Document Detail

Assessment of right ventricular function by pressure-volume loops in off-pump coronary artery bypass surgery.
MedLine Citation:
PMID:  18706209     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: 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. METHODS: 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 pressure and volume data measured from end-diastole point, end-isovolumic systole point, peak-ejection point, end-systole point and end-isovolumic diastole point. RESULTS: Right ventricular pressure-volume loops generally shifted to the left during OPCAB surgery. Especially, the end-diastolic point shifted upward and to the left at T2-T5 compared with that at T1. Decrease in right ventricular ejection fraction, stroke volume index and end-diastolic volume index occurred (P < 0.05) at T4 compared with values at T1. Pulmonary vascular resistance index at T4 increased relatively compared with that at T2 and T3. The change of E(ES) was not statistically significant during operation. Right atrial pressure increased only during coronary anastomoses (T2-T4, P < 0.05), whereas E(ED) increased throughout OPCAB surgery (P < 0.05). CONCLUSIONS: Right ventricular pressure-volume loops can be constructed using a volumetric PAC. Right ventricular systolic dysfunction occurred during anastomoses on the heart's posterior wall not due to impaired myocardial contractility but as a result of reduced preload and a relative increase in afterload. Right ventricular diastolic function was impaired throughout OPCAB surgery.
Hong-wei Zhao; An-shi Wu; Yu Liu; Yan Rui; Di Wu; Juan Liu; Qiu-hua Zhao; Shu-rong Guo; Yong-qian Zhang; Yun Yue
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Chinese medical journal     Volume:  121     ISSN:  0366-6999     ISO Abbreviation:  Chin. Med. J.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-08-18     Completed Date:  2008-11-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7513795     Medline TA:  Chin Med J (Engl)     Country:  China    
Other Details:
Languages:  eng     Pagination:  932-8     Citation Subset:  IM    
Department of Anesthesiology, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China.
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MeSH Terms
Blood Pressure
Coronary Artery Bypass, Off-Pump / methods*
Middle Aged
Ventricular Function, Right / physiology*

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