Kit For The Preparation Of Technetium Tc99m Pyrophosphate

Technetium Tc 99m Pyrophosphate Injection is a bone imaging agent used to demonstrate areas of altered osteogenesis, and a cardiac imaging agent used as an adjunct in the diagnosis of acute myocardial infarction.

After preparation with oxidant-free Sodium Pertechnetate Tc 99m Injection, the suggested dose range of Technetium Tc 99m Pyrophosphate Injection in the average ADULT patient (70 kg) is:

The suggested dose range of the non-radioactive reconstituted Kit for the Preparation of Technetium Tc 99m Pyrophosphate Injection in the average ADULT patient (70 kg) is:

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Technetium Tc 99m Pyrophosphate Injection is injected intravenously over a 10 to 20 second period. For optimal results, bone imaging should be done 1 to 6 hours following administration. Cardiac imaging should be done 30 to 90 minutes following administration. The acute myocardial infarct can be visualized from 24 hours to 6 days following onset of symptoms, with maximum localization at 48 to 72 hours. Cardiac imaging should be done with a gamma scintillation camera. It is recommended that images be made of the anterior, left anterior oblique and left lateral projections.

Some hypersensitivity reactions have been associated with pyrophosphate use.

Each 10 mL vial contains 12.0 mg of sodium pyrophosphate, 2.8 mg minimum stannous tin as stannous chloride dihydrate and 4.9 mg maximum total tin as stannous chloride dihydrate; pH is adjusted to 5.3-5.7 with hydrochloric acid prior to lyophilization. No bacteriostatic preservative is present. Sealed under nitrogen.

The chemical names are: (1) Diphosphoric acid, Ditin (2
⁺) salt; (2) Ditin (2
⁺) pyrophosphate (4
^-). The structural formula is:

When a solution of sterile, non-pyrogenic, oxidant-free isotonic Sodium Pertechnetate Tc 99m Injection U.S.P. is added to the vial, Technetium Tc 99m Pyrophosphate Injection is formed for intravenous injection.

When a solution of sterile, non-pyrogenic, isotonic saline is added to the vial, it forms


a blood pool imaging agent when Sodium Pertechnetate Tc 99m Injection is injected intravenously 30 minutes after the intravenous administration of the non-radioactive reconstituted Kit for the Preparation of Technetium Tc 99m Pyrophosphate Injection. The precise structure of Technetium Tc 99m Pyrophosphate Injection is not known at this time.

When injected intravenously, Technetium Tc 99m Pyrophosphate Injection has a specific affinity for areas of 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 Injection, an estimated 40 to 50 percent of the injected dose has been taken up by the skeleton, and approximately 0.01 to 0.02 percent per gram of acutely infarcted myocardium. Within a period of one hour, 10 to 11 percent remains in the vascular system, declining to approximately 2 to 3 percent twenty-four hours post injection.

The average urinary excretion was observed to be about 40 percent of the administered dose after 24 hours.