CLINICAL PHARMACOLOGY SECTION.

CLINICAL PHARMACOLOGY. When injected intravenously, Technetium Tc 99m Pyrophosphate has specific affinity for areas of altered osteogenesis. It is also concentrated in the injured myocardium, primarily in areas of irreversibly damaged myocardial cells. One to two hours after intravenous injection of Technetium Tc 99m Pyrophosphate, an estimated 40 to 50% of the injected dose had been taken up by the skeleton, and approximately 0.01 to 0.02% per gram of acutely infarcted myocardium. Within period of one hour, 10 to 11% remains in the vascular system, declining to approximately to 3% twenty-four hours post injection. The average urinary excretion was observed to be about 40% of the administered dose after 24 hours. Technescan PYP also has an affinity for red blood cells. When administered 15 to 30 minutes prior to the intravenous administration of sodium pertechnetate Tc 99m (in vivo red blood cell labeling), approximately 75% of the injected radioactivity remains in the blood pool providing excellent images of the cardiac chambers. When the modified in vivo/in vitro red blood cell labeling method is used, comparable percentages of the injected radioactivity are obtained. Toxicology data are available upon request.

DESCRIPTION SECTION.

DESCRIPTION. Technescan(TM) PYP(TM) (Kit for the Preparation of Technetium Tc 99m Pyrophosphate Injection) is sterile, non-pyrogenic, diagnostic radiopharmaceutical suitable for intravenous administration after reconstitution with sterile sodium pertechnetate Tc 99m injection or sterile 0.9% sodium chloride injection. Each 10 milliliter reaction vial contains 11.9 milligrams sodium pyrophosphate, 3.2 milligrams (minimum) stannous chloride (SnCl2o2H2O) and 4.4 milligrams (maximum) total tin expressed as stannous chloride (SnCl2o2H2O) in lyophilized form under an atmosphere of nitrogen. Prior to lyophilization the pH is adjusted with hydrochloric acid. The pH of the reconstituted drug is between 4.5 and 7.5. No bacteriostatic preservative is present. The precise structures of the stannous-pyrophosphate and technetium-stannous-pyrophosphate complexes are not known at this time.

DOSAGE & ADMINISTRATION SECTION.

DOSAGE AND ADMINISTRATION. Bone and Cardiac Imaging. The recommended adult doses of Technetium Tc 99m Pyrophosphate Injection are: Indication Doses asTechnetium Tc 99 Fraction ofVial Contents Required Skeletal Imaging 185 to 555 megabecquerels(5 to 15 mCi) 0.07 to 0.91 Cardiac Imaging 370 to 555 megabecquerels(10 to 15 mCi) 0.26 to 0.45Technetium Tc 99m Pyrophosphate Injection is injected intravenously over 10- to 20-second period. For optimal results, bone imaging should be done one to six hours following administration. Cardiac imaging should be done 60 to 90 minutes following administration. The acute myocardial infarct can be visualized from 24 hours to nine days following onset of symptoms, with maximum localization at 48 to 72 hours. Cardiac imaging should be done with gamma scintillation camera. It is recommended that images be made of the anterior, left anterior oblique and left lateral projections.The patient dose should be measured by suitable radioactivity calibration system immediately prior to administration. It is also recommended that the radiochemical purity be checked prior to administration.. Blood Pool Imaging. The recommended adult dose of Technescan PYP is one-third (0.33) to the entire vial contents, followed by 555 to 740 megabecquerels (15 to 20 millicuries) of sodium pertechnetate Tc 99m. Cardiac imaging should be done 10 minutes following the administration of sodium pertechnetate Tc 99m (in vivo method) or Tc 99m labeled red blood cells (modified in vivo/in vitro method) utilizing scintillation camera interfaced to an electrocardiographic gating device. In Vivo Method: Technescan PYP is reconstituted with sterile, non-pyrogenic normal saline containing no preservatives. The patient dose is administered intravenously 15 to 30 minutes prior to the intravenous administration of 555 to 740 megabecquerels (15 to 20 millicuries) of sodium pertechnetate Tc 99m. Technescan PYP should be injected by direct venipuncture. Heparinized catheter systems should be avoided. Modified In Vivo/In Vitro Method Using Acid-Citrate-Dextrose (ACD): Technescan PYP is reconstituted with sterile, non-pyrogenic normal saline containing no preservatives, and the patient dose is administered intravenously. An intravenous line containing 3-way stopcock is inserted in large peripheral vein and kept patent with continuous drip of sterile, non-pyrogenic normal saline containing no preservatives. Thirty minutes after Technescan PYP injection, the infusion line and stopcock are cleared by withdrawing and discarding approximately milliliters of whole blood. Immediately following, approximately milliliters of whole blood are withdrawn into syringe containing milliliter preservative-free acid-citrate-dextrose (ACD) and 555 to 740 megabecquerels (15 to 20 millicuries) of sodium pertechnetate Tc 99m. The stopcock is then turned, residual blood is flushed from the intravenous line, and the normal saline flow is readjusted. The syringe is gently rotated to mix and allowed to incubate at room temperature for 10 minutes prior to injection via the 3-way stopcock. Modified In Vivo/In Vitro Method Using Heparin: Technescan PYP is reconstituted with sterile, non-pyrogenic normal saline containing no preservatives, and the patient dose is administered intravenously. An infusion set fitted with 3-way stopcock is placed in large peripheral vein, and the intravenous line is heparinized with saline solution containing to 10 units preservative-free heparin per milliliter. Thirty minutes after Technescan PYP injection, milliliters of blood are withdrawn into syringe containing 555 to 740 megabecquerels (15 to 20 millicuries) of sodium pertechnetate Tc 99m. Anticoagulation of the blood is provided by residual heparin in the intravenous line. The syringe is gently rotated to mix and allowed to incubate at room temperature for 10 minutes prior to injection via the 3-way stopcock. Parenteral drug products should be visually inspected for particulate matter and discoloration prior to administration whenever solution and container permit. Do not use if contents are turbid.

