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J Thorac Cardiovasc Surg 2000;119:1233-1245
© 2000 The American Association for Thoracic Surgery

SURGERY FOR ACQUIRED CARDIOVASCULAR DISEASE

NONTRANSPLANT CARDIAC SURGERY FOR END-STAGE CARDIOMYOPATHY

From the Departments of Cardiovascular Surgery, Anesthesiology,^aand Cardiology,^b Shonan Kamakura General Hospital, Kanagawa, Japan.

Address for reprints: Hisayoshi Suma, MD, Division of Cardiothoracic Surgery, Hayama Heart Center, 1898, Hayama, Kanagawa 2400166, Japan(E-mail: HisaSuma{at}NetLaputa.ne.jp ).

Objective: To treat end-stage cardiomyopathy, we evaluated endoventricular circular patch plasty, partial left ventriculectomy, and valvular reconstruction alone in our 2-year experience.
Methods: Among 86 patients with heart failure evaluated between December 1996 and February 1999, 33 patients with ischemic cardiomyopathy (25 men and 8 women; mean age 61 ± 7.8 years; New York Heart Association class 3.5 ± 0.5) were treated with endoventricular circular patch plasty combined with coronary bypass grafting (84%) and mitral reconstruction (36%). The other 53 patients with nonischemic cardiomyopathy (45 men and 8 women; mean age 48 ± 14.3 years, New York Heart Association class 3.7 ± 0.5), were treated by left ventricular reduction by partial left ventriculectomy (n = 37) or patch plasty (n = 3) and valve reconstruction alone (n = 13). The first 24 patients (group I) underwent ventriculectomy with or without valve reconstruction; the more recent 29 patients (group II) underwent left ventricular reduction (n = 16) or valve reconstruction alone (n = 13) on the basis of the intraoperative echocardiographic evaluation to observe changes of wall motion and thickness during cardiopulmonary bypass.
Results: Ischemic Group: Hospital mortality in elective (n = 26) and emergency (n = 7) operations was 4% and 43%, and 3 patients died in the late postoperative period. Mean New York Heart Association class and ejection fraction improved from 3.5 ± 0.5 to 1.5 ± 0.7 and from 23% ± 7.7% to 36% ± 8.6%, respectively. Left ventricular end-diastolic and end-systolic volume indexes decreased from 162 ± 46 mL/m² to 110 ± 39 mL/m² and from 130 ± 47 mL/m² to 70 ± 32 mL/m², respectively. Nonischemic Group: In 40 patients with left ventricular reduction, hospital mortality in elective (n = 33) and emergency (n = 7) operations was 6% and 86%, and 5 patients died in the late postoperative period. Mean New York Heart Association class and ejection fraction improved from 3.7 ± 0.5 to 1.7 ± 0.6 and from 18% ± 6.4% to 31% ± 5.9%. Left ventricular end-diastolic and end-systolic volume indexes decreased from 203 ± 45 mL/m² to 110 ± 37 mL/m² and from 164 ± 40 mL/m² to 79 ± 33 mL/m², respectively. In 13 patients undergoing valve reconstruction alone (12 mitral with or without tricuspid and 1 tricuspid plus left ventricular assist device), hospital mortality in elective (n = 9) and emergency (n = 4) operations was 0% and 50% with no late deaths. Mean New York Heart Association class and ejection fraction improved from 3.6 ± 0.5 to 2.0 ± 0.5 and from 22% ± 6.0% to 30% ± 14.5%, respectively. Mean left ventricular end-diastolic and end-systolic volume indexes decreased from 170 ± 34 mL/m² to 150 ± 50 mL/m² and from 140 ± 38 mL/m² to 104 ± 40 mL/m², respectively. Overall mortality decreased from 50% in group I to 10% in group II. The survival estimates at 2 years were 77% (confidence limits 57%-88%) in the ischemic group and 63% (confidence limits 47%-75%) in the nonischemic group (no significant difference). The analysis of our data showed that the factors influencing the surgical results for dilated cardiomyopathy were presence of severe mitral regurgitation, preoperative New York Heart Association functional class IV with emergency operation, and operative procedures with randomly performed partial left ventriculectomy without an intraoperative echo test.
Conclusion: Endoventricular circular patch plasty, partial left ventriculectomy, and solo valve reconstruction can be performed with an acceptably low risk as elective operations. The selection of operative procedures in idiopathic dilated cardiomyopathy and avoidance of emergency surgery improved operative mortality and morbidity. Among patients who survived at least 1 year, there were no late deaths up to 30 months’ follow-up.

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