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Cerebral perfusion during human liver transplantation
F Pott1, F S Larsen, E Ejlersen
1Copenhagen Muscle Research Centre, Department of Anaesthesia, Rigshospitalet, University of Copenhagen, Denmark.
Clinical Physiology (Oxford, England)
|March 1, 1995
Summary
Liver transplant surgery impacts cerebral perfusion. During the anhepatic phase, stable blood pressure maintained cerebral blood flow, while reperfusion increased it with higher carbon dioxide levels.
Area of Science:
- Neurosurgery
- Hepatology
- Transplant Surgery
Background:
- Liver transplantation is a complex procedure with potential hemodynamic and cerebral perfusion implications.
- Monitoring cerebral perfusion during liver transplantation is crucial for patient outcomes.
Purpose of the Study:
- To investigate changes in cerebral perfusion during liver transplantation using transcranial Doppler.
- To compare cerebral perfusion in patients with fulminant hepatic failure versus chronic liver disease undergoing liver transplantation.
Main Methods:
- Cerebral perfusion was monitored using middle cerebral artery mean flow velocity (Vmean) and pulsatility index (PI) via transcranial Doppler.
- Hemodynamic variables were recorded during preanhepatic, anhepatic, and reperfusion phases in two patient groups.
- Thoracic electrical impedance (TI) monitored central blood volume, while arterial carbon dioxide tension (PaCO2) was also measured.
Main Results:
- Cerebral perfusion indicators (Vmean, PI) and central hemodynamics remained stable during the anhepatic phase, with constant TI indicating maintained blood volume.
- Cardiac output (CO) and stroke volume (SV) decreased during the anhepatic phase (P < 0.05).
- Reperfusion led to increased CO, SV, PaCO2, Vmean, and PI, indicating elevated cerebral perfusion and carbon dioxide tension.
Conclusions:
- Stable blood pressure and maintained central blood volume during the anhepatic phase of liver transplantation support stable cerebral perfusion.
- Graft revascularization during liver transplantation significantly increases cerebral perfusion and is associated with elevated carbon dioxide tension.