including fatalities have occurred uncommonly during or shortly following perflutren-containing microsphere administration, typically within 30 minutes of administration. The risk for these reactions may be increased among patients with unstable cardiopulmonary conditions (acute myocardial infarction, acute coronary artery syndromes, worsening or unstable congestive heart failure, or serious ventricular arrhythmias). Always have cardiopulmonary resuscitation personnel and equipment readily available prior to DEFINITY RT administration and monitor all patients for acute reactions.The reported reactions include: fatal cardiac or respiratory arrest, shock, syncope, symptomatic arrhythmias (atrial fibrillation, tachycardia, bradycardia, supraventricular tachycardia, ventricular fibrillation, ventricular tachycardia), hypertension, hypotension, dyspnea, hypoxia, chest pain, respiratory distress, stridor, wheezing, loss of consciousness, and convulsions [see Adverse Reactions (6)].. 5.2Hypersensitivity Reactions. In postmarketing use, serious hypersensitivity reactions were observed during or shortly following perflutren-containing microsphere administration including:Anaphylaxis, with manifestations that may include death, shock, bronchospasm, throat tightness, angioedema, edema (pharyngeal, palatal, mouth, peripheral, localized), swelling (face, eye, lip, tongue, upper airway), facial hypoesthesia, rash, urticaria, pruritus, flushing, and erythema.These reactions have occurred in patients with no prior exposure to perflutren-containing microsphere products. DEFINITY RT contains PEG. There may be increased risk of serious reactions including death in patients with prior hypersensitivity reaction(s) to PEG [see Adverse Reactions (6.2) and Description (11)]. Clinically assess patients for prior hypersensitivity reactions to products containing PEG, such as certain colonoscopy bowel preparations and laxatives. Always have cardiopulmonary resuscitation personnel and equipment readily available prior to DEFINITY RT administration and monitor all patients for hypersensitivity reactions.. 5.3Systemic Embolization. When administering DEFINITY RT to patients with cardiac shunt, the microspheres can bypass filtering by the lung and enter the arterial circulation. Assess patients with shunts for embolic phenomena following DEFINITY RT administration. DEFINITY RT is only for intravenous administration; do not administer DEFINITY RT by intra-arterial injection [see Dosage and Administration (2.1)].. 5.4Ventricular Arrhythmia Related to High Mechanical Index. High ultrasound mechanical index values may cause microsphere cavitation or rupture and lead to ventricular arrhythmias. Additionally, end-systolic triggering with high mechanical indices has been reported to cause ventricular arrhythmias. DEFINITY RT is not recommended for use at mechanical indices greater than 0.8 [see Dosage and Administration (2)].