Clinical Nuclear Medicine Applications
The NMAA exam tests clinical nuclear medicine as applied by an advanced practice technologist: matching indication to protocol, recognizing normal and abnormal biodistribution, and separating true pathology from artifact across cardiac, oncologic, skeletal, renal, endocrine, and pulmonary studies.
Core rules
- Protocol choice follows the clinical question and pre-test probability; document medications, prior studies, and contraindications before radiopharmaceutical administration.
- Myocardial perfusion: exercise stress is preferred when the patient can achieve adequate workload; vasodilator stress (regadenoson, adenosine, dipyridamole) is used when exercise is inadequate or contraindicated.
- Caffeine, methylxanthines, and theophylline blunt adenosine/regadenoson response and must be withheld per department policy, commonly 12 hours for caffeine.
- Recognize fixed versus reversible defects; breast and diaphragmatic attenuation, patient motion, and left bundle branch block (LBBB) mimic ischemia.
Worked example
A 62-year-old with LBBB and good functional capacity is scheduled for SPECT myocardial perfusion imaging. Which stress modality is preferred? Reasoning: Exercise stress in LBBB is associated with false-positive septal perfusion defects from septal dyssynchrony. Vasodilator stress reduces that artifact, so regadenoson or adenosine is preferred even if the patient can exercise. If severe reactive airway disease is present, adenosine is relatively contraindicated and an alternative such as exercise with careful interpretation or dobutamine must be considered.
Traps
- Treating a septal defect in LBBB as ischemia without considering the stress modality.
- Missing recent caffeine intake before regadenoson.
- Calling attenuation artifact ischemia on a single view instead of reviewing all planes and raw data.