2.1 Rest Imaging Study

• Aseptically withdraw Ammonia N 13 Injection USP from its container and administer 0.368-0.736 GBq (10-20 mCi) as a bolus through a catheter inserted into a large peripheral vein.
  
• Start imaging 3 minutes after the injection and acquire images for a total of 10-20 minutes.

2.2 Stress Imaging Study

• If a rest imaging study is performed, begin the stress imaging study 40 minutes or more after the first Ammonia N 13 Injection USP to allow sufficient isotope decay.
  
• Administer a pharmacologic stress-inducing drug in accordance with its labeling.
  
• Aseptically withdraw Ammonia N 13 Injection USP from its container and administer 0.368-0.736 GBq (10-20 mCi) of Ammonia N 13 Injection USP as a bolus at 8 minutes after the administration of the pharmacologic stress-inducing drug. Start imaging 3 minutes after the Ammonia N 13 Injection USP and acquire images for a total of 10-20 minutes.

2.3 Patient Preparation

To increase renal clearance of radioactivity and to minimize radiation dose to the bladder, ensure that the patient is well hydrated before the procedure and encourage voiding as soon as a study is completed and as often as possible thereafter for at least one hour.

2.4 Radiation Dosimetry

The converted radiation absorbed doses in rem/mCi are shown in Table 1. These estimates are calculated from the Task Group of Committee 2 of the International Commission on Radiation Protection. 1

*Upper large intestine, ** Lower large intestine

2.5 Drug Handling

• Inspect Ammonia N 13 Injection USP visually for particulate matter and discoloration before administration, whenever solution and container permit.
  
• Do not administer Ammonia N 13 Injection USP containing particulate matter or discoloration; dispose of these unacceptable or unused preparations in a safe manner, in compliance with applicable regulations.
  
• Wear sterile gloves and effective shielding when handling Ammonia N 13 Injection USP.
  
• Use aseptic technique to maintain sterility during all operations involved in the manipulation and administration of Ammonia N 13 Injection USP. The contents of each vial are sterile and non-pyrogenic.
  
• Use appropriate safety measures, including shielding, consistent with proper patient management to avoid unnecessary radiation exposure to the patient, occupational workers, clinical personnel, and other persons.
  
• Radiopharmaceuticals should be used by or under the control of physicians who are qualified by specific training and experience in the safe use and handling of radionuclides, and whose experience and training have been approved by the appropriate governmental agency authorized to license the use of radionuclides.
  
• Before administration of Ammonia N 13 Injection USP, assay the dose in a properly calibrated dose calibrator.

5.1 Radiation Risks

Ammonia N 13 Injection USP may increase the risk of cancer. Use the smallest dose necessary for imaging and ensure safe handling to protect the patient and health care worker [see Dosage and Administration (2.4)].

8.1 Pregnancy

Pregnancy Category C

Animal reproduction studies have not been conducted with Ammonia N 13 Injection USP. It is also not known whether Ammonia N 13 Injection USP can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. Ammonia N 13 Injection USP should be given to a pregnant woman only if clearly needed.

8.3 Nursing Mothers

It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for radiation exposure to nursing infants from Ammonia N 13 Injection USP, use alternative infant nutrition sources (e.g. stored breast milk or infant formula) for 2 hours (>10 half-lives of radioactive decay for N 13 isotope) after administration of the drug or avoid use of the drug, taking into account the importance of the drug to the mother.

8.4 Pediatric Use

The safety and effectiveness of Ammonia N 13 Injection USP has been established in pediatric patients based on known metabolism of ammonia, radiation dosimetry in the pediatric population, and clinical studies in adults [see Dosage and Administration (2.4)].

11.1 Chemical Characteristics

Ammonia N 13 Injection USP is a positron emitting radiopharmaceutical that is used for diagnostic purposes in conjunction with positron emission tomography (PET) imaging. The active ingredient, [ 13N] ammonia, has the molecular formula of 13NH 3 with a molecular weight of 16.02g and has the following chemical structure:

Ammonia N 13 Injection USP is provided as a ready to use sterile, pyrogen-free, clear and colorless solution. Each mL of the solution contains between 0.138 GBq to 1.387 GBQ (3.75 mCi to 37.5mCi) of [ 13N] ammonia, at the end of synthesis (EOS), in 0.9% aqueous sodium chloride. The pH of the solution is between 4.5 to 7.5. The recommended dose of radioactivity (0.368-0.736 GBq, 10-20 mCi) is associated with a theoretical mass dose of 0.5-1.0 picomoles (8.47-16.94 picograms) of ammonia.

