2Blood Bank, Leeds Teaching Hospitals NHS Trust, Leeds, UK This case showed that it is possible for haemoglobin released by haemolysis in the extracorporeal circuit to pass through a high permeability (albumin retaining) dialyser membrane. In the incident described, the blood leak detector of the dialysis machine was activated before the patient became symptomatic. Haemolysis should be considered as a possible cause of blood leak alarms during dialysis with high flux membranes

A retrospective 10-year experience with the traditional three-stage plan (diverting colostomy, resection, colostomy closure) for perforated diverticulitis of the colon in four urban hospitals was reviewed to accurately assess the mortality rate. Only patients who were admitted in a non-elective manner with signs of an acute abdomen or who were already hospitalized with another illness and developed an acute abdomen were considered. Fecal or generalized purulent peritonitis, or pelvic peritonitis with abscess were observed at laparotomy in all instances. Two hundred and eight patients representing 211 episodes met the above stated criteria for inclusion in the study. A transverse colostomy was performed in 203 instances associated with 16 deaths, and 8 sigmoid colostomies were associated with two deaths. The overall mortality after the first stage was 8.5%. A loop colostomy was constructed most frequently and a completely divided colostomy performed in only 31 of 211 (15%) instances. Of 147 instances in which the diseased sigmoid colon was resected, 44 (30%) had the colostomy ablated at the same operation, resulting in only one death (0.7% mortality). Colostomy closure as a separate procedure in 103 instances resulted in 4 deaths (3.9% mortality). The highest mortality rate occurred in patients in the in the eighth decade. Staged procedures for perforated colonic diverticula can be carried out with a mortality rate of 11%.