TY - JOUR
T1 - Functional consequences of the right ventricular isolation procedure
AU - Damiano, R. J.
AU - Asano, T.
AU - Smith, P. K.
AU - Ferguson, T. B.
AU - Cox, J. L.
PY - 1990
Y1 - 1990
N2 - The right ventricular free wall was surgically isolated from the remainder of the heart in eight dogs to evaluate the functional consequences of this procedure. Each dog was instrumented with ultrasonic dimension transducers in the right and left ventricular free walls, intracavitary micromanometers, and pulmonary artery flow probes. Volume loading and vena caval occlusions were performed to assess diastolic compliance and systolic function. Right ventricular unstressed myocardial segment length increased from 14.2 ± 0.7 to 15.0 ± 0.8 mm (p < 0.5). There was an accompanying significant postoperative loss of right ventricular diastolic compliance (p < 0.005). Regional right ventricular systolic function and regional left ventricular diastolic compliance and systolic function were preserved after the procedure. Postoperatively, when the right ventricular free wall was not paced and left silent, right ventricular stroke work decreased from 7.0 ± 0.8 to 2.7 ± 0.5 gm-m/m2 (p < 0.05). These data demonstrate that the diastolic compliance of the right ventricular free wall decreases significantly after right ventricular isolation. However, there were no changes in regional right ventricular sytolic or regional left ventricular function. The isolated right ventricular free wall contributes significantly to postoperative cardiac performance.
AB - The right ventricular free wall was surgically isolated from the remainder of the heart in eight dogs to evaluate the functional consequences of this procedure. Each dog was instrumented with ultrasonic dimension transducers in the right and left ventricular free walls, intracavitary micromanometers, and pulmonary artery flow probes. Volume loading and vena caval occlusions were performed to assess diastolic compliance and systolic function. Right ventricular unstressed myocardial segment length increased from 14.2 ± 0.7 to 15.0 ± 0.8 mm (p < 0.5). There was an accompanying significant postoperative loss of right ventricular diastolic compliance (p < 0.005). Regional right ventricular systolic function and regional left ventricular diastolic compliance and systolic function were preserved after the procedure. Postoperatively, when the right ventricular free wall was not paced and left silent, right ventricular stroke work decreased from 7.0 ± 0.8 to 2.7 ± 0.5 gm-m/m2 (p < 0.05). These data demonstrate that the diastolic compliance of the right ventricular free wall decreases significantly after right ventricular isolation. However, there were no changes in regional right ventricular sytolic or regional left ventricular function. The isolated right ventricular free wall contributes significantly to postoperative cardiac performance.
UR - http://www.scopus.com/inward/record.url?scp=0025131204&partnerID=8YFLogxK
U2 - 10.1016/s0022-5223(19)35502-3
DO - 10.1016/s0022-5223(19)35502-3
M3 - Article
C2 - 2214833
AN - SCOPUS:0025131204
SN - 0022-5223
VL - 100
SP - 569
EP - 579
JO - Journal of Thoracic and Cardiovascular Surgery
JF - Journal of Thoracic and Cardiovascular Surgery
IS - 4
ER -