This child was referred for consultation because of a strange murmur. The murmur is best heard up left and varies with the position of the body. Echocardiography finding is normal, and prolapse, which was initially suspected, was not found. This periodically strong murmur that occurs in tact with heart beat resembles bronchial stridor on auscultation. Because of the child's young age the murmur could not be auscultated with the child holding his breath. The murmur varies with respiration, but does not disappear during expiration. Spectrogram shows a vibrating murmur resembling respiratory stridor that occurs end-systole and continues into early diastole. The murmur is probably caused by the hissing of air as the beating heart presses the wall of the bronchus in tact with the pulse. Interpreted as a cardiorespiratory murmur. Age 1.7 years, height 76.0 cm, weight 9.0 kg.