Coagulation tests in predicting haemorrhage after prostatic resection.

It is known that disseminated intravascular coagulation (DIC) can contribute towards blood loss after transurethral resection of the prostate because of the absorption of various prostatic substances. The aim of the present study was to establish whether simple coagulation tests (prothrombin time/activated partial thromboplastin time) carried out immediately after surgery would be useful in predicting those patients who bleed excessively after prostatic resection due to DIC. Criteria to determine significant post-operative haemorrhage were defined. Of 110 patients entered into the study, 34.5% had significant post-operative bleeding and 74% of these had an abnormal prothrombin time (> or = 15 s) immediately after surgery. An abnormal prothrombin time was associated with the resection of large prostates but could also predict the risk of bleeding independent of the resected weight; 18% of patients with an abnormal prothrombin time were also found to have an abnormal activated partial thromboplastin time and all of these had significant blood loss. A group of patients with an abnormal prothrombin time and a resected dry weight > or = 35 g was identified as a high risk group.