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<article class="to_single to_single-article">
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<h1 class="to_single-page-title">
Sleep Disorders in Neuromuscular Diseases </h1>
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Authors:
<a href="https://www.touchrespiratory.com/authors/eric-j-gartman/">Eric J Gartman</a>
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<i>US Respiratory & Pulmonary Diseases</i>. 2018;3(1):27–32 DOI: <a href="https://doi.org/10.17925/USRPD.2018.13.1.27">https://doi.org/10.17925/USRPD.2018.3.1.27</a> <div class="mobile-post-share">
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<div class="to_single-article-intro">
<h2>Abstract</h2>
<p>
Disturbances in sleep are common in patients with neuromuscular diseases (NMDs) and are the source of a significant amount of morbidity.
Underlying these disorders of sleep are the physiologic alterations that result from progressive changes in muscle strength, effective
ventilation, and control of respiration. This review will discuss the normal changes that occur during sleep, how the physiologic alterations
present in neuromuscular and chest wall disorders affect these normal processes, how to assess patients for the presence of sleep disorders,
and how to approach treatment. </p>
<h2>Keywords</h2>
<p>
Sleep disorders; neuromuscular diseases; respiratory physiology; treatment </p>
<h2>Disclosure</h2>
<p>
Eric J Gartman has nothing to disclose
in relation to this article. The views expressed are
those of the author and do not necessarily reflect
the position or policy of the Department of Veterans
Affairs or the United States government. </p>
<h2>Review Process</h2>
<p>
Double-blind peer review.
<b>Compliance with Ethics : </b>This article involves a review
of the literature and did not involve any studies with
human or animal subjects performed by the author. </p>
<h2>Authorship</h2>
<p>
The named author meets the International
Committee of Medical Journal Editors (ICMJE) criteria
for authorship of this manuscript, takes responsibility
for the integrity of the work as a whole, and has given
final approval for the version to be published. </p>
<h2>Open Access</h2>
<p>
This article is published under the Creative
Commons Attribution Non-commercial License, which
permits any non-commercial use, distribution, adaptation,
and reproduction provided the original author and source
are given appropriate credit. © The Author 2018. </p>
<h2>Received</h2>
<p>
July 17, 2018 </p>
<h2>Accepted</h2>
<p>
2018-09-02T00:00:00 </p>
<h2>Published Online</h2>
<p>
September 18, 2018 </p>
<h2>Correspondence</h2>
<p>
Eric J Gartman, The Warren Alpert School of Medicine of Brown University Division of Pulmonary, Critical Care, and Sleep Medicine, Providence VA Medical Center, Providence, RI 02908 US. E: eric_gartman@brown.edu </p>
<h2>Support</h2>
<p>
No funding was received in the publication of this article. </p>
</div>
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<p class="_-1-Body-text-heading-1">Highlights</p>
<ul>
<li class="_-Body-BULLETS ParaOverride-1">Neuromuscular diseases exhibit a complex array of respiratory physiologic changes that typically progress over time.</li>
<li class="_-Body-BULLETS ParaOverride-1">These physiologic changes can promote significant respiratory abnormalities during sleep, leading to decreased quality of life, significant daytime symptoms, and overall worse survival.</li>
<li class="_-Body-BULLETS ParaOverride-1">There should be a high index of suspicion for the emergence of sleep-related disorders, especially since ventilatory issues during sleep can precede awake ones.</li>
<li class="_-Body-BULLETS ParaOverride-1">Patients should undergo a thorough clinical and laboratory evaluation and early referral for sleep evaluation with overnight polysomnography should be considered.</li>
<li class="_-Body-BULLETS ParaOverride-1">Non-invasive ventilation is the mainstay treatment for sleep-disordered breathing and hypoventilation in these patients and has been shown to promote a wide range of positive outcomes.</li>
</ul>
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</table>
<p class="_-Body-Text">Disturbances in sleep are common in patients with neuromuscular diseases (NMDs) and are the source of a significant amount of morbidity.<span class="Superior">1–4</span> Underlying these disorders of sleep are the physiologic alterations that result from progressive changes in muscle strength, effective ventilation, and control of respiration. This review will discuss the normal changes that occur during sleep, how the physiologic alterations present in neuromuscular and chest wall disorders affect these normal processes, how to assess patients for the presence of sleep disorders, and how to approach treatment.</p>
