Comparison Between Custom Smartphone Acoustic Processing Algorithms and Praat in Healthy and Disordered Voices.

OBJECTIVE: The aim of this study was to understand the relationship between temporal and spectral-based acoustic measures derived using Praat and custom smartphone algorithms across patients with a wide range of vocal pathologies. METHODS: Voice samples were collected from 56 adults (11 vocally healthy, 45 dysphonic, aged 18-80 years) performing three speech tasks: (a) sustained vowel, (b) maximum phonation, and (c) the second and third sentences of the Rainbow passage. Data were analyzed to extract mean fundamental frequency (fo), maximum phonation time (MPT), and cepstral peak prominence (CPP) using Praat and our custom smartphone algorithms. Linear regression models were calculated with and without outliers to determine relationships. RESULTS: Statistically significant relationships were found between the smartphone algorithms and Praat for all three measures (r2 = 0.68-0.95, with outliers; r2 = 0.80-0.98, without outliers). An offset between CPP measures was found where Praat values were consistently lower than those computed by the smartphone app. Outlying data were identified and described, and findings indicated that speakers with high levels of clinician-perceived dysphonia resulted in smartphone algorithm errors. CONCLUSIONS: These results suggest that the proposed algorithms can provide measurements comparable to clinically derived values. However, clinicians should take caution when analyzing severely dysphonic voices as the current algorithms show reduced accuracy for measures of mean fo and MPT for these voice types.

Impact of naturalistic smartphone positioning on acoustic measures of voicea).

Smartphone technology has been used for at-home health monitoring, but there are few available applications (apps) for tracking acoustic measures of voice for those with chronic voice problems. Current apps limit the user by restricting the range of smartphone positions to those that are unnatural and non-interactive. Therefore, we aimed to understand how more natural smartphone positions impacted the accuracy of acoustic measures in comparison to clinically acquired and derived measures. Fifty-six adults (11 vocally healthy, 45 voice disordered, aged 18-80 years) completed voice recordings while holding their smartphones in four different positions (e.g., as if reading from the phone, up to the ear, etc.) while a head-mounted high-quality microphone attached to a handheld acoustic recorder simultaneously captured voice recordings. Comparisons revealed that mean fundamental frequency (Hz), maximum phonation time (s), and cepstral peak prominence (CPP; dB) were not impacted by phone position; however, CPP was significantly lower on smartphone recordings than handheld recordings. Spectral measures (low-to-high spectral ratio, harmonics-to-noise ratio) were impacted by the phone position and the recording device. These results indicate that more natural phone positions can be used to capture specific voice measures, but not all are directly comparable to clinically derived values.

A Novel Instrument Holder to Improve Operative Efficiency in Endoscopic Laryngeal and Airway Surgery.

OBJECTIVE: Receiving instruments from surgical technicians during endoscopic laryngeal and airway microsurgery (ELAM) has challenges including repeated, expeditious handling of delicate instruments and passing them to the surgeon's hand opposite of where the surgical assistant is standing. Optimizing this interaction may reduce surgical errors and improve operative efficiency. METHODS: A proprietary ELAM instrument holder was attached to both sides of the operating room bed. The device consisted of an articulating arm with custom silicone inserts mounted on a tray (storing up to three endoscopic instruments). ELAM cases were randomized to be performed either with (device) or without the holder (control). Using custom software, instrument pass time (IPT), instrument drop rate (IDR), and communication errors (eg handing incorrect instruments) were manually recorded. Qualitative use metrics relating to overall device satisfaction were also obtained. RESULTS: Data were collected from 25 device and 23 control cases among three different laryngologists. Average IPT was nearly three times quicker for the device (0.80 s, n = 1175 passes) compared with controls (2.09 s, n = 1208 passes) [p < 0.001]. IPT interquartile range was five times higher for control (1.65 s) versus device cases (0.42 s). IDR was not significantly different [p = 0.48]; however, device cases had significantly lower communication errors compared to control cases [p = 0.01]. Surgeons and surgical assistants were similarly satisfied with the device on a 5-point Likert scale (mean: 4.2/5, standard deviation: 0.92). CONCLUSION: The proposed endoscopic instrument holder can improve ELAM operative workflow by reducing instrument passing time and variability without increasing IDR. LEVEL OF EVIDENCE: 2 Laryngoscope, 133:3492-3498, 2023.

Interim Results of a Phase 1/2 Open-Label Study of INO-3107 for HPV-6 and/or HPV-11-Associated Recurrent Respiratory Papillomatosis.

