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Left ventricular systolic and diastolic function during acute coronary artery balloon occlusion in humans
M E Bertrand1, J M Lablanche, J L Fourrier
1Division of Cardiology B, University of Lille, France.
Insights
Percutaneous transluminal coronary angioplasty temporarily impairs left ventricular function, causing reduced stroke index and ejection fraction. However, left ventricular function fully recovers after the procedure, showing no residual dysfunction.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Percutaneous transluminal coronary angioplasty (PTCA) is a common procedure for treating coronary artery disease.
- Understanding the immediate and short-term effects of PTCA on left ventricular (LV) function is crucial for patient management.
Purpose of the Study:
- To assess changes in left ventricular function during balloon occlusion in PTCA.
- To evaluate the recovery of left ventricular function after the PTCA procedure.
Main Methods:
- Left ventriculography and pressure measurements (Millar micromanometer) were performed before and during balloon inflation in 16 patients.
- Measurements were repeated 30-50 seconds after balloon inflation and in a subset of patients 15 minutes post-procedure.
- Analysis included stroke index, ejection fraction, end-diastolic pressure, and relaxation time constants.
Main Results:
- Balloon inflation caused significant LV dysfunction, characterized by anterior and apical wall dyskinesia, decreased stroke index and ejection fraction, and increased LV end-diastolic pressure.
- A trend towards increased myocardial and chamber stiffness was observed but did not reach statistical significance.
- Left ventricular function returned to baseline levels 15 minutes after the PTCA procedure, with no residual dysfunction noted.
Conclusions:
- Temporary balloon occlusion during PTCA leads to transient left ventricular dysfunction.
- Left ventricular function recovers completely shortly after the procedure, indicating the safety and efficacy of PTCA in preserving cardiac function.
Abstract:
Left ventricular function during percutaneous transluminal coronary angioplasty was studied in 16 patients undergoing the procedure. All measurements were performed before and during the first episode of balloon coronary occlusion. In 16 patients (Group A), data were recorded before and 30 or 50 s after balloon inflation, and in 8 of these patients (Group B) data were also recorded 15 min after the complete procedure. Left ventriculograms indicated a marked dyskinesia of the anterior and apical wall in all patients. After balloon inflation, there was a marked depression in stroke index and ejection fraction and an increase in left ventricular end-diastolic pressure and the time constants of relaxation in all patients. Simultaneous recording of left ventricular pressure (Millar micromanometer) during cineangiography permitted the assessment of myocardial and chamber stiffness. Although there was a strong tendency for both myocardial and chamber stiffness to increase after 30 to 50 s of occlusion, these increases were statistically insignificant. In Group B, a third set of angiographic and pressure measurements obtained 15 min after completion of the coronary angioplasty procedure indicated no residual left ventricular dysfunction, and in this respect, the results are of added clinical importance.