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An experience with surgical treatment for atrial septal defects in 59 patients has given evidence as to the safety and efficacy of the procedure utilizing the atrial-well technic. Data from the first 33 cases of this series are presented in detail, to allow analysis by others of the basis for these conclusions.

A complication of right heart catheterization is reported in which the catheter became knotted and entangled in the chordae tendineae of the tricuspid valve. Removal required open cardiotomy with hypothermia and temporary inflow occlusion.

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