<p class="_-1-Body-text-heading-1">Normal physiology during sleep</p>
<p class="_-Body-Text">The sleep state demonstrates predictable effects on the respiratory system and control of ventilation, which generally have little physiologic consequence. Normal sleep progresses and cycles through three phases of non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep – with most adults spending approximately 25% of sleep in REM.<span class="Superior">5</span> The patterns of breathing, ventilation, and muscle tone vary between REM and NREM sleep. At the initiation of sleep (NREM), ventilation declines due to a regular and more shallow breathing pattern.<span class="Superior">6</span> There is a reduction in upper airway muscle tone and a resultant increase in airway resistance.<span class="Superior">7</span> These, in combination with a reduced chemosensitivity and wakefulness drive to breathe, lead to a mild predictable rise in the partial pressure of carbon dioxide (p<a id="_idTextAnchor000"></a>CO<span class="Subscript">2</span>).<span class="Superior">8–11</span></p>
<img src="http://www.stmra.org/images/obgrabber/2019-08/d28c017eba.png" />
<img src="http://www.stmra.org/images/obgrabber/2019-08/99d76174f1.png" />
<p class="_-Body-Text">With progression into REM sleep, the pattern of breathing becomes irregular with variations in respiratory rate and tidal volume.<span class="Superior">12,13</span> Chemosensitivity to low partial pressures of oxygen (pO<span class="Subscript">2</span>) and elevations in pCO<span class="Subscript">2</span> declines further.<span class="Superior">10,14,15</span> Skeletal muscle tone is significantly reduced, with the exception of the eye and diaphragm muscles—and thus contributions from other muscles of respiration are minimal.<span class="Superior">16–18</span> Due to this muscle atonia, upper airway resistance rises further in REM sleep.<span class="Superior">19–21</span></p>
<p class="_-Body-Text">In general, lung volumes (specifically functional residual capacity) are reduced in the supine position and during sleep and can be accentuated during periods of muscle atonia.<span class="Superior">22–24</span></p>
<p class="_-1-Body-text-heading-1">Effects of sleep in neuromuscular disease</p>
<p class="_-Body-Text">Patients with neuromuscular and restrictive chest wall diseases can commonly be affected by sleep disorders resulting from a combination of airway muscle weakness, chest wall/rib cage stiffness, and diaphragmatic and respiratory muscle weakness.<span class="Superior">25</span> The pattern of respiratory system involvement in a given condition determines the risk for a given type of sleep-disordered breathing.<span class="Superior">26</span> Further, unfortunately, many of these disorders have marked progression over time and their effects on sleep become more pronounced. A summary of the common physiologic changes discussed below is displayed in <span class="Italics">Tab</span><span class="Italics">le 1</span>.</p>
<p class="_-2-Body-Text-Heading-2">Hypoventilation during sleep</p>
<p class="_-Body-Text">As patients with NMD progress, issues with hypoventilation ensue. Importantly, given the sleep physiology discussed above, hypoventilation during sleep will precede awake hypoventilation (so one should not wait for evidence of daytime hypoventilation to consider evaluating a given patient’s sleep). Initially, given the normal muscle atonia during REM and the burden of ventilation solely placed on the diaphragm muscles, sleep hypoventilation first presents during this sleep stage (<span class="Italics">Figure 1</span>).<span class="Superior">1,27–29</span> This effect can be amplified in children with NMDs, since they spend a longer time in REM sleep.<span class="Superior">30</span> With worsening of muscle weakness over time, hypoventilation eventually occurs during NREM sleep as well.<span class="Superior">1,31</span></p>
<p class="_-2-Body-Text-Heading-2">Respiratory muscle weakness</p>
<p class="_-Body-Text">The underlying driver of hypoventilation during sleep is weakness of the respiratory muscles, most importantly, the diaphragm muscles. Further, when diaphragm weakness and/or paralysis is present, the effect of body position during sleep can be substantial—as has been shown in disorders of isolated unilateral and bilateral paralysis where the vital capacity can decline 15–40%, respectively, by assuming a supine posture.<span class="Superior">32–34</span></p>
