Glymphatic dysfunction coincides with lower GABA levels and sleep disturbances in succinic semialdehyde dehydrogenase deficiency.

Succinic semialdehyde dehydrogenase deficiency (SSADHD) is an inherited metabolic disorder of γ-aminobutyrate (GABA) catabolism. Cerebral waste clearance along glymphatic perivascular spaces depends on aquaporin 4 (AQP4) water channels, the function of which was shown to be influenced by GABA. Sleep disturbances are associated independently with SSADHD and glymphatic dysfunction. This study aimed to determine whether indices of the hyperGABAergic state characteristic of SSADHD coincide with glymphatic dysfunction and sleep disturbances and to explicate the modulatory effect that GABA may have on the glymphatic system. The study included 42 individuals (21 with SSADHD; 21 healthy controls) who underwent brain MRIs and magnetic resonance spectroscopy (MRS) for assessment of glymphatic dysfunction and cortical GABA, plasma GABA measurements, and circadian clock gene expression. The SSADHD subjects responded to an additional Children's Sleep Habits Questionnaire (CSHQ). Compared with the control group, SSADHD subjects did not differ in sex and age but had a higher severity of enlarged perivascular spaces in the centrum semiovale (p < 0.001), basal ganglia (p = 0.01), and midbrain (p = 0.001), as well as a higher MRS-derived GABA/NAA peak (p < 0.001). Within the SSADHD group, the severity of glymphatic dysfunction was specific for a lower MRS-derived GABA/NAA (p = 0.04) and lower plasma GABA (p = 0.004). Additionally, the degree of their glymphatic dysfunction correlated with the CSHQ-estimated sleep disturbances scores (R = 5.18, p = 0.03). In the control group, EPVS burden did not correlate with age or cerebral and plasma GABA values. The modulatory effect that GABA may exert on the glymphatic system has therapeutic implications for sleep-related disorders and neurodegenerative conditions associated with glymphatic dysfunction.

Functional outcome after single-stage laryngotracheal reconstruction with rib cartilage grafting.

OBJECTIVE: Single-stage laryngotracheal reconstruction (SSLTR) provides a definite surgical treatment for patients with complex glotto-subglottic stenosis. To date, the influence of SSLTR on the functional outcome after surgery has not been analyzed. METHODS: A retrospective analysis of all patients receiving a SSLTR between November 2012 and October 2019 was performed. Preoperatively and 3 months postoperatively, patients received a full functional evaluation, including spirometry; voice measurements (eg, fundamental frequency; dynamic range, singing voice range, and perceptual voice evaluation using the Roughness-Breathiness-Hoarseness [RBH] score, and fiberoptic endoscopic evaluation of swallowing [FEES]). RESULTS: A total of 15 patients with a mean age of 45 ± 17 years underwent SSTLR. Two (13%) patients were men and 13 (87%) were women. The majority of patients (67%) had undergone previous surgical or endoscopic treatment attempts that had failed. At the 3-month follow-up visit, none of the patients had signs of penetration or aspiration in their swallowing examination. Voice measurements revealed a significantly lower fundamental voice frequency (201.0 Hz vs 155.5 Hz; P = .006), whereas voice range (19.1 semitones vs 14.9 semitones; P = .200) and dynamic range (52.5 dB vs 53.0 dB; P = .777) was hardly affected. The median RBH score changed from R1 B0 H1 to R2 B1 H2. In spirometry, breathing capacity increased significantly (peak expiratory flow, 44% vs 87% [P < .001] and mean expiratory flow at 75% of vital capacity, 48% vs 90% [P < .001]). During a median follow-up of 32.5 months (range, 7-88 months), none of the patients developed re-stenosis. CONCLUSIONS: For complex glotto-subglottic stenoses, durable long-term airway patency together with reasonable voice quality and normal deglutition can be achieved by SSLTR.

Presentation, Diagnosis, and Management of Subglottic and Tracheal Stenosis During Systemic Inflammatory Diseases.

