[Zasshi] [Journal]. Nihon Kyōbu Geka Gakkai
-
Nihon Kyobu Geka Gakkai Zasshi · Mar 1991
Comparative Study[Influence of cardiac pacing on graft flow following aortocoronary bypass surgery--comparison of ventricular and atrial pacing].
To evaluate the influence of cardiac pacing on hemodynamics and graft flow dynamics following aortocoronary bypass surgery, we measured vein graft flow, systolic and diastolic graft flow volume along with blood pressure and cardiac output during atrial and ventricular pacing in 20 patients, 26 grafts. During ventricular pacing, systolic blood pressure showed a significant decline of 17% at the minimum pacing rates (101 +/- 9/min), 17% and 21% at the pacing rates of 120 and 140, respectively (p less than 0.01) in comparison with the original heart rates (96 +/- 8/min). The cardiac output also decreased significantly (p less than 0.01) during ventricular pacing. ⋯ The graft flow was 86 +/- 21 ml/min at the original heart rates and it increased to 93 +/- 24 at the pacing rates of 120 and 95 +/- 26 ml/min at the pacing rates of 140 (p less than 0.01). These increase in graft flow during atrial pacing were attributable to an increase in diastolic graft flow (p less than 0.05). These findings suggest that the atrial pacing following aortocoronary bypass surgery brings about the beneficial effects on coronary perfusion compared with ventricular pacing.
-
Nihon Kyobu Geka Gakkai Zasshi · Mar 1991
Case Reports[Successful excision of right ventricular myxoma].
A 17-year-old woman with right ventricular myxoma is reported. The diagnosis was made by means of two-dimensional echocardiography. Under extracorporeal circulation, the tumor was successfully excised through a right atrial approach. Right ventricular myxoma is a rare disease but when the exact diagnosis has been established, urgent operation is mandatory because of the impending danger of sudden death from pulmonary embolism or obstruction of the outflow tract by the tumor.
-
Nihon Kyobu Geka Gakkai Zasshi · Mar 1991
[Left ventricular cardiomyoplasty by the use of a free latissimus dorsi myograft with a vascular anastomosis--augmentation of regional cardiac performance in dyskinetic segments].
This study was performed to evaluate the ability of a free revascularized Latissimus Dorsi (LD) graft placed on dyskinetic segments of the left ventricle to augment regional left ventricular performance in 8 adult dogs. LD muscles preconditioned for 30 days were revascularized with the internal mammary artery and right atrial appendage. The free graft was sutured on the ischemic area of the left ventricular anterolateral wall, produced by ligation of the left anterior descending coronary artery. ⋯ Values of TDA flow rate, however, increased after the initiation of pacing and reached 270 +/- 38% of control values. In conclusions, this study shows that a revascularized free LD graft has an ability to contract in systole against the left ventricular wall stress, and to augment regional left ventricular performance in dyskinetic segments. And sufficient blood perfusion to the grafts can be maintained during synchronously pacing of the grafts in cardiac systole.