The Journal of thoracic and cardiovascular surgery
-
J. Thorac. Cardiovasc. Surg. · Jul 1991
Extracorporeal membrane oxygenation for perioperative support in pediatric heart transplantation.
Extracorporeal membrane oxygenation has demonstrated effectiveness for cardiopulmonary support in a variety of clinical situations. This article reviews the cases in which extracorporeal membrane oxygenation was used as an adjunct to pediatric cardiac transplantation. Twenty children, aged 7 days to 17 years, with cardiac failure refractory to conventional therapy received extracorporeal membrane oxygenation for 6 to 192 hours. ⋯ One long-term survivor was in the bridge-to-transplant group, 4 in the immediate postoperative group, and 2 in the rejection group. All survivors have normal cardiac allograft function. These data suggest that extracorporeal membrane oxygenation can be used to support profound cardiac failure in the pediatric heart transplant patient as a bridge to transplantation, in the resuscitation of the cardiac allograft, or to supplement a rejecting allograft.
-
J. Thorac. Cardiovasc. Surg. · Jul 1991
Preservation of aortic valve in type A aortic dissection complicated by aortic regurgitation.
Two hundred fifty-two patients underwent operation for type A aortic dissection at Stanford University Medical Center from 1963 to 1987 and Duke University Medical Center from 1975 to 1988. Sixty-seven percent had an acute type A dissection and 33% had a chronic type A dissection. In addition to repair or replacement of the ascending aorta, 121 patients (48%) required an aortic valve procedure. ⋯ Multivariate analysis showed advanced age (p less than 0.001), previous cardiac or aortic operation (p less than 0.001), more preoperative dissection complications (p = 0.002), and earlier operative date (p = 0.038) to be the only significant, independent factors that increased the likelihood of early or late death. The type of aortic valve procedure (resuspension versus aortic valve replacement versus none) was not a significant predictor of mortality. Two of 46 patients with valve resuspension required late aortic valve replacement (freedom from aortic valve replacement: 100% and 80% +/- 13% at 5 and 10 years, respectively), as did 4 of 75 patients with initial aortic valve replacement (freedom from repeat aortic valve replacement: 98% +/- 2% and 73% +/- 13%, respectively).(ABSTRACT TRUNCATED AT 400 WORDS)
-
J. Thorac. Cardiovasc. Surg. · Jul 1991
Effects of dynamic cardiomyoplasty on left ventricular performance and myocardial mechanics in dilated cardiomyopathy.
We tested the hypothesis that dynamic cardiomyoplasty produces beneficial changes in the functional mechanics of the dilated, failing left ventricle. Chronic dilated cardiomyopathy was induced in seven mongrel dogs by rapid ventricular pacing (260 beats/min) for 3 to 4 weeks. After completion of the induction period, dynamic cardiomyoplasty was performed with the left latissimus dorsi muscle, paced synchronously with the R waves of the electrocardiogram (Medtronic SP1005). ⋯ Although skeletal muscle contraction increased the pressure development in the left ventricular chamber, mean systolic wall stress was diminished by concomitant changes in left ventricular dimensions (116,144 +/- 11,530 versus 101,268 +/- 7464 dynes/cm2, p less than 0.05). At end-systole, wall thickness increased (11.8 +/- 1.1 versus 12.7 +/- 1.1 mm, p less than 0.01), minor axis dimension decreased (51.3 +/- 1.4 versus 49.2 +/- 1.8 mm, p less than 0.01), and major axis dimension also decreased (85.6 +/- 3.3 versus 79.0 +/- 2.3 mm, p less than 0.05). Our detailed evaluation of left ventricular chamber mechanics suggests that dynamic cardiomyoplasty may have a role in ameliorating the functional and mechanical derangements associated with progression of dilated cardiomyopathy both by augmenting cardiac performance and by diminishing determinants of myocardial oxygen consumption. (All values are expressed as mean +/- standard error of the mean.)
-
J. Thorac. Cardiovasc. Surg. · Jul 1991
Transcranial Doppler-estimated versus thermodilution-estimated cerebral blood flow during cardiac operations. Influence of temperature and arterial carbon dioxide tension.
The ability of the noninvasive continuous transcranial Doppler technique to reflect changes in cerebral blood flow during cardiac operations was evaluated in seven adults. Middle cerebral artery blood flow velocity changes were compared with simultaneous thermodilution measurements of venous blood flow in the ipsilateral internal jugular vein during 11 preset stages of the procedure. Cerebral blood flow was varied by changes in arterial carbon dioxide tension and temperature. ⋯ The significant arterial carbon dioxide tension changes had no significant effects either on Doppler- or thermodilution-estimated cerebral metabolic rate for oxygen. Deep hypothermia (20 degrees C) reduced Doppler- and thermodilution-estimated cerebral metabolic rate for oxygen to 22.0% +/- 3.9% and 20.6% +/- 6.9% of the awake levels, respectively. The study supports the validity of using middle cerebral arterial flow velocity changes as an estimate of changes in volume flow through the brain during cardiac operations.
-
J. Thorac. Cardiovasc. Surg. · Jul 1991
Cold cerebroplegia. A new technique of cerebral protection during operations on the transverse aortic arch.
Profound hypothermia associated with circulatory arrest is the commonest method of cerebral protection during operations on the aortic arch. This technique allows a limited time to perform the aortic repair, however. It also necessitates prolonged cardiopulmonary bypass to rewarm the patient. ⋯ In our experience the technique of "cold cerebroplegia" has been demonstrated to provide excellent cerebral protection. It requires no prolonged cardiopulmonary bypass and does not limit the time necessary to perform the aortic repair. It may be considered as a safe alternative to profound hypothermia associated with circulatory arrest.