GENERAL PRECAUTIONS SECTION.

General. Technescan PYP should not be used more than six hours after preparation. The components of the kit are sterile and non-pyrogenic. It is essential that the user follow the directions carefully and adhere to strict aseptic procedures during preparation. The contents of this kit are not radioactive. However, after sodium pertechnetate Tc 99m is added, adequate shielding of the final preparation must be maintained. The imaging of gastrointestinal bleeding is dependent on such factors as the region of imaging, rate and volume of the bleed, efficacy of labeling of the red blood cells and timeliness of imaging. Due to these factors, images should be taken sequentially over period of time until positive image is obtained or clinical conditions warrant the discontinuance of the procedure. The period of time for collecting the images may range up to thirty-six hours. Any sodium pertechnetate Tc 99m solution which contains an oxidizing agent is not suitable for use in the preparation of Technetium Tc 99m Pyrophosphate Injection. The contents of the Technescan PYP reaction vial may be used for the preparation of Technetium Tc 99m Pyrophosphate Injection. Technescan PYP may also be reconstituted with sterile, non-pyrogenic normal saline containing no preservatives and injected intravenously prior to labeling of red blood cells with sodium pertechnetate Tc 99m using either the in vivo or modified in vivo/in vitro method. As in the use of any other radioactive material, care should be taken to ensure minimum radiation exposure to the patient, consistent with proper patient management, and to ensure minimum radiation exposure to occupational workers. Radiopharmaceuticals should be used only by physicians who are qualified by specific training in the safe use and handling of radionuclides produced by nuclear reactor or particle accelerator and whose experience and training have been approved by the appropriate government agency authorized to license the use of radionuclides.

INDICATIONS & USAGE SECTION.

INDICATIONS AND USAGE. Technetium Tc 99m Pyrophosphate Injection is skeletal imaging agent used to demonstrate areas of altered osteogenesis, and cardiac imaging agent used as an adjunct in the diagnosis of acute myocardial infarction. As an adjunct in the diagnosis of confirmed myocardial infarction (ECG and serum enzymes positive), the incidence of false negative images has been found to be 6%. False negative images can also occur if made too early in the evolutionary phase of the infarct or too late in the resolution phase. In limited study involving 22 patients in whom the ECG was positive and serum enzymes questionable or negative, but in whom the final diagnosis of acute myocardial infarction was made, the incidence of false negative images was 23%. The incidence of false positive images has been found to be to 9%. False positive images have been reported following coronary by-pass graft surgery, in unstable angina pectoris, old myocardial infarcts and in cardiac contusions. Technescan PYP is blood pool imaging agent which may be used for gated blood pool imaging and for the detection of sites of gastrointestinal bleeding. When administered intravenously 15 to 30 minutes prior to intravenous administration of sodium pertechnetate Tc 99m for in vivo red blood cell labeling, approximately 75% of the injected activity remains in the blood pool. The modified in vivo/in vitro red blood cell labeling method may also be used for blood pool imaging.

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL.

PRINCIPAL DISPLAY PANEL A094V0. Technescan(TM) PYP(TM)(Stannous Pyrophosphate)Vial contains 11.9 mg Sodium Pyrophosphate, 3.2 mg (minimum) stannous chloride (SnCl2o2H2O) and 4.4 mg (maximum) total tin as stannous chloride (SnCl2o2H2O). Prior to lyophilization the pH is adjusted with hydrochloric acid. The pH of the reconstituted drug is between 4.5 and 7.5. The contents are sealed under nitrogen.Sterile, non-pyrogentic. For Intravenous use after drug preparation. See package insert for directions for use.Do not use Tc 99m solutions containing an oxidizing agent. Rx only Store refrigerated at to 8C (36 to 46F). Manufactured by:Curium US LLCMaryland Heights, MO 63043Made in USACURIUM(TM) A094V0R12/2018. Display Panel A094VO.

