Complications of jejunoileal bypass related to the excluded segment.

Dogs having a jejunoileal bypass, with the distal end of the bypassed segment being exteriorized as an ileal stoma, were compared with a control group having a Payne type jejunoileal bypass. In both groups, approximately 83 percent of the small intestine was bypassed. All except one dog survived the full six months of the study. During the first four months after the jejunoileal bypass, the dogs having an ileal stoma had more stable food consumption, less weight loss and higher levels of serum albumin than did those of the control group. During this period the bypassed segment in dogs of the control group usually contained bacteroides, whereas, after ileostomy, the segments were usually free of these organisms. At six months after jejunoileal bypass, there was no significant difference in the two groups with regard to nutrition, weight and the presence of bacteroides in the excluded segment. The hepatic structure and function was unaffected by both bypass procedures. Following a jejunoileal bypass in the dog, the complications associated with the excluded segment can be lessened by exteriorizing the distal end of the segment as a cutaneous ileal stoma.

Human exposure to sulfur dioxide and ozone: absence of a synergistic effect.

Studies of the human health effects of exposure to a combination of ozone and sulfur dioxide have produced somewhat conflicting results; the possibility of a synergistic enhancement of toxicity when the two gases are present simultaneously remains equivocal. We evaluated the effects of 0.40 ppm sulfur dioxide, 0.40 ppm ozone, and the combination of these two under one environmental condition (25 degrees C and 45% relative humidity). Subjects alternately walked and rested during a 2-hr exposure. Subjects exposed to filtered air or to 0.40 ppm sulfur dioxide showed no significant changes in pulmonary function. When exposed to either ozone or ozone plus sulfur dioxide, significant decreases in maximum expiratory flow, forced vital capacity, and inspiratory capacity were observed. There were no significant differences in response between ozone alone and ozone plus sulfur dioxide exposures, thus, in our subjects on synergistic effects were discernible.