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Liver blood flow during cardiac surgery
Govind Chetty1, David A C Sharpe, Jay Nandi
1Department of Cardiothoracic Surgery, Blackpool Victoria Hospital, Blackpool, UK.
Perfusion
|August 10, 2004
Summary
Cardiac surgery significantly reduces liver blood flow during cardiopulmonary bypass. However, liver blood flow returns to normal within hours and remains stable for 24 hours post-surgery.
Area of Science:
- Cardiology
- Hepatology
- Anesthesiology
Background:
- Liver blood flow is critical for metabolic and drug metabolism functions.
- Impaired liver blood flow can lead to short-term complications.
- Understanding liver blood flow changes during cardiac surgery is essential.
Purpose of the Study:
- To quantify the impact of cardiac surgery on liver blood flow.
- To assess liver blood flow from anesthesia induction to 24 hours post-operation.
Main Methods:
- Study included 10 patients undergoing coronary artery bypass graft surgery.
- Liver blood flow measured using indocyanine green (ICG) clearance.
- Expressed as percentage disappearance rate (PDR) over time.
Main Results:
- A significant reduction in PDR was observed during cardiopulmonary bypass (13.51%/min).
- Baseline PDR (19.84%/min) was restored before extubation and maintained for 24 hours.
- Anesthesia induction and positive pressure ventilation did not affect liver blood flow.
Conclusions:
- Cardiopulmonary bypass at 30°C significantly reduces liver blood flow.
- Liver blood flow recovers within 4-6 hours post-surgery.
- Anesthesia and ventilation do not adversely affect liver blood flow.