BACKGROUND: Subglottic stenosis (SGS) and tracheal stenosis (TS) are characterized by a narrowing of the airways. The goal of this study was to describe the characteristics and prognosis of nontraumatic and nontumoral SGS or TS. RESEARCH QUESTION: What are the inflammatory etiologies of SGS and TS, and what are their characteristics and prognosis? STUDY DESIGN AND METHODS: This multicenter, observational retrospective study was performed in patients with SGS or TS that was neither traumatic nor tumoral. RESULTS: Eighty-one patients were included, 33 (41%) with granulomatosis with polyangiitis (GPA) and 21 (26%) with relapsing polychondritis (RP). GPA-related stenoses exhibited circumferential subglottic narrowing in 85% of cases, without calcifications. In contrast, RP-related stenoses displayed anterior involvement in 76%, in a longer distance from vocal cords (4 cm), with calcifications in 62%, and extension to bronchi in 86%. Other diagnoses included bullous dermatoses (n = 3), amyloidosis (n = 3), sarcoidosis (n = 2), and Crohn's disease (n = 2); the remaining stenoses (n = 15) were idiopathic. SGS/TS was the initial manifestation of the disease in 66% of cases, with a median interval from stenosis to disease diagnosis of 12 months (interquartile range, 0-48 months). Despite the use of glucocorticoids in 80%, combined with methotrexate in 49%, endoscopic procedures were required in 68% of patients. Relapses of stenoses occurred in 76% without any difference between causes (82% in GPA, 67% in RP, and 75% in idiopathic SGS/TS). Three patients died due to the stenosis, two of RP and one of GPA. INTERPRETATION: These data show that GPA and RP are the two main inflammatory diseases presenting with SGS/TS. GPA-related stenoses are mostly subglottic and circumferential, whereas RP-related stenoses are mostly tracheal, anterior, and calcified with a frequent extension to bronchi. Relapses of stenoses are common, and relapse rates do not differ between causes. Diagnosis and management of SGS/TS require a multidisciplinary approach.

Application of Montgomery T-Tube Placement in Treating Cotton-Myer IV Subglottic Airway Atresia after Bi-Level Airway Recanalization.

OBJECTIVE: The purpose of this study is to explore the effectiveness and safety of Montgomery T-tube placement in treating Cotton-Myer IV subglottic airway atresia after bi-level airway recanalization. METHODS: This study is a retrospective study. 11 patients who were treated for IV subglottic airway atresia between January 2017 and January 2019 in the Second Affiliated Hospital of Jiaxing University were involved in this study. The 11 patients all had undergone tracheotomies at our hospital, and they were transferred to the Department of Pulmonary and Critical Care Medicine for Montgomery T-tube placement after bi-level airway recanalization when their subglottic airway was atretic. Patients were observed for their clinical manifestations after placement. The effectiveness of T-tube placement after bi-level airway recanalization was assessed. The incidence of short-term and long-term complications after surgery was assessed. Patients were followed up for 3 to 24 months for evaluating their airway recovery. RESULTS: T-tubes were successfully placed in 11 patients. The atretic airways of all patients were recanalized after treatment. Eight patients got restoration of vocal ability, and 3 patients could only say simple words. None of the patients needed assisted oxygen inhalation. The SpO2 average level was increased from 95 ± 2% before treatment to 97 ± 3% after treatment. Patients had significant relief of cough or sputum, and they had less difficulty in dyspnea. All short- or long-term complications were self-relieved or controlled without further malignant progression after treatment by doctors. The average postoperative extubating time was (14.86 ± 3.62) months. CONCLUSION: The application of Montgomery T-tube placement in treating Cotton-Myer IV subglottic airway atresia after bi-level airway recanalization is well effective and safe for patients, and it can be promoted in clinical treatment.

Voice-related quality of life: Relation to objective spirometry measures in subglottic stenosis.

OBJECTIVES: The current study seeks to identify the correlation between in-office spirometry data and voice-related quality of life in patients with subglottic stenosis (SGS). METHODS: Patients with SGS of any etiology were included when in-office spirometric data was available in addition to voice-related patient-reported outcomes (PROM) data in the form of the Voice Handicap Index-10 (VHI-10) and/or the Voice-Related Quality of Life (V-RQOL) survey. Overall survey scores and individual question responses were assessed for degree of correlation to spirometric data. RESULTS: Twenty-nine patients were included in the final analysis. Overall mean total VHI-10 scores totaled 7.15 (SD 9.11), while mean overall V-RQOL scores totaled 78.41 (SD 16.45). Both PEF and PIF rates correlated to total scores on the VHI and V-RQOL surveys. This correlation was stronger with PIF than with PEF, and with the V-RQOL than with the VHI. Questions related to breathlessness most closely correlated with spirometric data. CONCLUSION: Voice-related QOL is impacted in patients with SGS in a predictable way. Breathlessness while speaking may be more impactful than inability to produce speech in this population.