PRECAUTIONS SECTION.

PRECAUTIONS. General. Technescan PYP should not be used more than six hours after preparation. The components of the kit are sterile and non-pyrogenic. It is essential that the user follow the directions carefully and adhere to strict aseptic procedures during preparation. The contents of this kit are not radioactive. However, after sodium pertechnetate Tc 99m is added, adequate shielding of the final preparation must be maintained. The imaging of gastrointestinal bleeding is dependent on such factors as the region of imaging, rate and volume of the bleed, efficacy of labeling of the red blood cells and timeliness of imaging. Due to these factors, images should be taken sequentially over period of time until positive image is obtained or clinical conditions warrant the discontinuance of the procedure. The period of time for collecting the images may range up to thirty-six hours. Any sodium pertechnetate Tc 99m solution which contains an oxidizing agent is not suitable for use in the preparation of Technetium Tc 99m Pyrophosphate Injection. The contents of the Technescan PYP reaction vial may be used for the preparation of Technetium Tc 99m Pyrophosphate Injection. Technescan PYP may also be reconstituted with sterile, non-pyrogenic normal saline containing no preservatives and injected intravenously prior to labeling of red blood cells with sodium pertechnetate Tc 99m using either the in vivo or modified in vivo/in vitro method. As in the use of any other radioactive material, care should be taken to ensure minimum radiation exposure to the patient, consistent with proper patient management, and to ensure minimum radiation exposure to occupational workers. Radiopharmaceuticals should be used only by physicians who are qualified by specific training in the safe use and handling of radionuclides produced by nuclear reactor or particle accelerator and whose experience and training have been approved by the appropriate government agency authorized to license the use of radionuclides. Overdosage. In case of overdose of Technetium Tc 99m Pyrophosphate, encourage patients to maintain hydration and to void frequently to minimize radiation exposure.. Bone Imaging. Both prior to and following administration of Technetium Tc 99m Pyrophosphate Injection, patients should be encouraged to drink fluids. Patients should void as often as possible after administration of Technetium Tc 99m Pyrophosphate Injection to minimize background interference from its accumulation in the bladder and to reduce unnecessary exposure to radiation.. Cardiac Imaging. The patients cardiac condition should be stable before beginning the cardiac imaging procedure.If not contraindicated by the cardiac status, patients should be encouraged to ingest fluids and to void frequently in order to reduce unnecessary radiation exposure.Interference from chest wall lesions such as breast tumors and healing rib fractures can be minimized by employing the three recommended projections.. Carcinogenesis, Mutagenesis, Impairment of Fertility. No long term animal studies have been performed to evaluate carcinogenic or mutagenic potential, or whether this drug affects fertility in males or females.. Pregnancy Category C. Animal reproduction studies have not been conducted with Technetium Tc 99m Pyrophosphate Injection. It is also not known whether this drug can cause fetal harm when administered to pregnant woman or can affect reproduction capacity. Technetium Tc 99m Pyrophosphate Injection should be given to pregnant woman only if clearly needed.Ideally, examinations using radiopharmaceuticals, especially those elective in nature, of woman of childbearing capability should be performed during the first few (approximately 10) days following the onset of menses.. Nursing Mothers. Technetium Tc 99m is excreted in human milk during lactation, therefore, formula feedings should be substituted for breast feeding.. Pediatric Use. Safety and effectiveness in pediatric patients have not been established.

SPL UNCLASSIFIED SECTION.

PHYSICAL CHARACTERISTICS. Technetium Tc 99m decays by isomeric transition with physical half-life of 6.02 hours.Kocher, David C., Radioactive Decay Data Tables, DOE/TIC-11026, 108 (1981).The principal photon that is useful for detection and imaging is listed in Table 1. Table 1. Principal Radiation Emission Data Radiation Mean Percent/Disintegration Energy (keV) Gamma-2 89.07 140.5 The specific gamma ray constant for technetium Tc 99m is 0.78 R/mCi-hr at cm. The first half-value thickness of lead (Pb) for technetium Tc 99m is 0.017 cm. range of values for the relative attenuation of the radiation emitted by this radionuclide that results from interposition of various thicknesses of Pb is shown in Table 2. For example, the use of 0.25 cm of Pb will decrease the external radiation exposure by factor of about 1000. Table 2. Radiation Attenuation by Lead Shielding ShieldThickness (Pb) cm Coefficientof Attenuation 0.0170.080.160.250.33 0.510-1 10-2 10-3 10-4 To correct for physical decay of this radionuclide, the fractions that remain at selected time intervals after the time of calibration are shown in Table 3. Table 3. Physical Decay Chart; Technetium Tc 99m, Half-Life 6.02 Hours Calibration Time Hours FractionRemaining Hours FractionRemaining 1.000 0.447 0.891 0.398 0.794 0.355 0.708 10 0.316 0.631 11 0.282 0.562 12 0.251 0.501.