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Changes in respiratory resistance to low dose carbachol inhalation and to pneumatic trouser inflation are correlated

AM Lorino, F Lofaso, H Lorino, A Harf
European Respiratory Journal 1994 7: 2000-2004; DOI: 10.1183/09031936.94.07112000
AM Lorino
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F Lofaso
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H Lorino
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A Harf
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Abstract

Inflation of the leg compartments of pneumatic trousers increases thoracic blood volume. The resultant response in respiratory impedence was investigated in nine normal volunteers, and compared with the response to increasing doses of inhaled carbachol. Respiratory impedance was measured by the forced oscillation technique (4-32 Hz), and respiratory resistance at zero frequency (R0) was extrapolated from linear regression analysis of resistive impedance versus frequency. The mean increase in R0 was 31% after inhalation of 125 micrograms carbachol, and 21% after inflation of pneumatic trousers. The percentage changes in R0 following pneumatic trouser inflation highly correlated those induced by inhalation of 125 micrograms carbachol (r = 0.98) Our data demonstrate that, even in normal subjects, pneumatic trouser inflation causes an increase in respiratory resistance, which can be predicted by the response to a low dose of carbachol. These results support the assumption that cholinergic agents might not only be bronchoconstrictors but also vasodilators of the bronchial vessels. At a low dose, the vasodilating action of carbachol could be the major factor involved in the respiratory response.

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Changes in respiratory resistance to low dose carbachol inhalation and to pneumatic trouser inflation are correlated
AM Lorino, F Lofaso, H Lorino, A Harf
European Respiratory Journal Nov 1994, 7 (11) 2000-2004; DOI: 10.1183/09031936.94.07112000

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Changes in respiratory resistance to low dose carbachol inhalation and to pneumatic trouser inflation are correlated
AM Lorino, F Lofaso, H Lorino, A Harf
European Respiratory Journal Nov 1994, 7 (11) 2000-2004; DOI: 10.1183/09031936.94.07112000
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