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Effects of intravenous broxaterol on respiratory drive and neuromuscular coupling in COPD patients

F Gigliotti, G Gurrieri, R Duranti, M Gorini, G Scano
European Respiratory Journal 1993 6: 371-377; DOI:
F Gigliotti
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G Gurrieri
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R Duranti
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M Gorini
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G Scano
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Abstract

Broxaterol, a new selective beta 2-agonist, has been shown to exert inotropic effects on both fresh and fatigued canine diaphragm. We evaluated the effect of broxaterol on the activation and force output of the respiratory muscles in patients with chronic obstructive pulmonary disease (COPD). We studied 9 patients with moderate to severe COPD. Each patient was infused with saline and Broxaterol (200 micrograms) in saline alternately. We measured lung volumes, maximal inspiratory pressure (MIP), maximal expiratory pressure (MEP), breathing pattern, P0.1, respiratory muscle EMG (diaphragm, EMGd, and parasternal, EMGp) and P0.1/EMGd ratio. Measurements were made under control conditions and at 15, 30, 60, and 120 min after each infusion. Broxaterol, but not saline, resulted in a slight but significant increase in vital capacity (VC), forced expiratory volume in one second (FEV1) and MIP, and a decrease in functional residual capacity (FRC). Breathing pattern did not change, while EMG significantly decreased, and P0.1/EMGd significantly increased in 5 of the 9 patients after broxaterol. These data seem to indicate that by partially unloading the respiratory muscles, broxaterol results in decreased muscle activation (EMG). Increase in chest wall neuromuscular coupling (P0.1/EMGd) may also be observed.

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Effects of intravenous broxaterol on respiratory drive and neuromuscular coupling in COPD patients
F Gigliotti, G Gurrieri, R Duranti, M Gorini, G Scano
European Respiratory Journal Mar 1993, 6 (3) 371-377;

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Effects of intravenous broxaterol on respiratory drive and neuromuscular coupling in COPD patients
F Gigliotti, G Gurrieri, R Duranti, M Gorini, G Scano
European Respiratory Journal Mar 1993, 6 (3) 371-377;
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