British Journal of Anaesthesia, Vol 81, Issue 3 311-316, Copyright © 1998 by The Board of Management and Trustees of the British Journal of Anaesthesia
T. S. Walsh, P. Hopton, O. J. Garden and A. Lee
We have documented the changes in gas exchange, haemodynamic state and
associated physiological variables which occurred after graft reperfusion
in 20 patients undergoing uncomplicated orthotopic liver transplantation.
Gas exchange was measured during constant ventilation using a metabolic
monitor. After reperfusion, there were increases in VO2 (mean increase 57
(SD 25) ml min-1) (P < 0.001), VCO2 (mean increase 38 (17) ml min-1) (P
< 0.001) and PaCO2 (mean increase 0.88 (0.56) kPa) (P < 0.001). These
were associated with increases in cardiac output (1.2 (1.0) litre min-1
m-2) (P < 0.001) and mean pulmonary artery pressure (9 (6) mm Hg) (P
< 0.001). There was a decrease in standard bicarbonate concentration
(0.96 (1.6) mmol litre- 1) (P < 0.02) and increase in hydrogen ion
concentration (8.15 (5.9) mmol litre-1) (P < 0.001) consistent with the
release of an acid load from the graft and previously ischaemic tissues.
The increases in PaCO2 and hydrogen ion concentration were significantly
larger in patients in whom venovenous bypass was used during the anhepatic
period compared with the "piggyback" surgical technique. We found
correlations between the changes in PaCO2 and VCO2 (r2 = 0.25, P <
0.02), cardiac output and VCO2 (r2 = 0.34, P < 0.01), and cardiac output
and VO2 (r2 = 0.34, P < 0.01). We conclude that major alterations in gas
exchange occur after reperfusion which result from alterations in metabolic
rate and haemodynamic changes. These may be clinically relevant,
particularly in patients at risk of cerebral oedema.
CLINICAL INVESTIGATIONS
Effect of graft reperfusion on haemodynamics and gas exchange during liver transplantation
Departments of Anaesthetics and Surgery, Royal Infirmary of Edinburgh, 1 Lauriston Place, Edinburgh, EH3 9YW; Scottish Liver Transplant Unit, Royal Infirmary of Edinburgh, 1 Lauriston Place, Edinburgh, EH3 9YW
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