11.2 Physical Characteristics

Nitrogen N 13 decays by emitting positron to Carbon C 13 (stable) and has a physical half-life of 9.96 minutes. The principal photons useful for imaging are the dual 511 keV gamma photons that are produced and emitted simultaneously in opposite direction when the positron interacts with an electron (Table 2).

*Produced by positron annihilation

The specific gamma ray constant (point source air kerma coefficient) for nitrogen N13 is 1.39 x 10 -6 Gy/hr/kBq (5.9 R/hr/mCi) at 1 cm. The half-value layer (HVL) of lead (Pb) for 511 keV photons is 4 mm. Selected coefficients of attenuation are listed in Table 3 as a function of lead shield thickness. For example, the use of 39 mm thickness of lead will attenuate the external radiation by a factor of about 1000.

Table 4 lists fractions remaining at selected time intervals from the calibration time. This information may be used to correct for physical decay of the radionuclide.

*Calibration time

12.1 Mechanism of Action

Ammonia N 13 Injection USP is a radiolabeled analog of ammonia that is distributed to all organs of the body after intravenous administration. It is extracted from the blood in the coronary capillaries into the myocardial cells where it is metabolized to glutamine N 13 and retained in the cells. The presence of ammonia N 13 and glutamine N 13 in the myocardium allows for PET imaging of the myocardium.

12.2 Pharmacodynamics

Following intravenous injection, ammonia N 13 enters the myocardium through the coronary arteries. The PET technique measures myocardial blood flow based on the assumption of a three-compartmental disposition of intravenous ammonia N 13 in the myocardium. In this model, the value of the rate constant, which represents the delivery of blood to myocardium, and the fraction of ammonia N 13 extracted into the myocardial cells, is a measure of myocardial blood flow. Optimal PET imaging of the myocardium is generally achieved between 10 to 20 minutes after administration.

12.3 Pharmacokinetics

Following intravenous injection, Ammonia N 13 Injection USP is cleared from the blood with a biologic half-life of about 2.84 minutes (effective half-life of about 2.21 minutes). In the myocardium, its biologic half-life has been estimated to be less than 2 minutes (effective half-life less than 1.67 minutes).

The mass dose of Ammonia N 13 Injection USP is very small as compared to the normal range of ammonia in the blood (0.72-3.30 mg) in a healthy adult man [see Description (11.1)].

Plasma protein binding of ammonia N 13 or its N 13 metabolites has not been studied.

Ammonia N 13 undergoes a five-enzyme step metabolism in the liver to yield urea N 13 (the main circulating metabolite). It is also metabolized to glutamine N 13 (the main metabolite in tissues) by glutamine synthesis in the skeletal muscles, liver, brain, myocardium, and other organs. Other metabolites of ammonia N 13 include small amounts of N 13 amino acid anions (acidic amino acids) in the forms of glutamate N 13 or aspartate N 13.

Ammonia N 13 is eliminated from the body by urinary excretion mainly as urea N 13.

The pharmacokinetics of Ammonia N 13 Injection USP have not been studied in renally impaired, hepatically impaired, or pediatric patients.

13.1 Carcinogenesis, Mutagenesis, Impairment o f Fertility

Long term animal studies have not been performed to evaluate the carcinogenic potential of Ammonia N 13 Injection USP. Genotoxicity assays and impairment of male and female fertility studies with Ammonia N 13 Injection USP have not been performed.

Storage

Store at 25°C (77°F); excursions permitted to 15-30°C (59-86°F). Use the solution within 30 minutes of the End of Synthesis (EOS).

17.1 Pre-study Hydration

Instruct patients to drink plenty of water or other fluids (as tolerated) in the 4 hours before their PET study.

17.2 Post-study Voiding

Instruct patients to void after completion of each image acquisition session and as often as possible for one hour after the PET scan ends.

17.3 Post-study Breastfeeding Avoidance

Instruct nursing patients to substitute stored breast milk or infant formula for breast milk for 2 hours after administration of Ammonia N 13 Injection USP.

Manufactured by:      

Mayo Clinic PET Radiochemistry Facility
200 1 st St SW
Rochester, MN 55905

Mayo Clinic PET Radiochemistry Facility
5861 E Mayo Blvd
Phoenix, AZ 85054

Distributed by:      

Mayo Clinic PET Radiochemistry Facility
200 1 st St SW
Rochester, MN 55905

Mayo Clinic PET Radiochemistry Facility
5861 E Mayo Blvd
Phoenix, AZ 85054