[Coronary artery bypass grafting surgery in left ventricular dysfunction patients complicated with mitral regurgitation].

Objective: To evaluate the efficacy of coronary artery bypass grafting (CABG) surgery in left ventricular dysfunction patients complicated with different degrees of ischemic mitral regurgitation (IMR). Methods: The clinical data of 525 patients (428 males and 97 females) undergoing CABG in Fuwai Hospital Chinese Academy of Medical Sciences Shenzhen, and Tianjin Medical University General Hospital between January 2015 and December 2018 were collected. The average age was (61±7) years old. Among them, the patients with moderate to serve IMR and left ventricular ejection fraction(LVEF)≤40% were further selected, and the outcomes of CABG were analyzed. Results: In total, 67 patients (48 males and 19 females) with moderate to severe IMR and LVEF≤40% were enrolled, among which 52 patients had moderate IMR, with a LVEF of 38%(35%, 40%). Transesophageal echocardiography (TEE) of 52 cases displayed no damage of papillary muscles, and ventricular wall motion was improved after CABG. Therefore, no treatment on the mitral valve was performed in this group. Six patients were with moderate-severe mitral insufficiency, with a LVEF of 38%(35%, 39%). After surgery, TEE found that the ventricular wall motion and regurgitation were improved, and the mitral valve structures were well. Thus, mitral valves were not treated in these patients. Nine patients were with severe mitral regurgitation, with a LVEF of 38%(35%, 39%). Two of them received valve repair because the papillary muscle function and the ring were well. Another 7 patients received valve replacements because the valve ring was dilatated and the leaflet was prolapsed. All patients recovered well. The LVEF increased significantly at 6 months after surgery [47%(45%, 48%) vs 38%(35%, 39%), P=0.024], and the left ventricular end diastolic diameter also became smaller [57(56, 59) mm vs 61(59, 64) mm, P=0.002]. Conclusions: For patients suffered from left ventricular dysfunction complicated with IMR, TEE is crucial to evaluate the valve function. To those with moderate-severe regurgitation, if papillary muscle function and the ring were seriously affected by ischemia, the valve replacement could facilitate the improvement of postoperative cardiac function.