Evaluation of spirometers used in pulmonary function studies.
1963; National Institutes of Health; Volume: 87; Linguagem: Inglês
10.1164/arrd.1963.87.2.228
AutoresRoss C. Kory, Lyle H. Hamilton,
Tópico(s)Respiratory Support and Mechanisms
ResumoIn 1951 Bernstein and Mendel (1) demonstrated with a mechanical pump system that recordings from the Knipping spirometer with its heavy metal bell were inaccurate at pump frequencies above 45 per minute. More recently Stead and associates (2) tested the Collins 13.5liter and 9-liter metal bell spirometers with a similar mechanical pump system and found inaccurate responses at rapid pump frequencies. As a result of their findings, these investigators designed a new spirometer with a reduced dead space and with a lightweight plastic bell. The writing pen was attached directly to this bell, and the pulley system and counterweight were eliminated (3). Stead and Wells demonstrated with a pistontype pump that their new spirometer measured the pump output at high frequencies more accurately than did either of the conventional Collins spirometers. No reports have appeared, however, in which the responses of these spirometers were compared in actual pulmonary function testing. In the present study, the SteadWells plastic bell spirometer was compared with the 9-liter and 13.5-liter Collins metal bell spirometers in ventilatory measurements of normal subjects and patients.
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