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EditorialEditorials

Daytime Mouthpiece Ventilation Plus Nighttime Noninvasive Ventilation Improves Quality of Life in Patients With Neuromuscular Disease

David C Czell
Respiratory Care September 2014, 59 (9) 1460-1461; DOI: https://doi.org/10.4187/respcare.03418
David C Czell
Department of Neurology Cantonal Hospital Winterthur Winterthur, Switzerland
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Respiratory failure due to respiratory muscle dysfunction is a common problem in neuromuscular diseases,1 and respiratory muscle weakness can be reversible, relapsing, or progressive.2 In amyotrophic lateral sclerosis (ALS), the respiratory muscle dysfunction is not reversible, and respiratory failure is fatal, usually within 5 years.3 One method of measuring the decline of respiratory function in patients with ALS is the sniff nasal inspiratory pressure test, which is independent of facial muscle strength and correlates with invasive tests of diaphragm strength and sternocleidomastoid function.4,5 The most commonly used measurement, including in clinical trials, is FVC. There is a linear relationship between FVC and ALS functional rating scale score,6 but measuring FVC can be difficult for ALS patients with bulbar dysfunction because the FVC test requires that the patient tightly seal his or her lips around the mouthpiece.

In patients with ALS, noninvasive ventilation should be initiated early.3 Progression of the disease leads first to rapid eye movement-related and later also to non-rapid eye movement-related sleep-disordered breathing. The sleep-disordered breathing in patients with ALS or other neuromuscular diseases may be obstructive sleep apnea syndrome. Most patients suffer from alveolar hypoventilation. The resulting nocturnal hypercapnia leads to disturbed sleep architecture, with consecutive nights of decreased sleep quality and efficiency.7 In those who do not yet have bulbar dysfunction, noninvasive ventilation extends life, and in those with bulbar dysfunction and spinal onset, noninvasive ventilation improves the quality of life.8,9 Noninvasive ventilation improves daytime hypoventilation in patients with neuromuscular diseases, probably by improving nocturnal hypercapnia and thus restoring central chemoreceptor sensitivity.10,11 In this issue of Respiratory Care, Khirani et al12 report their study of ventilators for mouthpiece ventilation in patients with neuromuscular disease. For 30 subjects (mean age 33 ± 11 y) with various neuromuscular diseases, the authors used a questionnaire to assess the practice and effects of mouthpiece ventilation. The subjects reported improvements in dyspnea, fatigue, speech, and eating. The improvement of speech and eating may be a side effect because of the improvement of dyspnea and fatigue. Mouthpiece ventilation in patients with chronic respiratory failure is often used.13,14 Mouthpieces are very useful in adjunct daytime ventilation for patients suffering from neuromuscular diseases who do not have the ability to maintain acceptable diurnal arterial blood gases without frequent intermittent periods of assistance.15 During the night while sleeping, most patients use a mask because a mouthpiece is uncomfortable. Most patients who need assistance day and night use a combination of interfaces.15 One advantage of the mouthpiece is that it can be mounted close to the head so that the patient can speak after each breath. A second advantage is prevention of air leakage through the mouth, which can occur when using nasal masks. If nasal leakage occurs, nose plugs can be used.13,14,16 Disadvantages are the occurrence of orthodontic problems and hypersalivation, which can be very uncomfortable for patients with ALS because hypersalivation occurs often in patients with bulbar symptoms.15 Further studies on mouthpiece ventilation in patients with progressive respiratory impairment are needed in the quest to improve the quality of life in patients with neuromuscular disease.

Footnotes

  • Correspondence: David C Czell MD, Department of Neurology, Cantonal Hospital Winterthur, Brauerstrasse 15, 8401 Winterthur, Switzerland. E-mail: david.czell{at}gmx.ch.
  • Dr Czell has disclosed no conflicts of interest.

  • See the Original Study on Page 1329

  • Copyright © 2014 by Daedalus Enterprises

References

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Respiratory Care: 59 (9)
Respiratory Care
Vol. 59, Issue 9
1 Sep 2014
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Daytime Mouthpiece Ventilation Plus Nighttime Noninvasive Ventilation Improves Quality of Life in Patients With Neuromuscular Disease
David C Czell
Respiratory Care Sep 2014, 59 (9) 1460-1461; DOI: 10.4187/respcare.03418

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Daytime Mouthpiece Ventilation Plus Nighttime Noninvasive Ventilation Improves Quality of Life in Patients With Neuromuscular Disease
David C Czell
Respiratory Care Sep 2014, 59 (9) 1460-1461; DOI: 10.4187/respcare.03418
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