OBJECTIVES: To evaluate effects of meals in difficult-to-wean tracheostomised patients with chronic obstructive pulmonary diseases during spontaneous breathing or Inspiratory Pressure Support. DESIGN: Prospective, crossover, randomised, and physiological study. SETTING: Weaning centre. PATIENTS: Sixteen COPD undergoing either decreasing levels of pressure support or increasing periods of spontaneous breathing. MEASUREMENTS: Each patient underwent monitoring during a 30-min procedure, during and after meals either under pressure support or spontaneous breathing on two consecutive days. Inductance plethysmography was used to monitor respiratory rate and tidal volume. Tidal volume by a flow transducer, arterial oxygen saturation, pulse rate, end-tidal CO2(,) and dyspnoea by a visual analogue scale were also assessed. RESULTS: ANOVA analysis showed a significant increase under spontaneous breathing for respiratory rate (P<0.001) and for end tidal CO(2) (P<0.03) induced by the meals. Inspiratory pressure support was associated to significantly greater tidal volume (P<0.001), lower respiratory rate (P<0.032), lower respiratory rate/tidal volume (P<0.001), and lower pulse rate (P<0.047) than spontaneous breathing. Under spontaneous breathing but not under pressure support a statistically worsening in meal-induced dispnoea (P<0.001) was found. CONCLUSIONS: In tracheostomised difficult-to-wean COPD patients: 1) under unassisted breathing, meals may induce an increase in respiratory rate, end-tidal CO(2), and dyspnoea; 2) inspiratory pressure support ventilation prevents dyspnoea from worsening during meals.
RCT Entities:
OBJECTIVES: To evaluate effects of meals in difficult-to-wean tracheostomised patients with chronic obstructive pulmonary diseases during spontaneous breathing or Inspiratory Pressure Support. DESIGN: Prospective, crossover, randomised, and physiological study. SETTING: Weaning centre. PATIENTS: Sixteen COPD undergoing either decreasing levels of pressure support or increasing periods of spontaneous breathing. MEASUREMENTS: Each patient underwent monitoring during a 30-min procedure, during and after meals either under pressure support or spontaneous breathing on two consecutive days. Inductance plethysmography was used to monitor respiratory rate and tidal volume. Tidal volume by a flow transducer, arterial oxygen saturation, pulse rate, end-tidal CO2(,) and dyspnoea by a visual analogue scale were also assessed. RESULTS: ANOVA analysis showed a significant increase under spontaneous breathing for respiratory rate (P<0.001) and for end tidal CO(2) (P<0.03) induced by the meals. Inspiratory pressure support was associated to significantly greater tidal volume (P<0.001), lower respiratory rate (P<0.032), lower respiratory rate/tidal volume (P<0.001), and lower pulse rate (P<0.047) than spontaneous breathing. Under spontaneous breathing but not under pressure support a statistically worsening in meal-induced dispnoea (P<0.001) was found. CONCLUSIONS: In tracheostomised difficult-to-wean COPDpatients: 1) under unassisted breathing, meals may induce an increase in respiratory rate, end-tidal CO(2), and dyspnoea; 2) inspiratory pressure support ventilation prevents dyspnoea from worsening during meals.
Authors: Jeroen J W Liesker; Peter J Wijkstra; Nick H T Ten Hacken; Gerard H Koëter; Dirkje S Postma; Huib A M Kerstjens Journal: Chest Date: 2002-02 Impact factor: 9.410
Authors: M Vitacca; A Vianello; D Colombo; E Clini; R Porta; L Bianchi; G Arcaro; G Vitale; E Guffanti; A Lo Coco; N Ambrosino Journal: Am J Respir Crit Care Med Date: 2001-07-15 Impact factor: 21.405
Authors: Peter Andrews; Elie Azoulay; Massimo Antonelli; Laurent Brochard; Christian Brun-Buisson; Daniel de Backer; Geoffrey Dobb; Jean-Yves Fagon; Herwig Gerlach; Johan Groeneveld; Jordi Mancebo; Philipp Metnitz; Stefano Nava; Jerome Pugin; Michael Pinsky; Peter Radermacher; Christian Richard; Robert Tasker Journal: Intensive Care Med Date: 2006-02-01 Impact factor: 17.440