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To the Editor:—
Recently a simple maneuver has been observed to end prolonged hiccupping in a dozen subjects. The individual is instructed to sit upright and to hold his breath. The patient then maximally extends his head for 10 to 15 seconds or as long as he can hold his breath. This maneuver tends to hold the diaphragm in a relatively fixed position particularly if the breath is held in inspiration. The mechanism appears to be the fixation of the anterior wall of the abdominal musculature which occurs when the head is hyperextended. Interference with diaphragmatic motion by this
Lawrence V. Perlman. A Simple Maneuver to Treat Hiccups. JAMA. 1967;202(3):245–246. doi:10.1001/jama.1967.03130160119039