Long-term prognostic factors of clinical success after interventional bronchoscopy in patients with scarring central airway stenosis.

BACKGROUND: Scarring central airway stenosis (SCAS) is a potentially life-threatening condition with debilitating symptoms. Interventional bronchoscopy is increasingly used to relieve symptoms in patients with SCAS, but recurrent stenosis is frequently observed. Little data exist on the long-term prognosis of interventional bronchoscopy for SCAS. We aimed to assess the prognostic factors of bronchoscopic interventions in patients with SCAS to optimize treatment. METHODS: This was a retrospective study that enrolled 119 consecutive patients with SCAS from January 2010 to April 2019 at our institution. Long-term clinical success was defined as airway stenosis < 50%, no limitation of physical activity, and a stable condition for > 12 months after the last interventional procedure. We compared patients' demographics, airway stenosis characteristics, and interventional procedures between the successful and unsuccessful groups, and identified significant predictors of long-term outcome with univariate and multivariate logistic regression. RESULTS: A total of 119 patients with 577 therapeutic bronchoscopies were included. Seventy-five (63%) patients were considered to have long-term clinical success. Older age, male gender, smoking, elevated C-reactive protein level, subglottic stenosis, stent or T-tube implantation, previous interventional treatment, and multiple procedures per year were potentially associated with unsuccessful long-term outcomes in the univariate analysis. Current smoker status (odds ratio [OR] 5.70, 95% confidence interval [CI] 1.35-24.17, P = 0.018), subglottic stenosis (OR 4.35, 95% CI 1.31-14.46, P = 0.017), and stent implantation (OR 4.96, 95% CI 1.33-18.48, P = 0.017) were associated with decreased odds of long-term success in the multivariate logistic regression analysis. Of note, there was no significant difference in odds of success between former smokers and nonsmokers. CONCLUSIONS: Current smoker status, subglottic stenosis, and stent implantation are independent factors associated with reduced long-term efficacy of interventional bronchoscopy for SCAS. Smoking cessation should be encouraged to improve the outcome of therapeutic bronchoscopy.

Can the Expiratory Disproportion Index Distinguish PVFMD from Subglottic Stenosis in Obese Patients?

OBJECTIVES: Expiratory disproportion index (EDI) is the ratio of forced expiratory volume in 1 second (FEV1) divided by peak expiratory flow rate (PEFR) multiplied by 100. Prominent EDI (>50) values can differentiate subglottic stenosis (SGS) from paradoxical vocal fold movement disorder (PVFMD), but this has not been verified when considering body habitus. We hypothesize that the predictive value of elevated EDI in differentiating SGS from PVFMD will be lower in obese patients than non-obese patients. METHODS: Patients ≥ 18 years old with recorded PFT values, BMI, and airway imaging were reviewed retrospectively from 01/2011 to 10/2018. EDI was recorded for 4 cohorts: non-obese/SGS, non-obese/ PVFMD, obese/SGS, and obese/ PVFMD, to determine the mean EDI and the sensitivity/specificity of an elevated EDI. RESULTS: Mean EDI values were 69.32 and 48.38 in the non-obese SGS and PVFMD groups, respectively (P < .01). They were 58.89 and 47.67 in the obese SGS and PVFMD groups, respectively (P < .05). At a threshold of >50, EDI had a sensitivity of 90.0% and specificity of 51.6% in differentiating between SGS and PVFMD cases in non-obese patients and 51.6% and 63.6% in obese patients. CONCLUSION: Prior literature has established that EDI can distinguish SGS from PVFMD in the general population. Our results show that the mean EDI values were significantly different in both cohorts, but an elevated EDI was not as sensitive at identifying SGS cases in obese patients. This suggests that the EDI should be used with caution in obese patients and should not be relied upon to rule out SGS. LEVEL OF EVIDENCE: 3.

Impact of the COVID-19 Pandemic on Patients With Idiopathic Subglottic Stenosis.

