![]() Measured values were statistically analyzed to evaluate correlation between cardiac output and end-tidal CO2 tension. We also measured arterial CO2 tension, and end-tidal CO2 tension at the time of 10% decrease(phasel), 15% decrease(phase2)and 20% decrease(phase3) of cardiac output respectively. To understand the effect of cardiac output on end-tidal CO2 tension and the difference between arterial CO2 tension and end-tidal CO2 tension, We measured cardiac output before and dutiag administration of nitroglycerine and sodium nitropruside for relieve of myocardial load before aortic clamping in 30 male patients undergoing aortic recontructive surgery under endotracheal anesthesia for repair of infrarenal aortic obstruction. Decrease of alveolar capillary perfusion from low cardiac output is the most important cause of low measure of end-tidal CO and large difference between arterial CO2 and end-tidal CO2 concentration in perioperative period. In clinical situation, the major factor which determines alveolar dead space is low pulmonary blood flow. The difference is originated from alveolar dead space gas which dilute concentration of CO2 from normal alveoli. is different from that of arterial CO2 even in normal individual. ![]() A normal curve on capnogram suggests normal CO2 production, adequate circulation, and adequate ventilation. The Effect of Decrease in Cardiac Output on End-Tidal CO2 and Difference between Arterial and End-Tidal CO2 Tension.ĭepartment of Anesthesiology, Catholic University Medical College, Seoul, Korea.Ĭapnogram, monitoring of end-tidal CO2, has been a popular tool for assessment of ventilatory status during modern anesthesia.
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