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Relationship between left ventricular morphology and postoperative cardiac function following valve replacement for
Summary
Myocardial fibrosis impacts left ventricular function after mitral valve replacement. Higher fibrosis levels (>35%) led to increased left ventricular end-diastolic volume index but decreased ejection fraction post-surgery.
Area of Science:
- Cardiology
- Cardiac Surgery
- Pathology
Background:
- Mitral stenosis often necessitates valve replacement.
- Left ventricular myocardial fibrosis is a common finding in patients with mitral stenosis.
Purpose of the Study:
- To investigate the relationship between myocardial fibrosis and cardiac function after mitral valve replacement in patients with mitral stenosis.
Main Methods:
- Examined left ventricular myocardium from 14 patients undergoing mitral valve replacement.
- Quantitated myocardial fibrosis and correlated it with pre- and post-operative cardiac function (LVEDVI, ejection fraction) assessed by echocardiography.
Main Results:
- All patients exhibited perivascular fibrosis (16%-54%).
- Left ventricular end-diastolic volume index increased post-surgery, with the change significantly correlated to fibrosis percentage.
- Ejection fraction improved with <35% fibrosis but decreased with >35% fibrosis.
Conclusions:
- The degree of myocardial fibrosis is a significant determinant of left ventricular performance following mitral valve replacement.
- Preoperative hemodynamic parameters did not predict outcomes.
- Fibrosis quantification may aid in predicting post-operative cardiac function.