OBJECTIVE: To evaluate cardiac function at cardiopulmonary bypass weaning, we applied a new technique clinically to determine the approximated Emax without using a conductance catheter. METHODS: Subjects were 5 patients. The left ventricular end-systolic pressure was obtained by overlaying the radial arterial pressure curve on the left ventricular pressure curve. Left ventricular end-systolic volume was assessed by a transesophageal echographic apparatus. At cardiopulmonary bypass weaning, volume loading was applied to increase left atrial pressure by a few mmHg while fixing the pump flow rate at half flow. Changes in left ventricular end-systolic volume and approximated left ventricular end-systolic pressure for total heart beat were plotted during this period, and the gradient of the regression line was taken as approximated Emax. RESULTS: Approximated Emax ranged from 1.29 to 3.28 (mean 2.13 +/- 0.72), and its correlation coefficient was 0.80 +/- 0.06. CONCLUSION: Our new technique is useful in evaluating cardiac function during cardiopulmonary bypass.
OBJECTIVE: To evaluate cardiac function at cardiopulmonary bypass weaning, we applied a new technique clinically to determine the approximated Emax without using a conductance catheter. METHODS: Subjects were 5 patients. The left ventricular end-systolic pressure was obtained by overlaying the radial arterial pressure curve on the left ventricular pressure curve. Left ventricular end-systolic volume was assessed by a transesophageal echographic apparatus. At cardiopulmonary bypass weaning, volume loading was applied to increase left atrial pressure by a few mmHg while fixing the pump flow rate at half flow. Changes in left ventricular end-systolic volume and approximated left ventricular end-systolic pressure for total heart beat were plotted during this period, and the gradient of the regression line was taken as approximated Emax. RESULTS: Approximated Emax ranged from 1.29 to 3.28 (mean 2.13 +/- 0.72), and its correlation coefficient was 0.80 +/- 0.06. CONCLUSION: Our new technique is useful in evaluating cardiac function during cardiopulmonary bypass.
Authors: H Nakajima; H Niinami; T L Hooper; R L Hammond; H O Nakajima; H Lu; R Ruggiero; G A Thomas; F W Mocek; R Fietsam Journal: Ann Thorac Surg Date: 1994-02 Impact factor: 4.330
Authors: J Baan; E T van der Velde; H G de Bruin; G J Smeenk; J Koops; A D van Dijk; D Temmerman; J Senden; B Buis Journal: Circulation Date: 1984-11 Impact factor: 29.690
Authors: K Nomura; H Kurosawa; K Hashimoto; M Yamagishi; K Koyanagi; K Tanaka; K Mashiko; M Nakano Journal: Nihon Kyobu Geka Gakkai Zasshi Date: 1994-10