Effects of arterial pressure in an experimental isolated haemoperfused porcine kidney preservation system.
BACKGROUND
Normothermic preservation provides metabolic support to an ischaemically damaged organ before use as a kidney transplant. Optimal conditions for ex vivo preservation have not yet been established. This study examined the effects of arterial pressure on renal preservation using isolated haemoperfused kidneys.


METHODS
An isolated organ preservation system, developed using cardiopulmonary bypass technology, was used to perfuse porcine kidneys with normothermic oxygenated blood. Groups of kidneys (n = 6) were perfused at a mean arterial pressure of 95, 75 or 55 mmHg.


RESULTS
Kidneys perfused at the higher mean arterial pressures of 95 and 75 mmHg demonstrated improved renal function: mean(s.d.) area under the curve (AUC) for creatinine clearance 71(19) and 55(30) respectively versus 14(12) in the 55-mmHg group, P = 0.002; AUC for serum creatinine 938(140) and 1290(394) versus 2404(595), P = 0.003. The higher perfusion pressures were also associated with better acid-base homeostasis and improved renal haemodynamics.


CONCLUSIONS
Mean arterial pressures of either 95 or 75 mmHg were capable of sustaining physiological renal function, but kidneys in the 95-mmHg group demonstrated superior renal function overall.
Hosgood
S
S
Department of Cardiovascular Sciences, Transplant Group, University of Leicester, Leicester General Hospital, Leicester, UK.
Harper
S
S
Kay
M
M
Bagul
A
A
Waller
H
H
Nicholson
M L
ML