<p class="_-Body-Text">Diaphragm weakness or paralysis is a common feature of many NMDs. In patients with amyotrophic lateral sclerosis (ALS), phrenic nerve involvement and associated diaphragm weakness has been shown to lead to hypoventilation and nocturnal hypercapnia.<span class="Superior">28,35–37</span> In patients with Duchenne muscular dystrophy, hypoventilation during sleep has been demonstrated and is likely related to the degree of diaphragm involvement; although, predicting sleep hypoventilation based on pulmonary function values has been shown to be somewhat unreliable, except possibly in patients with significantly reduced expiratory flows.<span class="Superior">38–41</span> Diaphragmatic insufficiency is common in acid maltase deficiency (Pompe’s disease) and significant hypoventilation and oxygenation deficiencies have been demonstrated, especially during REM sleep.<span class="Superior">31,42</span></p>
<p class="_-2-Body-Text-Heading-2">Chest wall disorders</p>
<p class="_-Body-Text">Ventilatory abnormalities during sleep can arise in patients with abnormal chest walls, such as patients with congenital deformities and acquired musculoskeletal disorders. Alterations in the thoracic cage can lead to deleterious effects on chest wall mechanics and respiratory efficiency, as well as reductions in overall lung volume. Taken together, these issues predispose such patients to impaired inspiratory muscle function and subsequent sleep hypoventilation and hypoxemia.<span class="Superior">43,44</span></p>
<p class="_-1-Body-text-heading-1">Upper airway musculature/resistance</p>
<p class="_-Body-Text">Resistance in the upper airway normally increases during sleep,<span class="Superior">31,45</span> and certain anatomic factors may make one susceptible to the development of sleep apnea (and these factors obviously remain important in patients with NMD).<span class="Superior">20</span> In patients with NMD, the progressive physiologic changes that occur in some disorders further predispose them to significant issues with sleep-disordered breathing/sleep apnea. Given the concurrent inspiratory (diaphragmatic) weakness that can be present, it can be difficult to decipher obstructive apneic/hypopneic events from hypoventilatory/diaphragmatic events.<span class="Superior">46</span></p>
<p class="_-Body-Text">In patients with NMDs affecting the bulbar muscles, it has been demonstrated that they can have abnormalities suggesting upper airway collapse and flow truncation and oscillation during pulmonary function testing and on flow-volume loops; additionally, it was shown that those with the most abnormal testing went on to develop frank respiratory failure in the future.<span class="Superior">47–49</span> The magnitude of effect on sleep-disordered breathing in patients with significant bulbar involvement is unclear, but it intuitively follows that patients with this pattern of weakness may have more profound airway issues during sleep. For example, obstructive events were found to be more prevalent in ALS patients with bulbar involvement than without.<span class="Superior">50</span> However, other studies have suggested that sleep disruption and blood gas abnormalities may be more attributable to weakness and hypoventilation, as opposed to true obstructive sleep events.<span class="Superior">28,51</span> Similarly, in studies in patients with post-polio syndrome, bulbar involvement was shown to either lead to mostly central sleep events or to not increase the frequency of sleep-disordered breathing compared to those without bulbar involvement.<span class="Superior">52,53</span></p>
<p class="_-Body-Text">Several types of NMDs have been reported to exhibit a potential bimodal pattern of appearance over time, meaning that one sleep-disordered breathing pattern predominates in the earlier stages of the disease (or at younger ages) and then another is evident in the latter part. Patients with Pompe’s disease (acid maltase deficiency) have been shown to have obstructive events due to body habitus early in their course, followed by a predominance of hypoventilation and pseudo-central events later.<span class="Superior">31,42,45</span> In a similar fashion, patients with Duchenne muscular dystrophy have demonstrated primarily obstructive sleep apnea events early in life, followed by the development of sleep hypoventilation.<span class="Superior">39,54,55</span> Notably, these studies showed that a combination of both obstructive events and hypoventilation can be present to some degree, especially in the transition period between early and latter stages of disease. Further, as mentioned above, misclassification of events as obstructive versus pseudo-central or hypoventilatory in a given study may lead to erroneous conclusions.<span class="Superior">56</span></p>