OBJECTIVE: To evaluate the safety, immunogenicity, and efficacy of INO-3107, a DNA immunotherapy designed to elicit targeted T-cell responses against human papillomavirus (HPV) types 6 and 11, in adult patients with recurrent respiratory papillomatosis (RRP; NCT04398433). METHODS: Eligible patients required ≥2 surgical interventions for RRP in the year preceding dosing. INO-3107 was administered by intramuscular (IM) injection followed by electroporation (EP) on weeks 0, 3, 6, and 9. Patients underwent surgical debulking within 14 days prior to first dose, with office laryngoscopy and staging at screening and weeks 6, 11, 26, and 52. Primary endpoint was safety and tolerability, as assessed by treatment-emergent adverse events (TEAEs). Secondary endpoints included frequency of surgical interventions post-INO-3107 and cellular immune responses. RESULTS: An initial cohort of 21 patients was enrolled between October 2020 and August 2021. Fifteen (71.4%) patients had ≥1 TEAE; 11 (52.4%) were Grade 1, and 3 (14.3%) were Grade 3 (none treatment related). The most frequently reported TEAE was injection site or procedural pain (n = 8; 38.1%). Sixteen (76.2%) patients had fewer surgical interventions in the year following INO-3107 administration, with a median decrease of 3 interventions versus the preceding year. The RRP severity score, modified by Pransky, showed improvement from baseline to week 52. INO-3107 induced durable cellular responses against HPV-6 and HPV-11, with an increase in activated CD4 and CD8 T cells and CD8 cells with lytic potential. CONCLUSION: The data suggest that INO-3107 administered by IM/EP is tolerable and immunogenic and provides clinical benefit to adults with RRP. LEVEL OF EVIDENCE: 3 Laryngoscope, 133:3087-3093, 2023.

Early-Stage Glottic Carcinoma in the United States: Demographics and Treatment Choice.

OBJECTIVE: Limited investigation of factors potentially contributing to treatment choice in early-stage glottic carcinoma (EGC) has been performed with large-scale data. The National Cancer Database (NCDB) represents >72% of all new cancer cases in the United States. We hypothesized that NCDB variables may lend insight into treatment decisions between surgery and radiation for EGC. METHODS: The NCDB was queried for all cases of T1-2  N0  M0 glottic carcinoma from 2004 to 2016. We used multivariable logistic regression analysis to examine factors associated with first-line treatment modality: radiation therapy (RT) versus surgery. All reported odds ratios (OR) were adjusted for age, gender, race, insurance, residence in a metropolitan area, region, and facility volume. RESULTS: 34,991 EGC patients received treatment: 6,687 (19%) surgery; 20,289 (58%) RT; and 8,015 (23%) surgery and RT. OR for receiving RT (vs. surgery alone) were >2 for: more advanced T stage cancers (OR 2.5 [95%CI: 2.3, 2.7]), treatment at non-academic facilities (OR 2.8, [95%CI: 2.6, 3.0]), and shorter travel distances to treatment centers (OR 2.2, [95%CI: 2.0, 2.4]). Surgery was more likely with treatment in the western US, higher income, private insurance, living in a metropolitan (vs. non-metropolitan) area, female gender, older age, and low facility volume. Hispanic ethnicity, education level, and race were not associated with treatment type in the multivariable model. CONCLUSION: Most patients in the NCDB receive first-line treatment with radiation for EGC, and this decision is associated with various tumor, patient, and treatment facility characteristics. LEVEL OF EVIDENCE: 4 Laryngoscope, 133:901-907, 2023.

Surgical Treatment of Acquired Velopharyngeal Insufficiency in Adults With Dysphagia and Dysphonia.

OBJECTIVES: Velopharyngeal insufficiency (VPI) is a form of velopharyngeal dysfunction caused by abnormal or insufficient anatomy. This process is known to be associated with dysphagia and dysphonia but surgical interventions for these complex patients have not been well studied. The current study characterized a small cohort of adult patients with acquired VPI, dysphonia, and dysphagia, as well as associated surgical interventions. METHODS: A retrospective descriptive case series of 22 (N = 22) adult patients over a 6-year period with acquired VPI and varying degrees of dysphagia and dysphonia was described from a multi-disciplinary voice and swallowing clinic. Perceptual assessment, nasopharyngoscopy, fluoroscopic swallowing assessment, and patient reported outcomes were reviewed to characterize the cohort. RESULTS: VPI etiologies included: stroke (n = 4), head and neck cancer (n = 5), brainstem lesions (n = 5), trauma (n = 5), and other/unknown (n = 3). All 22 patients underwent nasopharyngoscopy and were categorized as having unilateral (n = 13), central (n = 4), or no (n = 5) velopharyngeal deficits. Seventeen patients (77.2%) underwent modified barium swallow studies, revealing that soft palate elevation scored least impaired among patients with no VPI, and most impaired among patients with unilateral VPI deficits. All 22 patients underwent some form of surgical intervention for VPI, with 14 (63.6%) of those patients requiring additional surgical revision. CONCLUSION: This series is one of the first to the authors' knowledge to characterize a cohort of individuals with VPI, dysphagia, and dysphonia and associated surgical interventions.