OBJECTIVES: To determine the number of patients with idiopathic subglottic stenosis (iSGS) who have contracted coronavirus disease 2019 (COVID-19), the impact of the pandemic on patients' attitudes on seeking help and attending hospitals, as well as the delays in the offer of treatment from the local health care systems. METHODS: A 29-question survey was distributed to an international mailing list of patients with subglottic stenosis to assess the patient experience during the COVID-19 pandemic. RESULTS: A total of 543 patients with iSGS participated. Fewer than 1 in 10 patients with iSGS have experienced COVID-19 symptoms, which were predominantly mild to moderate, with only 2 hospitalizations. Most patients with iSGS (80.0%) have not been advised they are high risk for COVID-19, despite 36.5% of patients with iSGS being obese (body mass index of 30+). Delays to surgeries and in-office procedures have impacted 40.1% of patients currently receiving treatment, with 38.8% of patients increasingly struggling to breathe as a result. Anxiety and stress are increasing among patients, with 3 in 4 (75.2%) reporting they are anxious about travelling by public transport, contracting the virus in hospital and infecting loved ones (69.0% and 71.9%, respectively). Of greater concern is that 23.1% with increasing dyspnea state they are staying away from hospital despite their deteriorating health. CONCLUSIONS: The COVID-19 pandemic has had an impact on the physical and psychological health of patients with iSGS. Surgeons managing cases of laryngotracheal stenosis need to offer appropriate support and communication to these high risk patients. During the pandemic, this should include self-isolation if they are dyspneic or on treatments that may have reduced their immunity. In addition, they should offer safe clinical pathways to airway assessment and treatments, if they become necessary. To minimize unnecessary travel, much of the clinical monitoring can be carried out remotely, using telephone or video-based consultations, in conjunction with local health professionals.

Subglottic Stenosis Position Affects Work of Breathing.

OBJECTIVES: Subglottic stenosis (SGS) is the most common type of laryngeal stenosis in neonates. SGS severity is currently graded based on percent area of obstruction (%AO) via the Myer-Cotton grading scale. However, patients with similar %AO can have widely different clinical courses. Computational fluid dynamics (CFD) based on patient-specific imaging can quantify the relationship between airway geometry and flow dynamics. We investigated the effect of %AO and axial position of SGS on work of breathing (WOB) in neonates using magnetic resonance imaging. METHODS: High-resolution ultrashort echo-time MRI of the chest and airway was obtained in three neonatal patients with no suspected airway abnormalities; images were segmented to construct three-dimensional (3D) models of the neonatal airways. These models were then modified with virtual SGSs of varying %AO and axial positioning. CFD simulations of peak inspiratory flow were used to calculate patient-specific WOB in nonstenotic and artificially stenosed airway models. RESULTS: CFD simulations demonstrated a relationship between stenosis geometry and WOB increase. WOB rapidly increased with %AO greater than about 70%. Changes in axial position could also increase WOB by approximately the same amount as a 10% increase in %AO. Increased WOB was particularly pronounced when the SGS lumen was misaligned with the glottic jet. CONCLUSION: The results indicate a strong, predictable relationship between WOB and axial position of the stenotic lumen relative to the glottis, which has not been previously reported. These findings may lead to precision diagnosis and treatment prediction tools in individual patients. LEVEL OF EVIDENCE: 4 Laryngoscope, 131:E1220-E1226, 2021.

Voice-Related Quality of Life Is Associated with Postoperative Change in Subglottic Stenosis.

OBJECTIVES: To characterize the impact of subglottic stenosis (SGS) on voice-related quality of life (V-RQOL) and quantify the effect of treatment on voice outcomes. STUDY DESIGN: Case series. METHODS: Retrospective review of SGS patients treated from 1996 to 2018 at a single institution to assess for 1) V-RQOL association with individual patient cumulative treatment number and 2) V-RQOL correlation with treatment type, time between treatments, and degree of stenosis. Analysis included both parametric and nonparametric statistical comparison across treatment types and multivariable and univariate linear regression. RESULTS: Sixty-one patients, predominantly white (93%) and female (93%), were included. Etiology of SGS included idiopathic (61%), iatrogenic (16%), granulomatosis with polyangiitis (16%), and other (7%). The plurality of patients had four or more treatments (44%), with the remainder having one (28%), two (13%), or three treatments (15%). Analysis of change between pre- and postoperative V-RQOL scores was completed for 130 treatments. These included dilation with laser incision (52%), in-office injection (34%), dilation without division (8%), cricotracheal resection (1%), and all other treatment (8%). For every 10% improvement in airway caliber postoperatively, there was a 1.3-point improvement in calculated V-RQOL (r = 0.27, P = .02). After adjustment for treatment type, age, sex, and SGS etiology, this association held (beta = 1.5, P = .02). Change in V-RQOL was not associated with treatment type, treatment number, or time between treatments. CONCLUSION: Patients with subglottic stenosis who have greater degree of change in airway caliber experience greater improvement in V-RQOL scores following treatment. V-RQOL scores are not associated with treatment type or time between individual treatments. LEVEL OF EVIDENCE: 4 Laryngoscope, 131:360-365, 2021.