<p class="_-Body-Text">Sleep-disordered breathing patterns in patients with spinal cord injury can vary by the level of injury and can be a combination of obstructive and central/hypoventilation events. In patients with cervical spine injuries, sleep apnea can be a common finding, with additional hypoventilatory issues being present the more the diaphragm is involved.<span class="Superior">57,58</span> It has been suggested that spinal cord injury patients are at increased risk of obstructive sleep apnea due to an increase in collapsibility of the upper airway.<span class="Superior">59–61</span> Further, patients with spinal cord injury can develop an increase in neck circumference, which predisposes them further to sleep-disordered breathing (in this case, mainly obstructive events).<span class="Superior">57,62</span></p>
<p class="_-Body-Text">Finally, there have been several reports of a potential increased risk of obstructive sleep apnea events in Charcot-Marie-Tooth disease. One report of this association was from a family with the condition, and it was postulated that the mechanism of sleep-disordered breathing was pharyngeal neuropathy.<span class="Superior">63</span> An additional study reported a relatively high rate of sleep apnea in these patients compared with controls.<span class="Superior">64</span></p>
<p class="_-2-Body-Text-Heading-2">Central involvement</p>
<p class="_-Body-Text">In addition to sleep disturbances resulting from respiratory muscle weakness, physiologic changes in the chest wall, and upper airway resistance changes, patients with NMDs can have sleep abnormalities associated with central events and control of breathing. Prominent and progressive hypoventilation in many of these disorders leads to blunted responses to hypercapnia and hypoxemia, which in turn, may lead to compensatory mechanisms (e.g. retention of bicarbonate by the kidney) that may further decrease responsiveness to abnormal blood gases and progressively worsen overall ventilation.<span class="Superior">65,66</span></p>
<p class="_-Body-Text">Several unique centrally-mediated sleep disorders have been recognized in various conditions. Due to progressive muscle compromise, patients with muscular dystrophies and comorbid cardiomyopathies have demonstrated Cheyne-Stokes breathing with sleep.<span class="Superior">67</span> Periodic breathing and prominent central sleep apnea has also been recognized in patients with cervical spinal cord injury and myotonic dystrophy—and while this can appear similar to Cheyne-Stokes pattern, the underlying mechanism is not the same and is proposed to be due to instability in the control of breathing.<span class="Superior">68–70</span> Further, patients with more advanced myotonic dystrophy have been recognized to have significant daytime hypersomnia out-of-proportion to their sleep-disordered breathing and REM at onset of sleep.<span class="Superior">71,72</span> These can be characteristics associated with patients with narcolepsy and loss of hypocretin neurons, and it has been demonstrated that these patients can have low hypocretin-1 levels when their cerebrospinal fluid is sampled.<span class="Superior">72</span></p>
<p class="_-2-Body-Text-Heading-2">Restless leg syndrome</p>
<p class="_-Body-Text">While most attention is directed against breathing and ventilatory sleep disorders in NMD patients, it is important to recognize that other pathologies may disturb sleep. Restless leg syndrome (RLS) is generally defined as presenting with the following features: (1) an urge to move the limbs that is usually associated with paresthesia or dysethesia; (2) symptoms that start or worsen with rest; (3) some relief of symptoms with physical activity; (4) symptoms worst at night; (5) can often be associated with periodic leg movements in sleep.<span class="Superior">73</span> A wide array of conditions have been found to be associated with the presence of RLS including Parkinsonism, peripheral neuropathies, spinal cord injury, cognitive dysfunction, hyposmia, and cardiometabolic diseases.<span class="Superior">74</span> In chronic neuropathic conditions, several populations of patients have been found to have a high prevalence of comorbid RLS. In patients with post-poliomyelitis, the rate of RLS is high, with the larger-cohort studies estimating prevalence ranging from 36–40.4%.<span class="Superior">75,76</span> Similarly, patients with Charcot-Marie-Tooth type 2 disease have been found to have equally high rates of RLS.<span class="Superior">77</span> As such, screening for the typical symptoms of RLS should be performed in these patients.</p>
