Effects of pursed lip breathing on dyspnoea, physiological responses and sternomastoid muscle recruitment in patients with chronic obstructive pulmonary disease

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Effects of pursed lip breathing on dyspnoea, physiological responses and sternomastoid muscle recruitment in patients with chronic obstructive pulmonary disease

 

Author: Poon, Shun-kuk Pauline
Title: Effects of pursed lip breathing on dyspnoea, physiological responses and sternomastoid muscle recruitment in patients with chronic obstructive pulmonary disease
Degree: M.Sc.
Year: 2000
Subject: Lungs -- Diseases, Obstructive
Respiration
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Rehabilitation Sciences
Pages: xii, 88 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1541806
URI: http://theses.lib.polyu.edu.hk/handle/200/12
Abstract: Pursed lip breathing (PLB), the prolongation of expiration through pursed lips, is often used to improve the control of breathing and to relieve the dyspnoea sensation of patients with chronic obstructive pulmonary disease (COPD). Research on PLB has been focused on its effect on the physiological responses. Relatively few studies have used dyspnoea sensation and respiratory muscle recruitment to assess the efficacy of PLB. No study has so far been conducted to study its effect on acutely breathless patients with moderate to severe COPD. The purpose of this study was to investigate the effects of PLB on dyspnoea sensation, physiological responses and electromyographic activities of the sternomastoid muscle (EMG-SM) in acutely breathless patients with moderate to severe COPD. Thirteen patients with acute exacerbation of COPD with forced expiratory volume in the first second (FEV1) <70% of the predicted value (% predicted) were randomly assigned to two groups. The variables measured included subjective evaluation of dyspnoea using the modified Borg scale (MBS) and objective measurements on end-tidal carbon dioxide (ETCO2), SpO2, respiratory rate (RR), heart rate (HR) and EMG-SM. These variables were measured before and immediately after a spirometry test and at one minute intervals for four minutes after the spirometry test. During the four minutes, subjects in the PLB group (n=7) underwent a protocol of PLB whilst the control group (n=6) received no respiratory intervention. Comparisons of dyspnoea sensation, physiological responses and accessory inspiratory muscle recruitment, within and between the two groups, were carried out using the two-way repeated measures analysis of variance (ANOVA). The significance level was set at p<0.05. The results showed significant decrease in the dyspnoea sensation and RR between the control and PLB groups at the fourth minute post spirometry test (p=0.017 and 0.015 respectively). No significant differences were demonstrated in other variables. The results of the present study provide evidence that PLB is effective in relieving the dyspnoea sensation in patients with acute exacerbation of COPD.

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