نتایج جستجو برای: peak inspiratory flow pif

تعداد نتایج: 613745  

Journal: :Journal of applied physiology 1997
B Kayser P Sliwinski S Yan M Tobiasz P T Macklem

Nine healthy subjects (age 31 +/- 4 yr) exercised with and without expiratory-flow limitation (maximal flow approximately 1 l/s). We monitored flow, end-tidal PCO2, esophageal (Pes) and gastric pressures, changes in end-expiratory lung volume, and perception (sensation) of difficulty in breathing. Subjects cycled at increasing intensity (+25 W/30 s) until symptom limitation. During the flow-lim...

Journal: :British journal of anaesthesia 1992
R Ooi P Joshi N Soni

We have compared an alternative breathing system for preoxygenation comprising a Hudson face mask with high oxygen inflow (48 litre min-1) and a Mapleson A breathing system (100 ml kg-1 min-1). The study consisted of two parts: the first involved adult volunteers (10 male, seven female) and the second part used a lung model for spontaneous ventilation with a sinusoidal ventilatory wave pattern....

Journal: :Respiration physiology 1998
R G Thomas P C LaStayo H Hoppeler R Favier G Ferretti B Kayser D Desplanches H Spielvogel S L Lindstedt

At the highest altitude, aerobic work is limited by environmental oxygen availability. We therefore reasoned that the hyperpnea associated with endurance training at altitude should provide a strong stimulus for adaptation of the ventilatory muscles. We measured peak inspiratory muscle pressure-flow characteristics (inspiring through graded resistors) and maximum sustainable ventilation capacit...

2014
C-H Yu P-L Su W-C Lin C-W Chen

BACKGROUND Late inspiratory rise in airway pressure (LIRAP, Paw/ΔT) caused by inspiratory muscle relaxation or expiratory muscle contraction is frequently seen during pressure support ventilation (PSV), although the modulating factors are unknown. METHODS We investigated the effects of respiratory mechanics (normal, obstructive, restrictive, or mixed), inspiratory effort (-2, -8, or -15 cm H2...

Journal: :Respiratory care 2016
Onnen Moerer Lars-Olav Harnisch Peter Herrmann Carsten Zippel Michael Quintel

BACKGROUND During noninvasive ventilation (NIV) of COPD patients, delayed off-cycling of pressure support can cause patient ventilator mismatch and NIV failure. This systematic experimental study analyzes the effects of varying cycling criteria on patient-ventilator interaction. METHODS A lung simulator with COPD settings was connected to an ICU ventilator via helmet or face mask. Cycling was...

2016
José Roberto Sostena Neto Letícia Magalhães Figueiredo e Castro Fernanda Santos de Oliveira Andréia Maria Silva Luciana Maria dos Reis Ana Paula Assunção Quirino Desanka Dragosavac Carolina Kosour

[Purpose] To compare the effects of two physiotherapy protocols for chronic kidney disease patients on dialysis. [Subjects and Methods] This is a prospective, randomized study, in chronic kidney disease patients 18 years of age or older on dialysis. Sessions for each group (were conducted three times per week for a total of 10 sessions), during hemodialysis. Respiratory muscle strength (maximal...

2017
Georg Boelke Uwe Berger Karl-Christian Bergmann Carsten Bindslev-Jensen Jean Bousquet Julia Gildemeister Marek Jutel Oliver Pfaar Torsten Sehlinger Torsten Zuberbier

BACKGROUND The GA2LEN chamber has been developed as a novel mobile allergen exposure chamber (AEC) allowing standardized multicenter trials in allergy. Hitherto, subjective nasal symptom scores have been the most often used outcome parameter, but in standardized modern trials objective parameters are preferred. Despite its practicability, the objective parameter peak nasal inspiratory flow (PNI...

Journal: :The European respiratory journal 2001
M E Broeders J Molema N A Vermue H T Folgering

Aerosol delivery depends on device design and inhalation technique. In vitro device evaluations have shown that the emitted dose and fine particle mass of dry powder inhalers (DPIs) increase at high peak inspiratory flow rates (PIFR). Since the PIFR is mostly achieved after the release of the powder, slope of the pressure profile is also described as an important determinant. The aim of the pre...

Journal: :The European respiratory journal 1997
S G Devadason M L Everard C MacEarlan C Roller Q A Summers P Swift L Borgstrom P N Le Souëf

Drug delivery to patients using dry powder inhalers, such as the Turbuhaler, is believed to be influenced by the inspiratory flow used. Clinical studies have indicated that this delivery system can be used effectively by children. However, it is not known how the total and weight-corrected dose delivered to the airways varies with age. A deposition study using technetium-99m (99mTc)-labelled bu...

Journal: :Journal of rehabilitation medicine 2008
Gabi Mueller Sonja de Groot Lucas van der Woude Maria T E Hopman

OBJECTIVE To investigate the time-courses of lung function and respiratory muscle pressure generating capacity after spinal cord injury. DESIGN Multi-centre, prospective cohort study. SUBJECTS One hundred and nine subjects with recent, motor complete spinal cord injury. METHODS Lung function and respiratory muscle pressure generating capacity were measured at first mobilization, at discha...

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