<p class="_-1-Body-text-heading-1">Evaluation of sleep disorders in neuromuscular disease</p>
<p class="_-2-Body-Text-Heading-2">Symptoms</p>
<p class="_-Body-Text">Many of the symptoms associated with sleep disorders in patients with NMD are similar to other patients, and others are unique. Patients will often present with daytime symptoms of morning headaches, daytime sleepiness, generalized fatigue, dyspnea bending over (or otherwise compromising diaphragm function by changing chest wall compliance), and excessive sleep time; while at night they may report frequent awakenings, orthopnea, snoring, nocturia, and potentially witnessed apneas.<span class="Superior">78–81</span></p>
<p class="_-2-Body-Text-Heading-2">Laboratory and clinical evaluation</p>
<p class="_-Body-Text">All patients with neuromuscular and chest wall disorders should have a thorough neurologic examination and evaluation of vital signs, including pulse oximetry. Laboratory evaluation can be helpful for assessment of hypoventilation (high serum bicarbonate, high pCO<span class="Subscript">2</span>); although, with recognition that nocturnal hypoventilation and hypercapnia can be present in the absence of daytime hypercapnia.<span class="Superior">82</span> Full pulmonary function testing, including any available advanced testing of respiratory muscle strength, should be obtained and serially assessed (especially if clinical symptoms are present and progressive).<span class="Superior">83</span> While the predictive ability of pulmonary function parameters for sleep-disordered breathing is not perfectly reliable, several useful suggestions have been described and are generally seen as an evident sign of significantly impaired respiratory muscle strength which could predispose to nocturnal hypoventilation and other forms of sleep-disordered breathing (forced expiratory volume in 1 second [FEV1] ≤ 40% predicted, forced vital capacity [FVC] <1–1.5 L, reduction in seated to supine vital capacity >25%, significant reductions in maximal inspiratory [MIP] or sniff nasal pressures [SNIP]).<span class="Superior">33,40,84–88</span></p>
<img src="http://www.stmra.org/images/obgrabber/2019-08/52abfae452.png" />
<p class="_-Body-Text">Tests of respiratory muscle strength can be particularly useful in assessing patients at risk for hypoventilation. It has been recognized that significant reductions in maximal static inspiratory and expiratory pressures (MIP, MEP) can exist without obvious correlations to the degree of generalized muscle weakness.<span class="Superior">89</span> Further, a proximal distribution of muscle weakness in myopathic patients has been shown to portend a greater risk of respiratory muscle weakness, and reduced MIP/MEPs were associated with worse pulmonary function, CO<span class="Subscript">2</span> retention, and higher rates of respiratory infections and failure.<span class="Superior">89,90</span> The ratio of MIP and MEP can also be useful—especially in conditions affecting the diaphragm—where a reduction in MIP and relative preservation of MEP would be expected. The ratio of MIP:MEP can potentially be used as an alternative to supine testing when such positioning cannot be tolerated.<span class="Superior">91</span></p>
<p class="_-Body-Text">Given the nature of the maneuvers, maximal static mouth pressures can be difficult to perform and/or unreliable, especially as patients develop severe weakness (air leak, submaximal efforts). An alternative assessment of inspiratory muscle strength is maximal SNIP. The sniff maneuver comes naturally to most people and can be a better quantitative and reproducible test than MIP. In several studies using esophageal balloons, it was found that maximal sniffs generally produced higher pressures and were less variable than MIPs, were representative of esophageal pressure, and accurately reflected inspiratory muscle strength.<span class="Superior">22,92–95</span> In patients with ALS, the SNIP test is sensitive for the detection of weakness early in the disease, declines with disease progression, and remains feasible to do in patients with advanced disease who cannot perform other maneuvers.<span class="Superior">96</span></p>
