title: Peak inspiratory flow rates generated through the Novolizer and the Turbuhaler dry powder inhaler devices by children with stable asthma.
abstract: We compared the peak inspiratory flows (PIF) generated through a novel dry powder inhaler device, the Novolizer (PIF-N), and the Turbuhaler (PIF-T). Forty-six pediatric patients with stable bronchial asthma were randomized in an open-label, multicenter, crossover trial. No drug was administered during the inhalation maneuvers that were spaced by 10 min. There was neither a carryover nor a sequence effect. The patients were characterized by mean age of 8.5 years, mean FEV(1) of 1.79 L, and mean PIF without any device (baseline, PIF-B) of 185 L/min. Through the devices mean PIF-N of 94 L/min and mean PIF-T of 69 L/min were achieved, calculated from the maxima of three inhalations. This resulted in p < 0.0001 for the difference. The median PIFN/PIF-T ratio was estimated as 1.39. Each child achieved a higher PIF-N than PIF-T and was able to release the feedback mechanisms of the Novolizer indicating sufficient inhalation performance. We conclude that the PIF through the Novolizer is higher than the PIF through the Turbuhaler in stable asthmatic children. The flow rates achieved through the Novolizer allow for sufficient lung deposition even in children as young as 6 years.
authors: Research Institute for Prevention of Childrens' Allergy and Respiratory Diseases, Marien-Hospital, Wesel, Germany. vonberg@marien-hospital-wesel.de
authors: Andrea
authors: A
authors: von Berg
authors: Hans-Joachim
authors: HJ
authors: Kremer
authors: Barbara
authors: B
authors: Ellers-Lenz
authors: Frank
authors: F
authors: Conrad
authors: Katharina
authors: K
authors: Erb
authors: Joachim
authors: J
authors: Maus
authors: Robert
authors: R
authors: Hermann
mesh_terms: D000336:Aerosols; D001249:Asthma / Q000188:drug therapy; D001993:Bronchodilator Agents / Q000008:administration & dosage; D002648:Child; D018592:Cross-Over Studies; D004867:Equipment Design; D005246:Feedback; D005260:Female; D005541:Forced Expiratory Volume / Q000187:drug effects; D006801:Humans; D001239:Inhalation / Q000502:physiology*; D008297:Male; D036501:Metered Dose Inhalers; D009048:Motor Skills / Q000502:physiology; D011208:Powders; D012212:Rheology
chemical_list: D000336:Aerosols; D001993:Bronchodilator Agents; D011208:Powders