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Myocardial dysfunction during percutaneous transluminal coronary angioplasty
M Cleman1, D Wohlgelernter, H Cabin
1Department of Medicine, Yale University School of Medicine, New Haven, Connecticut.
Circulation
|March 1, 1990
Summary
Percutaneous transluminal coronary angioplasty (PTCA) balloon inflation causes temporary heart muscle dysfunction, even when patients show no outward signs. Echocardiography effectively detects this regional hypokinesis during and after the procedure.
Area of Science:
- Cardiology
- Medical Imaging
Background:
- Percutaneous transluminal coronary angioplasty (PTCA) involves balloon inflation, which temporarily blocks coronary arteries, leading to myocardial ischemia.
- Extended balloon inflation times in PTCA, while aiming for better outcomes, can exacerbate ischemia, with consequences often masked by compensatory mechanisms.
Purpose of the Study:
- To investigate the hemodynamic consequences of PTCA-induced ischemia.
- To evaluate the effectiveness of two-dimensional echocardiography in assessing regional myocardial dysfunction during PTCA.
Main Methods:
- Utilized continuous two-dimensional echocardiography to quantitatively assess regional wall motion and ejection fraction.
- Recorded echocardiographic data during baseline, balloon inflation (ischemia), and post-deflation periods.
Main Results:
- Regional hypokinesis of the myocardium at risk occurs within 20 seconds of balloon inflation in patients without collaterals.
- Two-dimensional echocardiography effectively detects the location, extent, and temporal changes of ischemic regional contractile dysfunction.
- PTCA-induced ischemia causes significant, though often transient, alterations in ejection fraction and ventricular volumes.
Conclusions:
- Profound regional myocardial dysfunction occurs during PTCA, even if not apparent through conventional hemodynamic monitoring.
- Two-dimensional echocardiography is a valuable tool for real-time assessment of PTCA-induced ischemia and guiding mitigation strategies.