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[Prolonged diastolic stunning after unstable anginal attacks]

Y Kawase¹, H Nonogi, N Nakamura

¹Department of Medicine, National Cardiovascular Center, Suita.

Journal of Cardiology

|January 1, 1993

Summary

Severe myocardial ischemia causes persistent left ventricular diastolic dysfunction, potentially indicating diastolic myocardial stunning in unstable angina patients. This dysfunction lasts for days, even after treatment.

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Area of Science:

Cardiology
Cardiovascular Physiology
Echocardiography

Background:

Unstable angina can lead to myocardial ischemia, affecting cardiac function.
Left ventricular diastolic filling dynamics are crucial indicators of cardiac health.
Assessing diastolic dysfunction is important for managing ischemic heart disease.

Observation:

Serial pulsed Doppler examinations of mitral flow were conducted in 10 unstable angina patients.
Measurements included peak early and late filling velocities (E and A), E/A ratio, and areas (Ei, Ai), and Ei/Ai ratio.
Data were collected at 1, 3, 7 days, and 1 month post-ischemia and post-percutaneous transluminal coronary angioplasty (PTCA) in 7 patients.

Findings:

Left ventricular diastolic dysfunction persisted for several days after ischemia stabilization.

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E/A and Ei/Ai ratios significantly increased by day 3 and 7, but plateaued by 1 month.

Diastolic dynamics remained unchanged before and after PTCA once ischemia was stabilized pharmacologically.

Implications:

Severe myocardial ischemia induces a temporary diastolic dysfunction, termed 'diastolic myocardial stunning'.
This diastolic dysfunction is a persistent consequence of ischemia in unstable angina.
Findings suggest diastolic stunning may be a key mechanism in unstable angina pathophysiology.