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Bronchodilator delivery by metered-dose inhaler in mechanically ventilated COPD patients: influence of flow pattern

E Mouloudi, G Prinianakis, E Kondili, D Georgopoulos
European Respiratory Journal 2000 16: 263-268; DOI:
E Mouloudi
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G Prinianakis
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E Kondili
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D Georgopoulos
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Abstract

In mechanically ventilated patients the flow pattern during bronchodilator delivery by metered-dose inhaler (MDI) could be a factor that might influence the effectiveness of this therapy. In order to test this the effect of two different inspiratory flow patterns on the bronchodilation induced by beta2-agonists administered via MDI and spacer in a group of mechanically ventilated patients with chronic obstructive pulmonary disease (COPD) was examined. Eighteen mechanically ventilated patients with COPD, were prospectively randomized to receive two (n=8, protocol A) or six (n=10 protocol B) puffs salbutamol (100 microg x puff(-1)) either under pressure control (decelerating flow pattern) or under volume control (square wave flow pattern). With both modes, tidal volume and inspiratory time were identical. Salbutamol was administered via an MDI adapted to the inspiratory limb of the ventilator circuit using an aerosol cloud-enhancer spacer. After a 6-h washout, patients were crossed over to receive the same dose of salbutamol (200 or 600 microg, respectively in protocols A and B) by the alternative mode of administration. Static and dynamic airway pressures, minimum (Rint) and maximum (Rrs) inspiratory resistance and the difference between Rrs and Rint (deltaR) were measured before and at 15, 30 and 60 min after salbutamol. Independent of the dose, salbutamol caused a significant decrease in dynamic and static airway pressures, Rint and Rrs. These changes were not influenced by the inspiratory flow pattern and were evident at 15, 30 and 60 min after salbutamol. It is concluded that salbutamol delivered via metered dose inhaler and spacer device, induces significant bronchodilation in mechanically ventilated patients with chronic obstructive pulmonary disease, the magnitude of which is not affected by the inspiratory flow/time profile.

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Bronchodilator delivery by metered-dose inhaler in mechanically ventilated COPD patients: influence of flow pattern
E Mouloudi, G Prinianakis, E Kondili, D Georgopoulos
European Respiratory Journal Aug 2000, 16 (2) 263-268;

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Bronchodilator delivery by metered-dose inhaler in mechanically ventilated COPD patients: influence of flow pattern
E Mouloudi, G Prinianakis, E Kondili, D Georgopoulos
European Respiratory Journal Aug 2000, 16 (2) 263-268;
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