Pharmacologic stress myocardial perfusion imaging

Area of Science:

• Cardiology
• Nuclear Medicine

Background:

• Pharmacologic stress agents (dipyridamole, adenosine, dobutamine) enable safe ischemic heart disease assessment.
• These agents have side effects requiring knowledge of contraindications and management.
• Adjunctive exercise can improve image quality in vasodilator myocardial perfusion imaging.

Purpose of the Study:

• To highlight the utility of pharmacologic stress agents and myocardial perfusion imaging (MPI) in cardiovascular assessment.
• To emphasize the increased cardiac event rate and asymptomatic ischemia in diabetics.
• To advocate for MPI screening in diabetics and its role in predicting revascularization outcomes.

Main Methods:

• Review of pharmacologic stress agents and their application in myocardial perfusion imaging (MPI).
• Discussion of specific patient populations, including diabetics and those with left bundle branch block or paced rhythms.
• Emphasis on MPI's ability to assess myocardial viability and predict functional improvement.

Main Results:

• Pharmacologic stress agents allow safe assessment of ischemic heart disease in most patients.
• Diabetics, particularly women, exhibit higher cardiac event rates and asymptomatic ischemia.
• MPI effectively identifies viable myocardium, predicting functional recovery after revascularization.

Conclusions:

• Pharmacologic stress agents are essential tools for ischemic heart disease evaluation, necessitating thorough understanding of their use.
• Myocardial perfusion imaging (MPI) is a powerful modality for screening high-risk diabetic populations and guiding revascularization strategies.
• Vasodilator MPI is recommended as the initial test for patients with left bundle branch block or paced ventricular rhythm, irrespective of exercise capacity.