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pg. 1 Nuclear Medicine Board Review 9.0 Newest 2025 Actual Exam| Complete Questions and Correct Detailed Answers (Verified Answers) Already Graded A+ (Brand New!!)
What is the PR interval? - ANSWER - blood flowing from atrium to ventricles
What is the ST segment? - ANSWER - rest period between depression and re polarization (relaxation)
what does it mean that ventricles and atria are 180 degrees out of phase?
- ANSWER - atria contract while ventricles relax
why is repolarization of atria not seen on an ECG? - ANSWER - covered by the QRS complex
what is ST segment depression? - ANSWER - myocardial ischemia (segment falls below baseline which means decreased blood flow to the myocardium)
what is myocardial ischemia? - ANSWER - decreased blood flow to the myocardium dye to narrowing or occlusion of coronary arteries (is reversible)
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pg. 2 what is myocardial infarction? - ANSWER - total occlusion or narrowing of coronary artery due to blood clot
what are the signs and symptoms of an acute MI? - ANSWER - angina, diaphoresis (sweat), belching, nausea, dyspnea, elevated ST segment, tachycardia
what is viable myocardium? - ANSWER - tissue may be a risk for an infarction MPI testing can see if treatment will help
what is hibernating myocardium? - ANSWER - chronic ischemic condition, may be viable but appears not to function due to decreased perfusion very likely to benefit from revascularization
what is stunned myocardium? - ANSWER - episode of acute ischemia or MI where the heart is deprived of blood must have timely restoration of perfusion to salvage the muscle
what can myocardial perfusion imaging be used to assess? - ANSWER - ischemia, myocardial infarction, hibernating or stunned myocardium
what are the imaging agents that can be used for MPI imaging? - ANSWER - 201TI-thallous chloride, 99mTc-Sestamibi or 99mTc- 2 / 3
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pg. 3 Tetrofosmin, 82Rb-rubudium chloride, 13N-Ammonia, 18F-FDG (flurodeoxyglucose)
what reasons are MPI tests done? - ANSWER - CAD, coronary artery stenosis, viability, post MI, monitor effects of treatments
what is the other component besides the injection that occurs with MPI?
- ANSWER - treadmill or pharmacological induced stress testing
with treadmill stress testing what are you trying to accomplish and how do you do so? - ANSWER - recreate symptoms of exercise use 12 lead ECG, inject isotope at peak stress (to visualize ischemic areas), and ensure that the patient continues 1-2 minutes post injection to maintain maximum myocardial oxygen demand
how long must the patient fast prior to treadmill exercise? - ANSWER -
- hours
what types of medications must be stopped before treadmill exercise? - ANSWER - calcium channel and beta blockers
what % of heart rate must be achieved and how do you find this value? - ANSWER - 85% of patient's maximum HR must be reached 220-patient's age= max heart rate
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