Long-Term Follow-up of Patients with Valvular and Non-valvular Extracardiac Conduits

(Department of Cardiovascular Surgery, School of Medicine, Keio University, Tokyo, Japan)

Toshiyuki Katogi Ryo Aeba Katsumi Moro
Ichiro Kashima Kouji Tsutsumi Yoshimi Iino
Kenichi Hashizume Shigeyuki Takeuchi Shiaki Kawada
Here we present a long-term follow-up of 50 operative survivors, who underwent surgery between December 1975 and March 1994 for the placement of an extracardiac conduit. Twenty-six patients received conduits with various valves (VC group). The valves used were the Hancock valve in 9 patients, the St. Jude Medical valve in 5, and a valved roll made of equine pericardium in 10. Twenty-four patients received valveless Dacron conduits (NVC group). Another group of patients, also with discontinuity between the right ventricle and the pulmonary artery, who were operated on without the use of a conduit, is presented here for comparison (NCR group: 16 patients). The follow-up period for the NCR group was shorter than for the other groups. There were a total of 4 late deaths in the conduit groups, and none in the NCR group. Freedom from reoperation due to conduit stenosis was analyzed by the Kaplan-Meier method. In the VC group, freedom from reoperation at 5, 10, and 15 years, was 87.8%, 50.8%, and 31.2% respectively. In the NVC group, freedom from reoperation at 5,10Cand15 years was 100%, 95.7%, and 60.4%. There were statistically significant differences between the values in these 2 groups. In the NCR group, only one patient (6.25%) underwent reoperation due to stenosis in the right ventricular outflow tract. Although the rate of freedom from reoperation was lower in the valveless conduit group than in the valved conduit group, the majority of patients who receive a conduit between the right ventricle and the pulmonary artery will eventually require reoperation. Avoiding the use of an extracardiac conduit, and creating continuity between the right ventricle and pulmonary artery with autologous tissue is a useful alternative and may reduce the need for reoperation.
@Jpn. J. Cardiovasc. Surg. 29: 79-82 (2000)