Acute surgical treatment of bleeding peptic ulcer. A retrospective analysis of 193 patients.

A retrospective analysis of 193 consecutive patients over an 11 year period operated on for continued bleeding from gastric or duodenal ulcer is presented. All patients were operated on within the first 48 hours after hospitalization. Preoperative endoscopic examination was performed in 108 patients and it was diagnostic in 79% of the cases.

Different analysis of frequency and amplitude modulations of a continuous tone in the human auditory cortex: a neuromagnetic study.

We have measured auditory evoked magnetic fields to intermittent frequency and amplitude modulations (FMs and AMs) of a continuous tone in 6 healthy humans. The stimuli were presented in pairs separated by 500 ms in four different combinations (FM-AM, FM-FM, AM-FM and AM-AM). Both modulations elicited neuromagnetic responses of similar waveforms: the largest deflection, N100m (magnetic counterpart of the electric N100), was preceded by a low amplitude P60m and followed by P200m.