Inducible laryngeal obstruction: Endoscopic quantitative analysis of glottic aperture.

OBJECTIVES: Using a method developed for this study, the objective was to perform a quantitative analysis of glottic aperture during the respiratory cycle in subjects suspected of having inducible laryngeal obstruction (ILO) and to compare results to healthy individuals. Correlations between glottic aperture and spirometric parameters were assessed. METHODS: Subjects with high clinical suspicion of ILO and atypical inspiratory findings in spirometry had the images of their laryngoscopy displayed alongside a respiratory flow chart and both were recorded simultaneously. This method allowed detailed analysis of the glottic aperture by measuring the angle of the anterior commissure during inspiration and expiration. Healthy volunteers who performed the same tests and agreed to provide data to this study were used as a control group. RESULTS: All 15 subjects with ILO and 16 healthy participants were evaluated successfully using the proposed method. Measures of the anterior commissure angle in the ILO versus control group were significantly different in all observed parameters and just three ILO subjects had an anterior commissure closure greater than 50% during the respiratory cycle. Inspired volume (FIF50 ) and mid-vital capacity ratio (FEF50 /FIF50 ) had a significant correlation with glottic aperture parameters when considering the evaluation of the subjects all together. CONCLUSION: The proposed method provided precise and quantitative analysis of glottic aperture during the respiratory cycle thus indicating that the usage of equipment that allows for such assessment should be encouraged. Also, the threshold of vocal cords closure accepted as indicative of ILO should be reconsidered, especially during the intercritical period of the disease. LEVEL OF EVIDENCE: 4 Laryngoscope, 130:E349-E356, 2020.

Validation of the Normalized Laryngeal Constriction Ratio in Normal and Disordered Swallowing.

PURPOSE: The timing of laryngeal vestibule closure (LVC) is important for airway protection during swallowing. However, it is unknown whether the extent of LVC contributes to airway protection. The goal of this study is to validate the extent of LVC via a measure called laryngeal constriction ratio (LCR). METHODS: A retrospective analysis of videofluoroscopic swallows was conducted on 38 stroke participants and 40 healthy controls. The LCR was calculated by deriving a size-normalized area of airspace from a 1) maximum closed laryngeal vestibule and a 2) maximum open laryngeal airspace (at rest). Airway invasion severity was derived via the Penetration-Aspiration Scale score. RESULTS: Six hundred forty-nine videofluoroscopic swallows were analyzed. A mixed model analysis revealed a statistically significant mean difference between the normalized laryngeal constriction ratios of healthy individuals (mean (m) = 0.003) versus older dysphagic patients (m = .026) (P = 0.001), quantifying less closure in older patients with dysphagia. Additionally, swallows with airway compromise had a statistically worse LCR when compared to swallows without airway compromise (P = 0.001). CONCLUSION: The normalized LCR might be a valid fluoroscopic surrogate measure for LVC and, furthermore, airway compromise during swallowing. By investigating spatial measurements in the laryngeal vestibule during safe and unsafe swallows, the LCR provides a direction for further research to allow for critical examination of the physiology relating to closure degree in order to precisely detect and treat abnormalities during swallowing. LEVEL OF EVIDENCE: 4 Laryngoscope, 130:E190-E198, 2020.

Office-Based Steroid Injections for Idiopathic Subglottic Stenosis: Patient-Reported Outcomes, Effect on Stenosis, and Side Effects.

