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Left ventricular function in chronic mitral regurgitation: preoperative and postoperative comparison
W J Corin1, G Sütsch, T Murakami
1Division of Cardiology, University Hospital, Zurich, Switzerland.
Insights
Mitral valve surgery impacts left ventricular function. Reconstruction preserves systolic and diastolic function, while replacement with chordal interruption leads to dysfunction.
Area of Science:
- Cardiology
- Cardiac Surgery
- Cardiovascular Physiology
Background:
- Chronic mitral regurgitation can lead to a decline in left ventricular systolic function post-surgery.
- Understanding the impact of surgical interventions on cardiac function is crucial for patient outcomes.
Purpose of the Study:
- To evaluate the effects of surgical procedures on left ventricular (LV) systolic and diastolic function in patients with mitral regurgitation.
- To compare the functional outcomes of mitral valve reconstruction versus valve replacement.
Main Methods:
- Simultaneous cineangiography and left ventricular micromanometry were used to assess LV function.
- 14 patients with chronic mitral regurgitation were studied preoperatively and postoperatively (average 22 months).
- Patients underwent either mitral valve reconstruction (8) or valve replacement with chordal interruption (6), compared to 10 controls.
Main Results:
- Preoperatively, LV systolic function was normal, with altered diastolic filling and stiffness in mitral regurgitation patients.
- Post-reconstruction, LV systolic and diastolic function returned to normal.
- Post-replacement, global systolic function was depressed, with regional dysfunction and impaired diastolic function (prolonged relaxation, reduced filling).
Conclusions:
- The surgical approach for mitral regurgitation significantly influences postoperative left ventricular function.
- Mitral valve reconstruction preserves both systolic and diastolic LV function.
- Mitral valve replacement with chordal interruption is linked to systolic and diastolic dysfunction.
Objectives:
The present study was designed to evaluate the effects of surgical procedure on left ventricular systolic and diastolic function in patients with mitral regurgitation.
Background:
Left ventricular systolic function has been shown to decline after operation in patients with chronic mitral regurgitation.
Methods:
Using simultaneous cineangiography and left ventricular micromanometry, we evaluated left ventricular systolic and diastolic function in 14 patients with chronic mitral regurgitation both preoperatively and at an average of 22 months after operation. Eight patients underwent mitral valve reconstruction, and six had a valve replacement with interruption of the chordae tendineae. We compared these patients with 10 control subjects.
Results:
Preoperatively, patients with mitral regurgitation demonstrated normal global and regional left ventricular systolic function. Peak rate of diastolic filling was increased (p < 0.01), and passive chamber stiffness was decreased, compared with that in control subjects (p < 0.01), and there was normal myocardial stiffness. Postoperatively, systolic and diastolic function returned to normal in patients undergoing mitral valve reconstruction. In contrast, global systolic function was depressed in patients after valve replacement (p < 0.05), with regional dysfunction in the area of papillary muscle attachment (p < 0.01). Diastolic function was depressed in this group, with a prolonged time constant of pressure decay (p < 0.01) and a depressed rate of early diastolic filling and strain rate (p < 0.05). Passive elastic stiffness was within the normal range in all postoperative patients.
Conclusions:
The type of operation performed to correct chronic mitral regurgitation has an important effect on postoperative left ventricular function. Systolic and diastolic function are preserved after mitral valve reconstruction. Mitral valve replacement with chordal interruption is associated with global and regional systolic dysfunction and early diastolic filling and relaxation abnormalities.