scholarly journals Tongue muscle plasticity following hypoglossal nerve stimulation in aged rats

2012 ◽  
Vol 47 (2) ◽  
pp. 230-240 ◽  
Author(s):  
Nadine P. Connor ◽  
John A. Russell ◽  
Michelle A. Jackson ◽  
Heidi Kletzien ◽  
Hao Wang ◽  
...  
Keyword(s):  
Nerve Stimulation ◽  
Hypoglossal Nerve ◽  
Aged Rats ◽  
Hypoglossal Nerve Stimulation ◽  
Tongue Muscle ◽  
Muscle Plasticity

scholarly journals Influence of tongue muscle contraction and dynamic airway pressure on velopharyngeal volume in the rat

2008 ◽  
Vol 104 (3) ◽  
pp. 682-693 ◽  
Author(s):  
Ralph F. Fregosi
Keyword(s):  
Muscle Contraction ◽  
Soft Palate ◽  
Nerve Stimulation ◽  
Hypoglossal Nerve ◽  
Transmural Pressure ◽  
Positive Pressure ◽  
Medial Branch ◽  
Hypoglossal Nerve Stimulation ◽  
Tongue Muscle ◽  
Pharyngeal Airway

The mammalian pharynx is a collapsible tube that narrows during inspiration as transmural pressure becomes negative. The velopharynx (VP), which lies posterior to the soft palate, is considered to be one of the most collapsible pharyngeal regions. I tested the hypothesis that negative transmural pressure would narrow the VP, and that electrical stimulation of extrinsic tongue muscles would reverse this effect. Pressure (−6, −3, 3, and 6 cmH2O) was applied to the isolated pharyngeal airway of anesthetized rats that were positioned in a 4.7-T MRI scanner. The volume of eight axial slices encompassing the length of the VP was computed at each level of pressure, with and without bilateral hypoglossal nerve stimulation (0.1-ms pulse, one-third maximum force, 80 Hz). Negative pressure narrowed the VP, and either whole hypoglossal nerve stimulation (coactivation of protrudor and retractor muscles) or medial nerve branch stimulation (independent activation of tongue protrudor muscles) reversed this effect, with the greatest impact in the caudal one-third of the VP. The dilating effects of medial branch stimulation were slightly larger than whole nerve stimulation. Positive pressure dilated the VP, but tongue muscle contraction did not cause further dilation under these conditions. I conclude that the narrowest and most collapsible segment of the rat pharynx is in the caudal VP, posterior to the tip of the soft palate. Either coactivation of protrudor and retractor muscles or independent contraction of protrudor muscles caused dilation of this region, but the latter was slightly more effective.

Contralateral Tongue Muscle Activation during Hypoglossal Nerve Stimulation

2020 ◽  
Vol 162 (6) ◽  
pp. 985-992 ◽  
Author(s):  
Joshua J. Sturm ◽  
Oleg Modik ◽  
Ioannis Koutsourelakis ◽  
Maria V. Suurna
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Nerve Stimulation ◽  
Muscle Activation ◽  
Hypoglossal Nerve ◽  
Oxygen Desaturation ◽  
Apnea Hypopnea Index ◽  
Hypoglossal Nerve Stimulation ◽  
Tongue Muscle ◽  
Obstructive Sleep

Objective The effectiveness of upper airway stimulation via hypoglossal nerve stimulation for obstructive sleep apnea depends upon the pattern of tongue muscle activation produced. This study investigated the nature of contralateral tongue muscle activation by unilateral hypoglossal nerve stimulation using intraoperative nerve integrity monitoring in conjunction with electromyography and explored the relationship between contralateral tongue muscle activation and polysomnographic measures of obstructive sleep apnea severity. Study Design Prospective case series. Setting Tertiary care medical center. Subjects and Methods Fifty-one patients underwent unilateral (right) hypoglossal nerve stimulator implantation for obstructive sleep apnea. Neurophysiological data included electromyographic responses in ipsilateral (right) and contralateral (left) genioglossus muscles in response to intraoperative bipolar probe stimulation (0.3 mA) of medial hypoglossal nerve branches. Clinical data included pre- and postoperative apnea-hypopnea indices and oxygen desaturation levels. Results A subset of patients (20/51, 39%) exhibited electromyographic responses in both the ipsilateral and contralateral genioglossus (bilateral), whereas the remaining patients (31/51, 61%) exhibited electromyographic responses only in the ipsilateral genioglossus (unilateral). The baseline characteristics of bilateral and unilateral responders were similar. Both groups exhibited significant and comparable improvements in apnea-hypopnea index and oxygen desaturations after hypoglossal nerve stimulation. Neither the amplitude nor the latency of contralateral genioglossus responses was predictive of clinical outcomes. Conclusion A subset of patients undergoing unilateral hypoglossal nerve stimulation exhibits activation of contralateral genioglossus muscles. Patients with unilateral and bilateral genioglossus responses exhibit comparable, robust improvements in apnea-hypopnea index and oxygen desaturation levels.