Vocal Fold Cyst Formation after Photoangiolytic KTP Laser Treatment of Early Glottic Cancer.

OBJECTIVE: The incidence of post-operative glottic cyst (POGC) formation in patients treated with transoral laser microsurgery with potassium-titanyl-phosphate laser (TLM-KTP) photoablation of early glottic carcinoma (EGC) has not previously been described. METHODS: A retrospective chart review was performed to identify all patients with early glottic cancer who underwent with single-modality TLM-KTP at our institution. Each patient received regular follow up with videostroboscopy for tumor surveillance. New glottic cysts seen on surveillance examinations were noted and their management was documented. RESULTS: A total of 33 patients met inclusion criteria. Eight patients (24%) developed POGC's within the original geographic perimeter of the cancerous vocal fold(s): 6 in the infraglottic region and 2 near the vocal process, at an average of 8 months after their initial cancer surgery. Of these 8 POGC's, 7 were at the periphery of the original tumor distribution and 1 was in the center of it. No POGC's were associated with any change in voice. Four of the 8 POGC's were phonosurgically excised, all without evidence of malignancy on pathology. The remaining 4 were monitored: 2 were stable for an average of 49 months of follow up; the remaining 2 resolved spontaneously by 7 and 31 months after first identification. CONCLUSIONS: POGC's are a frequent sequela of TLM-KTP for EGC. While these results suggest that they are unlikely to represent submucosal recurrences, surgeons should have a low threshold to biopsy if there is clinical concern for such and should counsel patients pre-operatively about the potential for their formation.

Systemic Bevacizumab for Treatment of Respiratory Papillomatosis: International Consensus Statement.

OBJECTIVES/HYPOTHESIS: The purpose of this study is to develop consensus on key points that would support the use of systemic bevacizumab for the treatment of recurrent respiratory papillomatosis (RRP), and to provide preliminary guidance surrounding the use of this treatment modality. STUDY DESIGN: Delphi method-based survey series. METHODS: A multidisciplinary, multi-institutional panel of physicians with experience using systemic bevacizumab for the treatment of RRP was established. The Delphi method was used to identify and obtain consensus on characteristics associated with systemic bevacizumab use across five domains: 1) patient characteristics; 2) disease characteristics; 3) treating center characteristics; 4) prior treatment characteristics; and 5) prior work-up. RESULTS: The international panel was composed of 70 experts from 12 countries, representing pediatric and adult otolaryngology, hematology/oncology, infectious diseases, pediatric surgery, family medicine, and epidemiology. A total of 189 items were identified, of which consensus was achieved on Patient Characteristics (9), Disease Characteristics (10), Treatment Center Characteristics (22), and Prior Workup Characteristics (18). CONCLUSION: This consensus statement provides a useful starting point for clinicians and centers hoping to offer systemic bevacizumab for RRP and may serve as a framework to assess the components of practices and centers currently using this therapy. We hope to provide a strategy to offer the treatment and also to provide a springboard for bevacizumab's use in combination with other RRP treatment protocols. Standardized delivery systems may facilitate research efforts and provide dosing regimens to help shape best-practice applications of systemic bevacizumab for patients with early-onset or less-severe disease phenotypes. LEVEL OF EVIDENCE: 5 Laryngoscope, 131:E1941-E1949, 2021.

KTP Laser Treatment of Early Glottic Cancer: A Multi-Institutional Retrospective Study.

