Intra-abdominal pressure monitoring in liver transplant recipients:: a prospective study

Objective: No data are available on the incidence and clinical relevance of increased intra-abdominal pressure after orthotopic liver transplantation. This study assessed abdominal hypertension in a population of transplanted patients as this may be an important cofactor in early postoperative complications. Design and setting: Prospective clinical study in an intensive care unit of a national health system teaching hospital. Patients and measurements: Abdominal pressure was measured every 6 h using the urinary bladder method and was considered elevated when it was 25 mmHg or higher. Hemodynamic status was evaluated at the same times. Renal function was assessed on the basis of hourly urinary output by calculating serum creatinine on postoperative days 2 and 4 and the filtration gradient; patient outcomes were also considered. Results: Intra-abdominal hypertension was observed in 32% of cases; the subjects with high abdominal pressure had significantly lower mean artery pressure values but did not differ in terms of central venous pressure or cardiac output. High intra-abdominal pressure was more frequently associated with renal failure, a lower filtration gradient, delayed postsurgical weaning from ventilation, and a worse outcome. Conclusions: Abdominal hypertension is frequent after liver transplantation and may be associated with a complicated post-operative course.