OBJECTIVE: Office-based steroid injection has shown promise for idiopathic subglottic stenosis (iSGS). It is important to understand safety and patient-lived experience. We report patient experience related to airway restriction, voice, and side effects. METHODS: Sixteen patients (51 ± 14 years) with mild-moderate (20-50%) stenosis undergoing office-based transnasal steroid injections were included; fourteen had prior operations. Patients typically underwent three injections, 1 month apart, followed by transnasal tracheoscopy 1 month later to evaluate outcome; number of injections can vary based on disease severity and response. Outcomes were Dyspnea Index (DI), Modified Medical Research Council (MMRC) dyspnea scale, voice handicap index-10 (VHI-10), and degree of stenosis (estimated from procedural video). At each visit, patients were queried about post-injection airway restriction and side effects. Paired t-tests compared values at baseline versus follow-up tracheoscopy. RESULTS: DI decreased (t = 3.938, P = 0.0013), as did MMRC (t = 2.179, P = 0.0457). There was no change in VHI-10 (t = 1.354; P = 0.1957) scores. Airway stenosis decreased (t = 4.331; P = 0.0006); this was not correlated with change in DI (r = 0.267, P = 0.318). Side effects included airway restriction lasting <48 hours (n = 5), cough (n = 3), and nasal pain (n = 2). CONCLUSION: Steroid injections improved upper airway symptoms. Side effects were mild and transient. Improvement in DI did not correlate with percent stenosis.

The Role of Spirometry and Dyspnea Index in the Management of Subglottic Stenosis.

OBJECTIVES: We aimed to assess the role of spirometry measures and Dyspnea Index (DI) in response to treatment of subglottic stenosis (SGS) and ability to predict need for surgery. We also assessed correlations between spirometry measures, DI, and physical SGS parameters. METHODS: Thirty-seven adult female SGS patients were prospectively enrolled. Spirometry data and DI were obtained at serial clinic visits; physical SGS parameters were obtained intraoperatively. PIFR, PEFR, EDI, FEV1/FVC, and DI were compared preoperatively to postoperatively for patients who underwent operative intervention. Spirometry data, DI, and physical SGS parameters were analyzed for correlations, and receiver operating characteristic (ROC) curves were created for spirometry measures and DI to determine optimal cutoffs for recommending surgery. RESULTS: Means of all measured spirometry measures changed significantly from preoperative to postoperative visits (P < .05). Mean DIs changed significantly between preoperative (27.5, n = 13, SD = 8.6) and postoperative visits (8.6, n = 13, SD = 5.5, P < 5 × 10-5 ). All Pearson correlations were negligible to moderate. The area under the curve (AUC) for peak inspiratory flow rate (PIFR) was 0.903 (95% CI, 0.832-0.974) with cutoff at 2.10 L/s; the AUC for DI was 0.874 (95% CI, 0.791-0.956) with cutoff between 22-25; the AUC for peak expiratory flow rate (PEFR) was 0.806 (95% CI, 0.702-0.910) with cutoff at 2.5 L/s; all other ROC curves were less than good. CONCLUSION: PIFR, PEFR, EDI, FEV1/FVC, and DIs significantly improve after treatment for SGS. No strong correlations exist between spirometry measures, DI, and physical SGS parameters. PIFR was the most sensitive and specific for predicting timing of operative intervention in our cohort. LEVEL OF EVIDENCE: 1b Laryngoscope, 2019.

Type I Posterior Glottic Stenosis: Natural History and In-Office Management.

OBJECTIVES: To review the natural history of type I posterior glottic stenosis (PGS-I) and its treatment outcomes through a case presentation and demonstrate the feasibility of in-office management of PGS-I. METHODS: The case of a middle-aged woman who developed PGS-I after prolonged intubation is presented. A review of the literature on management and treatment outcomes of PGS-I is also performed. RESULTS: Initially presenting with a large granuloma that failed conservative management, the patient deferred surgical intervention and developed unilateral vocal fold hypomobility with posterior glottic synechia. The adhesion was successfully ablated in the office with potassium-titanyl-phosphate (KTP) laser; however, vocal fold hypomobility persisted after treatment. CONCLUSIONS: This case illustrates the natural history of the development of PGS-I, demonstrates the feasibility of office-based management of this condition, and provides further evidence that lysis of PGS-I synechia does not uniformly lead to restoration of normal laryngeal function and mobility.

Novel Pulmonary Function Parameter Shifts in High-Grade Upper Airway Stenoses.

