Interactive cardiovascular and thoracic surgery
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Interact Cardiovasc Thorac Surg · Nov 2010
Venous obstruction and cerebral perfusion during experimental cardiopulmonary bypass.
To investigate the effects on cerebral perfusion by experimental venous congestion of the superior vena cava (SVC) during bicaval cardiopulmonary bypass (CPB) at 34 °C, pigs were subjected to SVC obstruction at levels of 75%, 50%, 25% and 0% of baseline SVC flow at two arterial flow levels (low, LQ, high, HQ). The cerebral perfusion was examined with near-infrared spectroscopy (NIRS), cerebral microdialysis and blood gas analysis. SVC obstruction caused significant decreases in the NIRS tissue oxygenation index (TOI) and in SVC oxygen saturations (P<0.05, both groups), while the mixed venous saturation was decreased only in the LQ group. ⋯ The total venous drainage remained stabile throughout the experiment, indicating increased flow in the inferior vena cava cannula. The results indicate that SVC congestion may impair cerebral perfusion especially in the case of compromised arterial flow during CPB. Reduced SVC cannula flow may pass undetected during bicaval CPB, if SVC flow is not specifically monitored.
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Interact Cardiovasc Thorac Surg · Nov 2010
The stented elephant trunk procedure combined total arch replacement for Debakey I aortic dissection: operative result and follow-up.
The stented elephant trunk technique in aortic arch replacement combined with transaortic stented graft implantation into the descending aorta has been introduced as a means of eliminating the residual false lumen in the descending thoracic aorta and improving long-term outcomes of surgical intervention for Debakey I aortic dissection. This report summarizes the operative and follow-up data with this new procedure. Between August 2004 and May 2009, 28 stented elephant trunk operations were performed for Debakey I aortic dissection at Nanjing First Hospital. ⋯ Thrombus obliteration of the residual false lumen in the descending aorta was observed in 91.7% of the aortic dissections three months postoperatively. The survival rate was 87.5% at five years and the freedom from reoperation rate was 91.7%. Total aortic arch replacement combined with transaortic stented graft implantation into the descending aorta is an effective treatment for Debakey type I aortic dissection.