Key result
Immediately after surgical correction of mitral regurgitation, left ventricular fractional area change significantly decreased from 65% to 52% primarily due to an increase in end-systolic dimensions, while stroke volume remained unchanged.
Why the study?
Does surgical correction of mitral valve degenerative prolapse alter immediate postoperative left ventricular geometry and function compared to CABG?
Cohort (n=40)
No
Does surgical correction of mitral valve degenerative prolapse alter immediate postoperative left ventricular geometry and function compared to CABG?
Absolute Event Rate: 52% vs 57%
p-value: p=<0.001
Early after mitral valve surgery for degenerative prolapse, LV fractional area change decreases primarily due to increased end-systolic dimensions, which may serve as a compensatory mechanism to maintain stroke volume.
Preserved stroke volume despite reduced fractional area change suggests stable early hemodynamics after MR surgery; leaves open long-term implications versus CABG.
Aim. Mitral valve surgery results in the left ventricular (LV) remodelling and adjustment to the new preload and afterload. This study evaluated the dynamics ofLVgeometry and function immediately after surgical correction of mitral valve (MV) degenerative prolapse. Material and methods. This prospective study included 40 patients: 25 after MV surgery and 15 after coronary artery bypass graft surgery. The latter group served as controls, in order to assess potential impact of cardiopulmonary bypass and cardioplegic arrest onLV function. All participants underwent intraoperative transesophageal echocardiography, before and after cardiopulmonary bypass, after protamine infusion and hemodynamic stabilisation. Simultaneous pulmonary catheterisation ensured that the echocardiographic data were obtained in similar hemodynamic conditions. Results. Immediately after MV surgery,LV fractional area change decreased from 65±7% to 52±% (p<0,001). End-diastolic LV area decreased from 21,3±5,3 to 19,4±4,5 cm 2 (p=0,005), while end-systolic LV area increased from 7,5±2,3 to 9,3±2,5 cm 2 (p<0,001). Stroke volume, measured by the thermodilution method, did not change (54±12% and 57±0%; p=0,5). In the control group,LV fractional area change (54±12% and 57±10%; p=0,19), end-diastolicLV area (16,6±6,2 and 15,7±5,0 cm 2; p=0,32), and stroke volume (72±29 and 65±19 ml; p=0,15) were similar before and after cardiopulmonary bypass; there was only some reduction in end-systolicLVarea (7,9±4,4 and 6,9±3,2 cm 2; p=0,03). Conclusion. Early after MR surgery,LV fractional area change statistically decreased, primarily due to an increase in end-systolicLVdimensions. It could be one of the compensatory mechanisms to prevent acute increase in stroke volume and subsequent MR after MV surgery.
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Ashikhmina et al. (2013) conducted a cohort in Mitral regurgitation (degenerative prolapse) (n=40). Mitral valve repair vs. Coronary artery bypass graft (CABG) surgery was evaluated on Left ventricular fractional area change (FAC) immediately after cardiopulmonary bypass (p=<0.001). Immediately after surgical correction of mitral regurgitation, left ventricular fractional area change significantly decreased from 65% to 52% primarily due to an increase in end-systolic dimensions, while stroke volume remained unchanged.
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