For measuring air usage during phonation, we recorded the air volume curve as a function of time during sustained phonation by using a spirometer coupled with a simple electrical device. As an indirect estimation of air usage, the phonation quotient (PQ) was also calculated from the vital capacity (VC) and the maximum phonation time (MPT) ; PQ=VC/MPT. This paper reports on a comparative study o...

Spirometric variables were obtained from nine symptomless subjects, who performed forced expiratory manoeuvres with three Vitalograph spirometers at three different ambient temperatures (36.5 degrees C, 24.1 degrees C, and - 7.3 degrees C) over three days according to a Latin square design. Analysis of variance showed no significant difference between values at different ambient temperatures wh...

The noninvasive measurement of infant lung function during unsedated sleep in infants has been a long-standing objective in paediatric respiratory medicine. This note reports on the design and performance of a head-out volume-displacement plethysmograph (VDP) that overcomes some of the limitations of traditional lung function apparatus. The VDP comprises a rigid acrylic box with an integral wat...

OBJECTIVE AND BACKGROUND Spirometry is recommended for the diagnosis and management of chronic respiratory diseases in the community. Spirometer accuracy is critical, but few general practitioners meet the American Thoracic Society and European Respiratory Society (ATS/ERS) recommendation for daily calibration. The aim of this study was to assess the accuracy and stability of a portable ultraso...

Forced expiratory volume (FEV1) and forced vital capacity (FVC) were measured in nine normal subjects with three Vitalograph and three rolling seal spirometers at three different ambient temperatures (4 degrees C, 22 degrees C, 32 degrees C). When the results obtained with the rolling seal spirometer were converted to BTPS the agreement between measurements in the three environments improved, b...

BACKGROUND Currently is not feasible using conventional spirometry as a screening method in Primary Care especially among smoking population to detect chronic obstructive pulmonary disease in early stages. Therefore, the FUMEPOC study protocol intends to analyze the validity and reliability of Vitalograph COPD-6 spirometer as simpler tool to aid screening and diagnosis of this disease in early ...

The adult (Wright) respirometer has been redesigned for neonates. A calibrated Krogh spirometer has been used to check the accuracy and a regression relationship derived over a range of minute volumes 0.4-2.8 l./min. The added resistance of 29 cm H,O/ l./sec lowered minute volume according to a second regression line which was also experimentally derived. Combining the two regressions allows tr...

Since the introduction of this test by Hermannsen (1933), the measurement of maximum breathing capacity (M.B.C.) on different groups of subjects has been reported on several occasions (for example, Gray and Green, 1945; Baldwin, Cournand, and Richards, 1948; Wright, Yee, Filley, and Stranahan, 1949; and Gilson and Hugh-Jones, 1949). Most investigators have performed this test with a spirometer,...

at the final stages of a coronary artery bypass graft operation on a 64-year-old man, an experienced physician attempted to insert an intra-aortic balloon pump into the femoral artery via the seldinger technique. however, while the balloon pump was being passed over the guide wire, the latter was completely lost. the guide wire should be held at the tip at all times to prevent passage into the ...

OBJECTIVE To compare the diaphragmatic mobility of healthy subjects during incentive spirometry with a volume-oriented device, during incentive spirometry with a flow-oriented device, and during diaphragmatic breathing. To compare men and women in terms of diaphragmatic mobility during these three types of breathing exercises. METHODS We evaluated the pulmonary function and diaphragmatic mobi...