Journal of cardiothoracic and vascular anesthesia
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J. Cardiothorac. Vasc. Anesth. · Aug 1998
Effect of mild hypothermia during cardiopulmonary bypass on erythrocytic hemoglobin oxygen delivery.
To observe and define the degree of change in hemoglobin oxygen affinity induced by hypothermic extracorporeal circulation (ECC). ⋯ Mild hypothermia to 32 degrees C during ECC does not result in in vivo alterations in oxyhemoglobin dissociation and thus does not induce changes in oxygen delivery to peripheral tissues. However, oxygen usage appears to be markedly increased after cardiopulmonary bypass.
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J. Cardiothorac. Vasc. Anesth. · Aug 1998
A novel alpha 2-adrenoceptor antagonist attenuates the early, but preserves the late cardiovascular effects of intravenous dexmedetomidine in conscious dogs.
To test the hypothesis that L-659,066, a peripherally acting alpha 2-adrenoceptor agonist, will abolish the early pressor response but preserve the late depressor action of intravenous dexmedetomidine in conscious, unsedated dogs. ⋯ L-659,066 prevents the immediate pressor effects of 5 micrograms/kg of intravenous dexmedetomidine but preserves the majority of the late beneficial cardiovascular effects of this selective alpha 2-adrenoceptor agonist in conscious dogs.
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J. Cardiothorac. Vasc. Anesth. · Aug 1998
Comparative StudyThe clinical relevance of hemoglobin, platelet, and serotonin changes in sequestered and circulating blood during cardiopulmonary bypass.
To determine how hemoglobin (Hb), platelet, and serotonin concentrations change during cardiopulmonary bypass (CPB) in sequestered blood from the pulmonary artery compared with circulating systemic blood; and to determine the correlation between platelet and serotonin variability at the two sites and clinical outcome measurements related to hemodynamics and blood loss. ⋯ During CPB, there were significant differences in Hb, platelet, and serotonin concentrations in sequestered pulmonary artery blood compared with circulating systemic blood. The initial differences and subsequent changes were most likely attributable to decreased hemodilution and a different pattern of platelet activation in the pulmonary artery blood compared with the systemic blood. Despite the hematologic differences, serotonin concentration and platelet counts in the pulmonary artery blood had significant correlation to indices of cardiac function and postoperative chest tube drainage, respectively. Platelet and serotonin changes in sequestered pulmonary artery blood were also associated with some of the adverse consequences of CPB.