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after a reasonable trial of the usual non-operative procedures ; for example, gastric lavage, rectal injections of gas or water in the knee-chest position, massage, or gentle manipulation with full narcosis. A cure by spontaneous disinvaginatiou or sloughing of the invaginated segment is no more to be expected than in a strangulated hernia. Rydygier operates after two unsuccessful attempts at reduction by rectal injections of water, in acute cases, as soon as possible. After laparotomy has beendoi:10.1056/nejm189708191370808 fatcat:j24j45xaw5f4nmnoq2argajfba