Upper airway stenosis (UAS) is a common problem for anesthesiologists in laryngology as well as head and neck surgery, but it may lead to life-threatening situations if it is undetected. This retrospective case series was performed on patients who had UAS and presented with severe dyspnea or encountered difficulties in airway management. To assess the severity of UAS, the degree of stenosis was calculated using computed tomography scans and direct endoscopy. Lung function test was collected, and measured values were extracted as percentage of predicted reference values. Lower and higher grade stenoses were defined by Cotton-Myer classification and median degree of stenosis. Median of detected stenoses was 73% (64%-85%), with 7 of 10 patients classified as Cotton-Myer grade 3. Lung function tests showed typical parameter shifts as known from obstructive pulmonary diseases (OPDs). Furthermore, statistical analyses showed a significant higher value of residual volume (RV)/total lung capacity (TLC) in patients with higher grade stenosis (P < .05), whereas forced expiratory volume in 1 second /vital capacity (FEV1/VC) did not show a significant difference in same subgroups. In conclusion, the elevation of RV/TLC with concomitant normal FEV1/VC in symptomatic patients could be used to demarcate rare UAS from common OPD. Moreover, RV-TLC ratio might be used to distinguish between low- and high-grade UAS. But further epidemiological studies will be necessary to validate these findings. Level of evidence: 4.

Nebulizer Use in Adults With Subglottic Stenosis: A Survey Study.

OBJECTIVE:: People with subglottic stenosis (SGS) may experience laryngeal symptoms that pose significant challenges to management. This study surveyed the use and effects of nebulized treatments on laryngeal symptoms in a large cohort of adults with SGS. METHODS:: A survey of nebulized treatment practices was distributed to an online international community of over 2000 members; 316 individuals (298 female, 1 male, 17 declined to specify; age 25+ years) completed the survey. RESULTS:: Nearly half (144) of participants had tried a nebulizer in the past. Among those, half currently used nebulized treatments; the majority used these treatments regularly and for greater than 1 year. The most frequently reported treatments included isotonic saline (0.9% Na+Cl-) or hypertonic saline (3% Na+Cl-). Symptoms improved by these treatments included thick mucus (69%), cough (57%), throat dryness (31%), stridor (28%), and voice (15%). The most frequently reported limitations to nebulizer use included time, noise, and portability. CONCLUSION:: Among those individuals with SGS who have tried nebulized treatments, nearly half experienced relief from secondary laryngeal symptoms. Additional efficacy research is needed, particularly with respect to treatment type and dosage. The results are encouraging given the adverse impact these laryngeal symptoms can have on activities of daily living and quality of life.

Cricoarytenoid Joint Ankylosis: Classification and Transoral Laser Microsurgical Treatment.

OBJECTIVE: This study aimed to describe a graduated approach for effective transoral mobilization of cricoarytenoid joint ankylosis (CJA) in the context of the Bogdasarian system of classifying posterior glottic web-based stenosis (PGWS). STUDY DESIGN: This is a retrospective cohort study through data from medical records and operative notes. A consecutive series of 23 patients who underwent reconstructive transoral laser microsurgery for PGWS with a significant degree of CJA (Bogdasarian grade III-IV) was included in the study. METHODS: Techniques necessary to remobilize their cricoarytenoid joints were reviewed in the context of the extent of scar tissue found. RESULTS: Arytenoids with CJA were successfully mobilized by resection of the fused portion of the cricoid and arytenoid cartilages achieving respiratory improvements as well as decannulation of tracheostomy-dependent patients. The majority (83%) of patient's voices improved. All patients tolerated a full diet after the procedures. Cases with Bogdasarian grade III PGWS with minor unilateral fixation should be classified as IIIa. If the fixation is severe, the case should be classified as a grade IIIb. Grade IVa would indicate that both sides were mildly to moderately ankylosed, and grade IVb involves ankylosis of both joints with subtotal or complete fusion of at least one; it presents the greatest surgical challenge. CONCLUSION: We provided effective transoral techniques for the re-mobilization of cricoarytenoid joint, along with a classification of CJA that aims to standardize the severity of disease in the context of the existing and widely accepted Bogdasarian scale.

Gasping for a Diagnosis: Pediatric Vocal Cord Dysfunction.

Vocal cord dysfunction is an obstruction of the upper airway, primarily on inspiration, due to the paradoxical adduction of the vocal cords. Vocal cord dysfunction continues to be underdiagnosed as its own entity. The lack of diagnosis can be attributed to the overlap of symptoms between asthma and exercise-induced bronchospasm. It is possible for patients diagnosed with asthma and/or exercise-induced bronchospasm to have underlying vocal cord dysfunction, which needs to be considered when prescribing asthma medications. This article will review the history of vocal cord dysfunction, the differential diagnosis, diagnostic testing, and the role of the nurse practitioner in caring for these patients.