<p class="_-2-Body-Text-Heading-2">Nocturnal/sleep assessment</p>
<p class="_-Body-Text">While limited modalities such as nocturnal pulse oximetry and home sleep testing can be valuable in suggesting the presence of sleep hypoventilation or more severe sleep-disordered breathing, its value can be limited in the full evaluation of a patient with a neuromuscular or chest wall disorder.<span class="Superior">97,98</span> Given its increased ability to properly classify event types, determine sleep stage, determine arousal etiologies, assess for limb movements, and be used for treatment titrations, full overnight polysomnography is considered the gold standard when evaluating patients with neuromuscular and chest wall disorders.<span class="Superior">5,98–100</span> Furthermore, there should be strong consideration of performing non-invasive CO<span class="Subscript">2</span> monitoring during overnight polysomnography given the additional information it can provide, especially when assessing for nocturnal hypoventilation (i.e., demonstration of prolonged or cumulative elevations in CO<span class="Subscript">2</span>). There are two main options for non-invasive CO<span class="Subscript">2</span> monitoring: end-tidal CO<span class="Subscript">2</span> breath analysis and transcutaneous CO<span class="Subscript">2</span> analysis. Given potential issues with the validity of end-tidal CO<span class="Subscript">2</span> monitoring in patients with comorbid heterogenous ventilation and/or increased physiologic deadspace, transcutaneous CO<span class="Subscript">2</span> monitoring generally is preferred.<span class="Superior">101–104</span></p>
<p class="_-Body-Text">A summary of the above clinical assessment is displayed in <span class="Italics">Tables 2</span> and <span class="Italics">3</span>.</p>
<img src="http://www.stmra.org/images/obgrabber/2019-08/59ac06e4fd.png" />
<p class="_-1-Body-text-heading-1">Treatment</p>
<p class="_-Body-Text">While continuous positive airway pressure is most often used in the general population for sleep apnea, it generally is not indicated for use in NMD-related sleep disorders due to the predominance of central events and hypoventilation. Furthermore, although significant nocturnal hypoxemia may be present, in these disorders it is secondary to hypoventilation and simple oxygen supplementation is not used as a standalone therapy.<span class="Superior">84,105</span> In fact, institution of oxygen therapy alone could be deleterious.<span class="Superior">106</span> As such, non-invasive positive pressure ventilation (NPPV) is the treatment of choice in these patients.<span class="Superior">107</span> Several studies have demonstrated that NPPV improves survival in various NMDs, improves blood gas abnormalities, and improves quality of life and symptoms.<span class="Superior">108–116</span></p>
<p class="_-Body-Text">More recently, several new modes have been developed that theoretically improve upon standard NPPV. Average volume-assured pressure support (AVAPS) and intelligent volume-assured pressure support (iVAPS) are proprietary modes that aim to maintain an overall target ventilation, namely tidal volume (AVAPS) or alveolar ventilation (iVAPS). In turn, the intended goal is to maintain a stable level of ventilation, and thus pCO<span class="Subscript">2</span>. These modes are likely well-suited to patients with neuromuscular and chest wall disorders whose respiratory efforts may vary significantly over time between sleep stages, changes in body position, and/or while awake. For example, since many patients have more prominent hypoventilation in REM, fixed pressure NPPV may provide too much pressure in some sleep stages and too little in others.<span class="Superior">117</span> Several small studies have been performed assessing for improvements in patient comfort, adherence, and improvements in physiologic variables, which generally have supported their use in hypoventilatory conditions.<span class="Superior">118–122</span> However, it should be noted that no large studies have demonstrated superiority of these new modes over standard NPPV—especially in terms of objective outcomes such as functionality or survival—and further research is needed to buttress their theoretical benefit.</p>