Tongue-Based Procedures in Treating Refractory Obstructive Sleep Apnea in Down Syndrome Patients: A Systematic Review and Meta-Analysis

FACE ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 65-70
Author(s):  
Paul B. Lee ◽  
Michael T. Chung ◽  
Jared Johnson ◽  
Jordyn Lucas ◽  
Caitlin R. Priest ◽  
...  
Keyword(s):  
Systematic Review ◽  
Obstructive Sleep Apnea ◽  
Down Syndrome ◽  
Sleep Apnea ◽  
Nerve Stimulation ◽  
Hypoglossal Nerve ◽  
Meta Analysis ◽  
Apnea Hypopnea Index ◽  
Hypoglossal Nerve Stimulation ◽  
Obstructive Sleep

Objective: There is a high prevalence of obstructive sleep apnea (OSA) in pediatric and adult Down Syndrome (DS) patients that is refractory to adenotonsillectomy and continuous positive airway pressure. Newer treatment modalities have emerged with improved outcomes. The objective is to provide an updated systematic review and meta-analysis to analyze the clinical outcomes of OSA in pediatric and adult DS patients with hypoglossal nerve stimulation using Inspire, midline posterior glossectomy plus lingual tonsillectomy (MPG + LT), and combined genioglossus advancement plus radiofrequency (GGS + RF). Methods: A comprehensive literature search of PubMed and Google Scholar was performed followed by a meta-analysis. Studies with preoperative and post-operative Apnea Hypopnea Index (AHI) values were included with patients serving as their own control. Results: Across 5 studies, 56 patients were analyzed. The mean reduction in AHI was statistically significant before vs. after procedure ( P < .001 for hypoglossal nerve stimulation using Inspire with a paired 2-tailed t-test and P = .031 for MPG + LT). Although individual patient AHI values were unavailable in the GGS + RF study, the standard difference in mean AHI was also significant for GGS + RF with P = .001. Device malfunction was the most common complication for Inspire while postoperative bleeding was observed for MPG + LT and nasopharyngeal obstruction and retropalatal collapse were observed for GGS + RF. Conclusion: This review reveals significant improvement in AHI with Inspire, MPG + LT, and GGS + RF for DS patients with refractory OSA. Further investigation is needed for comparison between these 3 therapies.

818 A Ghost from the Past: Unmasked Insomnia Affecting Hypoglossal Nerve Stimulation Therapy Adherence

SLEEP ◽  
2021 ◽  
Vol 44 (Supplement_2) ◽  
pp. A319-A320
Author(s):  
Elena Stuewe ◽  
Aarti Grover ◽  
Peter Ostrow ◽  
Greg Schumaker ◽  
Joel Oster ◽  
...  
Keyword(s):  
Nerve Stimulation ◽  
Hypoglossal Nerve ◽  
Sleep Onset ◽  
Chronic Insomnia ◽  
Apnea Hypopnea Index ◽  
Therapy Adherence ◽  
Hypoglossal Nerve Stimulation ◽  
Obstructive Sleep ◽  
Patient Reported ◽  
History Of

Abstract Introduction Hypoglossal nerve stimulation (HNS) is an efficacious option for treating moderate to severe obstructive sleep apnea (OSA). However, there is sparse evidence regarding tolerance and adherence to HNS therapy in patients with a diagnosis of insomnia. Report of case(s) A 57-year-old man with well-controlled depression presented for evaluation for HNS therapy. He had been diagnosed with moderate OSA with an apnea-hypopnea index of 22/hour, intolerant of continuous positive airway pressure and mandibular advancement device. He underwent uvulopalatopharyngoplasty without significant improvement. At the time of initial evaluation, he denied history of insomnia and prior sleep aid use. He subsequently underwent successful HNS device implantation and activation. One week after HNS initiation, the patient reported new symptoms of significant difficulty with sleep onset and inability to fall back asleep, which was worse than his untreated OSA symptoms. Device interrogation did not reveal any hardware problems. Adjustments to start delay, pause time and device configuration with awake endoscopy did not improve tolerance. Subsequently, the patient disclosed a remote history of insomnia, which was treated with multiple hypnotics in addition to cognitive-behavioral therapy for insomnia (CBTi) and had resolved. He was diagnosed with recurrent chronic insomnia, for which eszopiclone was initiated without significant improvement. He eventually agreed to CBTi, with partial improvement in device tolerance and improvement in insomnia symptoms. Conclusion This case highlights that HNS therapy adherence can be affected by prior history of, or a current diagnosis of insomnia. Our patient had a predisposition for insomnia that was well controlled prior to HNS therapy initiation. The onset of recurrent insomnia with HNS activation suggests that HNS was a precipitating factor for his now chronic insomnia. Although there is insufficient evidence to suggest whether history of insomnia should affect the decision to initiate HNS therapy, this case illustrates the importance of screening for insomnia at pre-implant evaluation. Our center is now routinely screening for a history of insomnia to identify patients who may benefit from treatment prior to HNS implantation. Larger studies are needed to explore a possible relationship between insomnia and HNS adherence. Support (if any):

Hypoglossal Nerve Stimulation in Veterans with Obstructive Sleep Apnea

2019 ◽  
Vol 130 (9) ◽  
pp. 2275-2280 ◽  
Author(s):  
Kathleen M. Sarber ◽  
Katherine W. Chang ◽  
Madison V. Epperson ◽  
Meredith E. Tabangin ◽  
Mekibib Altaye ◽  
...  
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Nerve Stimulation ◽  
Hypoglossal Nerve ◽  
Hypoglossal Nerve Stimulation ◽  
Obstructive Sleep
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