Tussiphonogram in probands with chronic obstructive bronchitis.

Tussiphonographic examinations were conducted in 21 probands admitted to hospital with chronic bronchitis, diagnosed by spirometry. Voluntary cough registered in subjects with obstructive chronic bronchitis appeared in the recordings as a marked multifarious sound, an increased mono-sound or a connected double-sound. The average value of cough sound intensity was increased to 244%, and the duration of cough was delayed to 77% when compared to normal values. No correlation was found between the changes observed in spirometric values, and values indicated by the tussiphonogram.