Myocardial ischemia. Monitoring to diagnose ischemia: how do I monitor therapy?

Area of Science:

• Cardiology
• Anesthesiology
• Critical Care Medicine

Background:

• Myocardial ischemia diagnosis relies on integrating multiple data sources.
• Current diagnostic methods have limitations in sensitivity and specificity.

Purpose of the Study:

• To outline the diagnostic criteria for myocardial ischemia.
• To detail the most sensitive monitoring techniques for ischemia.
• To recommend treatment strategies for diagnosed myocardial ischemia.

Main Methods:

• Electrocardiogram (ECG) analysis for ST depression or elevation.
• Pulmonary artery pressure monitoring.
• Transesophageal echocardiography (TEE) for detecting segmental wall motion abnormalities (SWMA) and diastolic dysfunction (elevated left ventricular end-diastolic pressure - LVEDP).

Main Results:

• ST depression (1 mV) or elevation (2 mV) on ECG are primary diagnostic indicators.
• Pulmonary artery pressure increases (5 mm Hg) are common but not definitive.
• TEE is highly sensitive for detecting SWMA and diastolic dysfunction, making it a superior monitoring tool.

Conclusions:

• Integrated analysis of ECG, pulmonary artery pressures, and TEE is crucial for accurate myocardial ischemia diagnosis.
• TEE offers the highest sensitivity for ischemia detection.
• Treatment involves hemodynamic optimization with beta-blockers and nitrates, alongside maintaining adequate anesthesia, oxygen saturation, and hematocrit (>28%).