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Biomedical subjects

H O Conn

Publications and source records attributed to H O Conn.

At least 109 records · Page 6Linked to original sources

Spontaneous bacterial peritonitis induced by intraarterial vasopressin therapy.

Two patients developed spontaneous bacterial peritonitis after infusions of vasopressin into the superior mesenteric or gastroduodenal arteries for upper gastrointestinal hemorrhage. The peritonitis in these patients differed from the typical picture in which a single aerobic organism is responsible, by the presence of multiple organisms, some of which were anaerobic. These findings suggest that the arterial vasoconstriction decreased the integrity of the intestinal mucosal barrier and permitted the transmural migration of enteric organisms from the lumen of the bowel into the ascites-filled peritoneal cavity.

Anaerobiosis↗

A statistical analysis of reviewer agreement and bias in evaluating medical abstracts.

Observer variability affects virtually all aspects of clinical medicine and investigation. One important aspect, not previously examined, is the selection of abstracts for presentation at national medical meetings. In the present study, 109 abstracts, submitted to the American Association for the Study of Liver Disease, were evaluated by three "blind" reviewers for originality, design-execution, importance, and overall scientific merit. Of the 77 abstracts rated for all parameters by all observers, interobserver agreement ranged between 81 and 88%. However, corresponding intraclass correlations varied between 0.16 (approaching statistical significance) and 0.37 (p < 0.01). Specific tests of systematic differences in scoring revealed statistically significant levels of observer bias on most of the abstract components. Moreover, the mean differences in interobserver ratings were quite small compared to the standard deviations of these differences. These results emphasize the importance of evaluating the simple percentage of rater agreement within the broader context of observer variability and systematic bias.

Abstracting and Indexing↗

Portacaval anastomosis and peptic ulcer: a nonassociation.

The incidence of peptic ulcer is increased in cirrhosis and is widely believed to be even greater in cirrhotic patients with portacaval anastomosis (PCA). Two prospective, controlled investigations of prophylactic PCA were evaluated to compare the frequency of peptic ulcer in two groups of cirrhotic patients with similar clinical and laboratory manifestations of cirrhosis randomly selected to be an unoperated Control Group (60 patients) or to have PCA (Shunt Group, 48 patients). In addition, nonrandomized groups of cirrhotic patients, 77 of whom were excluded from the randomized study and 44 of whom had therapeutic PCA, were studied. A diagnosis of chronic peptic ulcer was based on the demonstration of an ulcer crater by X-ray, endoscopy, surgery, or autopsy. Prior to inclusion in these studies, approximately 10% of patients had had peptic ulcer. After inclusion, during a mean follow-up period of 45 months, 12% of both the Control and Shunt Groups developed peptic ulcers. The frequency of complications of peptic ulcer, of recurrence of peptic ulcer, or of acute or symptomatic (unproved) ulcer were similar in both groups. Ulcers tended to develop later in shunted than in unshunted patients. Similar data were obtained from three of four other controlled investigations of PCA. This investigation does not find an increased occurrence of peptic ulcer after PCA. The frequency of ulcer in cirrhosis appears to increase with the duration of the disease independent of the presence or absence of PCA.

Autopsy↗

Intraarterial vasopressin in the treatment of upper gastrointestinal hemorrhage: a prospective, controlled clinical trial.

Intraarterial vasopressin has been reported to be effective in the treatment of massive upper gastrointestinal hemorrhage. A prospective, controlled clinical trial comparing conventional treatment with conventional therapy plus intraarterial vasopressin was undertaken. Sixty episodes of upper gastrointestinal hemorrhage were evaluated during a 40-month period; 32 received conventional and 28 conventional plus vasopressin therapy. The two groups of patients were similar in type and severity of their bleeding lesions and in their underlying diseases. Vasopressin was more effective in controlling hemorrhage from nonvariceal lesions (P less than 0.05) and from varices (P less than 0.01) than conventional therapy. Transfusion requirements were significantly reduced in those patients who received vasopressin. Paradoxically, survival was not affected by vasopressin administration. The failure of cessation of hemorrhage to improve survival is thought to be due to the degree of advancement of the underlying disease, to the torrential nature of the hemorrhage, to the frequency of recurrent hemorrhage, and to the use of intraarterial vasopressin in some patients in the conventional treatment group in whom conventional therapy had failed.

Adult↗