[Effects of street noise on plasma catecholamines, cyclic AMP and various cardiovascular and metabolic functions in a group of normal subjects].

Exposure to traffic noise for ten minutes increased diastolic pressure without affecting systolic pressure and heart rate. Plasma catecholamine levels were enhanced only five minutes after noise stimulation. Noradrenaline increased more significantly than dopamine and adrenaline.

[Rupture of the chordae tendineae and mitral prolapse. General considerations and description of a case].

A severe case of acute mitral insufficiency caused by a ruptured tendinous cord is described. The subject had an unrecognised mitral prolapse and had been suffering from tachycardia for years when an attack of pulmonary oedema occurred some days after apparently well tolerated exertion. The phenomena behind the event are discussed with particular reference to the mechanisms, closure and distribution of prolapses in so-called mixamatosic degeneration of the valve.