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Meta-Analysis
. 2013 Jul 23;2013(7):CD008507.
doi: 10.1002/14651858.CD008507.pub2.

Respiratory muscle training for cervical spinal cord injury

David J Berlowitz  1 , Jeanette Tamplin
Affiliations
Meta-Analysis

Respiratory muscle training for cervical spinal cord injury

David J Berlowitz et al. Cochrane Database Syst Rev. .

Abstract

Background: Cervical spinal cord injury (SCI) severely comprises respiratory function due to paralysis and impairment of the respiratory muscles. Various types of respiratory muscle training (RMT) to improve respiratory function for people with cervical SCI have been described in the literature. A systematic review of this literature is needed to determine the effectiveness of RMT (either inspiratory or expiratory muscle training) on pulmonary function, dyspnoea, respiratory complications, respiratory muscle strength, and quality of life for people with cervical SCI.

Objectives: To evaluate the efficacy of RMT versus standard care or sham treatments in people with cervical SCI.

Search methods: We searched the Cochrane Injuries and Cochrane Neuromuscular Disease Groups' Specialised Register, the Cochrane Central Register of Controlled Trials (CENTRAL) (2012, Issue 1), MEDLINE, EMBASE, CINAHL, ISI Web of Science, PubMed, and clinical trials registries (Australian New Zealand Clinical Trials Registry, ClinicalTrials, Controlled Trials metaRegister) on 5 to 8 March 2013. We handsearched reference lists of relevant papers and literature reviews. We applied no date, language, or publication restrictions.

Selection criteria: All randomised controlled trials that involved an intervention described as RMT versus a control group using an alternative intervention, placebo, usual care, or no intervention for people with cervical SCI were considered for inclusion.

Data collection and analysis: Two review authors independently selected articles for inclusion, evaluated the methodological quality of the studies, and extracted data. We sought additional information from the trial authors when necessary. We presented results using mean differences (MD) (using post-test scores) and 95% confidence intervals (CI) for outcomes measured using the same scale or standardised mean differences (SMD) and 95% CI for outcomes measured using different scales.

Main results: We included 11 studies with 212 participants with cervical SCI. The meta-analysis revealed a statistically significant effect of RMT for three outcomes: vital capacity (MD mean end point 0.4 L, 95% CI 0.12 to 0.69), maximal inspiratory pressure (MD mean end point 10.50 cm/H2O, 95% CI 3.42 to 17.57), and maximal expiratory pressure (MD mean end point 10.31 cm/H2O, 95% CI 2.80 to 17.82). There was no effect on forced expiratory volume in one second or dyspnoea. We could not combine the results from quality of life assessment tools from three studies for meta-analysis. Respiratory complication outcomes were infrequently reported and thus we could not include them in the meta-analysis. Instead, we described the results narratively. We identified no adverse effects as a result of RMT in cervical SCI.

Authors' conclusions: In spite of the relatively small number of studies included in this review, meta-analysis of the pooled data indicates that RMT is effective for increasing respiratory muscle strength and perhaps also lung volumes for people with cervical SCI. Further research is needed on functional outcomes following RMT, such as dyspnoea, cough efficacy, respiratory complications, hospital admissions, and quality of life. In addition, longer-term studies are needed to ascertain optimal dosage and determine any carryover effects of RMT on respiratory function, quality of life, respiratory morbidity, and mortality.

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Conflict of interest statement

The review authors are currently involved in a research study, which, on completion, may be eligible for inclusion in this review.

Figures

1
1
Flow diagram.
2
2
Risk of bias graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.
3
3
Risk of bias summary: review authors' judgements about each risk of bias item for each included study.
1.1
1.1. Analysis
Comparison 1 Respiratory muscle training versus control, Outcome 1 Dyspnoea.
1.2
1.2. Analysis
Comparison 1 Respiratory muscle training versus control, Outcome 2 Vital capacity (L).
1.3
1.3. Analysis
Comparison 1 Respiratory muscle training versus control, Outcome 3 Maximal inspiratory pressure (cmH2O).
1.4
1.4. Analysis
Comparison 1 Respiratory muscle training versus control, Outcome 4 Maximal expiratory pressure (cmH2O).
1.5
1.5. Analysis
Comparison 1 Respiratory muscle training versus control, Outcome 5 Forced expiratory volume in 1 second (L).
See this image and copyright information in PMC

Update of

  • doi: 10.1002/14651858.CD008507

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