Myocardial ischaemic time and its relation with left ventricular ejection fraction after single valve replacement

Area of Science:

• Cardiovascular Surgery
• Cardiac Anesthesia
• Echocardiography

Background:

• Left ventricular ejection fraction (LVEF) is a key indicator of cardiac function post-valve replacement surgery.
• Myocardial ischemic time is a critical factor influencing cardiac recovery after cardiopulmonary bypass.
• Understanding the relationship between ischemic time and LVEF is crucial for optimizing surgical outcomes.

Purpose of the Study:

• To investigate the correlation between myocardial ischemic time and changes in LVEF up to six months after valve replacement surgery.
• To assess the impact of aortic cross-clamping duration on postoperative LVEF.

Main Methods:

• Single-center observational study including 44 patients undergoing valve replacement.
• Serial echocardiographic examinations at baseline, 2 weeks, and 6 months post-operation.
• Analysis of myocardial ischemic time (aortic cross-clamping) and its association with LVEF changes.

Main Results:

• Significant improvements in LVEF were observed at six months post-surgery (59±10% to 63±10%).
• Left ventricular dimensions (LVEDD and LVESD) showed significant reductions at six months.
• No significant correlation was found between aortic cross-clamping time and LVEF changes at early or late postoperative periods.

Conclusions:

• Postoperative LVEF improves significantly at six months following valve replacement surgery.
• The duration of myocardial ischemic time does not appear to significantly affect LVEF changes in the early and late postoperative periods.