Right Ventricular Systolic Function Is Not Depressed In Morbid Obesity |
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Authors: | Charles Her MD FCCP Thomas Cerabona MD FCCM Mosses Bairamian MD Kathryn E McGoldrick MD |
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Institution: | (1) Department of Anesthesiology, New York Medical College, Valhalla, NY, USA;(2) Department of Anesthesiology, New York Medical College, Valhalla, NY, USA;(3) Department of Anesthesiology, New York Medical College, Valhalla, NY, USA;(4) Department of Anesthesiology, New York Medical College, Valhalla, NY, USA |
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Abstract: | Background: The increased pulmonary blood volume associated with the increased total blood volume in morbidly obese patients
increases pulmonary artery pressure and pulmonary vascular resistance, resulting in increased right ventricular (RV) afterload.
Thus, the morbidly obese may develop RV dysfunction owing to the increased RV afterload. We examined this possibility by assessing
RV contractile function in morbidly obese patients, using RV end-systolic pressure-volume relationship and RV systolic time
intervals. Methods: Included were 25 morbidly obese patients undergoing gastric bypass surgery under general anesthesia. Pulmonary
artery pressure and RV end-systolic volume were measured with a thermodilution pulmonary artery catheter. Pulmonary arterial
dicrotic notch pressure was used as an estimate of RV end-systolic pressure. Two data points were used to define RV end-systolic
pressure-volume relationship. RV systolic time intervals were determined by simultaneous graphic display of the electrocardiograph,
phonocardiograph, and pulmonary artery pressure curve, and were expressed as a pre-ejection period/RV ejection time ratio.
Results: The mean slope of right ventricular end-systolic pressure-volume relationship line was 0.54 ± 0.13 and mean pulmonary
vascular resistance 274 ± 80 dyne·sec·cm−5·m−2. The mean pre-ejection period/RV ejection time ratio was 0.4 ± 0.11. There was an inverse correlation between the pre-ejection/RV
ejection time ratio and the slope of RV end-systolic pressure-volume relationship line (R2=0.658, P<0.0001). Conclusion: Our data indicate that RV function is not depressed in morbid obesity despite increased RV afterload. |
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Keywords: | PULMONARY VASCULAR RESISTANCE PULMONARY HYPERTENSION RIGHT VENTRICULAR FUNCTION MORBID OBESITY |
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