<p class="_-2-Body-Text-Heading-2">Indications for initiating treatment</p>
<p class="_-Body-Text">There is some concern that current guidelines for the initiation of non-invasive ventilation in NMD patients may lead to a late initiation of treatment and further refining of guidelines may be needed to recommend the optimal period to maximize benefit.<span class="Superior">123</span> This may be especially true in certain disease processes (e.g. ALS) where the early initiation of non-invasive ventilation may lead to improvement in lung function and quality of life.<span class="Superior">124,125</span></p>
<p class="_-Body-Text">Published consensus guidelines suggest initiating non-invasive ventilation when: (1) vital capacity <50% predicted; (2) MIP <60 cm H<span class="Subscript">2</span>O; (3) nocturnal hypoxemia <88% for >5 minutes; or (4) daytime blood gas showing pCO<span class="Subscript">2</span> >45 mmHg.<span class="Superior">126</span> More recently proposed guidelines expand these criteria to include symptoms related to muscle weakness (dyspnea, tachypnea, orthopnea, sleep arousals, morning headaches, daytime fatigue/sleepiness), clinical signs (use of accessory respiratory muscles, paradoxical respiration), and abnormal pulmonary function tests (forced vital capacity <80% predicted, SNIP <40 cm H<span class="Subscript">2</span>O, nocturnal desaturation, morning blood gas pCO<span class="Subscript">2</span> >45 mmHg).<span class="Superior">86</span> As stated previously, the onset of nocturnal hypoventilation may significantly pre-date the emergence of the parameters above and it is likely that further modification of these criteria may include sleep-related data.</p>
<p class="_-2-Body-Text-Heading-2">Diaphragmatic pacing</p>
<p class="_-Body-Text">In patients with an intact peripheral neuromuscular anatomy related to the major inspiratory muscles/diaphragm (high cervical spinal cord injury, central ventilation disorders), it may be possible to provide significant inspiratory support by stimulating the diaphragm to contract—lessening, or even obviating, the need for assisted ventilation. This can be achieved by electrically stimulating the phrenic nerve or the diaphragm itself. In properly selected patients, these devices enable many individuals to reliably remain off assisted ventilation during the day, and many full-time for extended periods of time.<span class="Superior">127–129</span> It is important to note that patient selection is extremely important, as there is a suggestion of potential harm in certain populations (e.g. ALS).<span class="Superior">130,131</span></p>
<p class="_-1-Body-text-heading-1">Conclusion</p>
<p class="_-Body-Text">NMDs and chest wall disorders exhibit a complex array of respiratory physiologic changes that typically progress over time. As this occurs, reduced lung volumes and hypoventilation, due to respiratory muscle weakness, can promote significant abnormalities during sleep, leading to decreased quality of life, significant daytime symptoms, and overall worse survival. Practitioners caring for these patients should have a high index of suspicion for the emergence of sleep-related disorders, especially since ventilatory issues during sleep can precede awake ones. Patients should undergo a thorough clinical and laboratory work-up and be referred early for sleep evaluation with overnight polysomnography. NPPV is the standard treatment for sleep-disordered breathing in these patients and has been shown to promote a wide range of positive outcomes.</p>
</div>
</article>
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Sleep Disorders in Neuromuscular Diseases
Highlights
|
Highlights
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Waterpipe tobacco smoking (WTS) is increasingly popular among young people. Although perceived to be safer than cigarettes as smoke is filtered through water, narghile smoke is rich in carbon
Underdiagnosis of asthma is an important issue for public health and also at individual level for asthma patients. The 2017 Global Initiative for Asthma used epidemiological surveys to compare the prevalence
With each passing month, the volume of medical data and information seems to grow exponentially. Even with the most finely tuned and calibrated Twitter feeds, relevant journal feeds, emails and bookmarked
My experience in the care of ventilator-dependent children involves over 20 years’ experience in both the home and long-term care environments. I have managed over 50 ventilator-dependent children in a university-based