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No evidence of cardiac stunning or decoupling immediately after cardiopulmonary bypass for elective coronary surgery
Author(s) -
Dybos Tannvik Tomas,
Kiss Gabriel,
Torp Hans,
Eskeland Rimehaug Audun,
KirkebyGarstad Idar
Publication year - 2020
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/aas.13621
Subject(s) - medicine , cardiopulmonary bypass , contractility , cardiology , hemodynamics , myocardial stunning , anesthesia , coronary artery bypass surgery , stroke volume , artery , cardiac surgery , ischemia , ejection fraction , heart failure
Background There is significant uncertainty regarding the timing of onset of cardiovascular stunning after cardiac surgery. Cardiovascular stunning is affecting both contractility (Ees) and arterial load. Arterial load may be represented by arterial elastance (Ea) and participates in ventriculo‐arterial coupling through the Ea/Ees ratio, giving information on efficiency and performance. An alternative approach to ventriculo‐arterial interaction is oscillatory power fraction (OPF). The aim of this study was to investigate the immediate beat‐to‐beat effects of on‐pump coronary artery bypass graft (CABG) surgery on contractility, cardiac power parameters, arterial load and ventriculo‐arterial coupling as well as classical haemodynamic parameters. Methods We included 41 patients scheduled for fast‐track CABG surgery. Measurements were taken before and after cardiopulmonary bypass. A flow and pressure curve were recorded from transoesophageal pulsed wave Doppler and a radial artery catheter, respectively. This enabled the calculation of stroke work, total cardiac energy delivery, OPF and Ea/Ees ratio. Routine haemodynamic monitoring provided the classical haemodynamic parameters. Results Immediately after cardiopulmonary bypass there was no firm evidence for alterations in contractility, stroke work, stroke volume or arterial elastance. Ea/Ees ratio and OPF remained unchanged. Conclusions There was no evidence for clinically relevant cardiac stunning or altered arterial load immediately after cardiopulmonary bypass for CABG surgery. The unchanged Ea/Ees ratio and OPF are indicating unchanged cardiac efficiency before and after cardiopulmonary bypass. This indicates that in elective CABG patients cardiovascular stunning is perhaps a phenomenon of inflammation and not immediate ischaemia–reperfusion injury or mechanical handling.