PMID: 18706209Aug 19, 2008Paper

Assessment of right ventricular function by pressure-volume loops in off-pump coronary artery bypass surgery

Chinese Medical Journal
Hong-wei ZhaoYun Yue

Abstract

Right ventricular function plays an important role in the hemodynamic derangement during off-pump coronary artery bypass (OPCAB) surgery. Pressure-volume loops have been shown to provide load-independent information of cardiac function. Therefore, the aim of this study was to investigate the feasibility of construction of right ventricular pressure-volume loops with pressure and volume data measured by a volumetric pulmonary artery catheter (PAC) and to evaluate right ventricular systolic and diastolic function by end-systolic elastance (E(ES)) and end-diastolic stiffness (E(ED)) in OPCAB surgery. Twenty-eight patients who underwent OPCAB surgery were included. After anesthesia induction, a volumetric PAC was placed via the right internal jugular vein. Data were recorded at: anesthesia steady-state before skin incision (T1); 5 minutes after the stabilizer device was placed for anastomosis on the heart's anterior wall (T2), lateral wall (T3), posterior wall (T4), respectively; after sternal closure (T5). Three sets of data were collected at each time point: first, hemodynamic variables were measured; second, right ventricular E(ES) and E(ED) were calculated; third, right ventricular pressure-volume loops were constructed with pr...Continue Reading

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