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Diagnostic abdominal paracentesis and lavage: experimental and clinical evaluations in the dog.

Diagnostic abdominal paracentesis and saline lavage, using a peritoneal dialysis catheter, was evaluated experimentally and clinically in dogs. Use of the catheter enabled detection of abdominal fluid in volumes as low as 0.2 ml/kg of body weight. In paracentesis, the catheter proved to be a more reliable means of detecting hemoperitoneum than did a needle. In 14 clinical cases of blunt trauma, use of the catheter provided reliable evidence of intraabdominal injury.