RT Journal Article
SR Electronic
T1 The inspiratory "squawk" in extrinsic allergic alveolitis and other pulmonary fibroses.
JF Thorax
JO Thorax
FD BMJ Publishing Group Ltd and British Thoracic Society
SP 923
OP 926
DO 10.1136/thx.37.12.923
VO 37
IS 12
A1 J E Earis
A1 K Marsh
A1 M G Pearson
A1 C M Ogilvie
YR 1982
UL http://thorax.bmj.com/content/37/12/923.abstract
AB An inspiratory musical sound ("squawk") was recorded in 14 patients with diffuse pulmonary fibrosis. These were divided into two groups: nine patients suffering from extrinsic allergic alveolitis (seven with bird fancier's lung and two with farmer's lung) and five patients with pulmonary fibrosis due to other causes, including rheumatoid disease, Wegener's granulomatosis, systemic sclerosis, and sarcoidosis. Clinical studies and phonopneumographic analysis of 10 consecutive squawks in each patient showed that the sound in the group with extrinsic allergic alveolitis was of shorter duration, occurred later in inspiration, and tended to be of higher frequency than the sound heard in the other group. Inspiratory crackles were present in all patients and in eight a single loud crackle preceded the squawk. We suggest that squawks, like crackles, result from the opening of airways and that the differences between the squawks in the two groups may reflect the size of the affected airways.