OBJECTIVES: The primary objectives were to report oncologic outcomes of transoral laser microsurgery with potassium-titanyl-phosphate (KTP) laser (TLM-KTP) ablation of early glottic cancer (EGC). The secondary objectives were to report vocal outcomes and to analyze factors that might influence outcomes. METHODS: A multi-institutional, retrospective analysis of consecutive patients treated for T1 or T2 glottic squamous cell carcinoma undergoing TLM-KTP ablation with at least 2 years of follow-up was performed. Patients with prior radiation or surgery for laryngeal disease were excluded. PRIMARY OUTCOME MEASURES INCLUDED: surgical failures requiring radiation or laryngectomy, disease-specific survival (DSS), and overall survival (OS). Secondary outcome measures included: pre- and postoperative Voice Handicap Index-10 (VHI-10) scores. The effects of smoking status, stage, and anterior commissure involvement on outcomes were analyzed. RESULTS: Overall 88 patients met inclusion criteria (83% male, 79.5% current or former smokers). Mean age was 68 (standard deviation (SD): 12). Mean follow-up was 39.5 months (SD: 15.3). Staging included 50 T1a, 21 T1b, and 20 T2 tumors, including three metachronous second primaries. Radiation and/or laryngectomy avoidance was achieved in 87/88 (98.9%) of patients, inclusive of 24 patients requiring KTP re-treatments. Two patients had biopsy-proven recurrence (2.3%), but only 21 of 24 re-treated patients received a formal biopsy. No patients died from laryngeal cancer. DSS and OS were 100% and 92.3%, respectively. The mean VHI-10 scores were 19.3 preoperatively, 3.8 at 6-months postop, and 3.8 at 2-years postop. Smokers had a longer interval to re-treatment (P = .03), patients with T2 lesions had a shorter interval to re-treatment (0.02), and patients with T2 lesions presented with worse initial VHI-10 scores (0.002). CONCLUSIONS: A multi-institutional, retrospective case series of TLM-KTP ablation of EGC demonstrated excellent oncologic outcomes when close surveillance and proactive re-treatments were utilized. Disease-specific survival, overall survival, and vocal function were excellent. Additional studies are necessary to further analyze the merits and risks of this treatment approach.

Atypical Laryngeal Infections: Localized Lesions from Unusual Organisms May Simulate Malignancy.

OBJECTIVE: The identification of rare sources of laryngeal infection in immunocompetent patients. Recovered organisms were Mycobacterium tuberculosis (laryngeal tuberculosis [LTB]), Mycobacterium fortuitum (laryngeal Mycobacterium fortuitum [LMF]), and Blastomyces dermatiditis (laryngeal blastomycosis [LB]). METHOD: Single institution retrospective case series of three patients over a 2.5-year period and review of the literature on laryngeal infections by three atypical organisms. RESULTS: Three patients presented with hoarseness and cough; one additionally had throat pain (LTB). Indirect laryngoscopy demonstrated diffuse laryngeal ulceration (LTB, LMF) and an exophytic, contiguous glottic mass (LB). Direct microlaryngoscopic biopsies and cultures established the diagnoses, including a frozen section in one case (LB), which prevented a simultaneously planned surgical resection. Appropriate antimicrobial therapy yielded dramatic laryngeal and corresponding vocal improvement, for which we provide unique photo and audio documentation. In the last 10 years, fewer than 500 cases of LTB have been reported in the English language medical literature, principally outside the United States. To date, there have been reports of only 34 LB and no cases of LMF. CONCLUSION: Atypical infections of the larynx may be localized and mimic laryngeal cancer on endoscopy. Tissue examination as well as microbiologic samples are diagnostic and complementary.

Ideal Characteristics of a Laser-Protected Endotracheal Tube: ABEA and AHNS Member Survey and Biomechanical Testing.

OBJECTIVES: To determine the characteristics of laser-protected endotracheal tubes (LPETs) valued by otolaryngologists performing transoral laser surgery in the head and neck and to measure LPET stiffness. METHODS: An online questionnaire was completed by American Broncho-Esophagological Association (ABEA) and American Head and Neck Society (AHNS) members. LPET distal end compliance was measured in a biomechanics laboratory. RESULTS: A total of 228 out of 2109 combined ABEA and AHNS members completed the survey. The following LPET characteristics, which were properties of the Medtronic Laser-Shield II tube (MLST), were highly valued: softness and flexibility, surface smoothness, and a tight-to-shaft balloon (all P < .01). Prior to industry-driven discontinuation of the MLST, 52% of surgeons (78% of fellowship-trained laryngologists [FTLs]) reported using it; afterward, 58% reported using the stainless steel, Mallinckrodt Laser-Flex tube (MLFT). Forty-six percent of all respondents (69% of FTLs) did not consider cost being a factor in LPET choice. Biomechanical testing revealed the distal end of the MLST to be 3.45 times more compliant than the MLFT ( P < .01). CONCLUSION: Members of the ABEA and AHNS, particularly FTLs, highly value distinguishing properties of the now discontinued MLST. Manufacturers should consider this in the design of new LPETs.

Paradoxical Vocal Cord Motion in Pediatric Patients.

Paradoxical vocal cord motion (PVCM), also termed vocal cord dysfunction, is a poorly understood disorder of episodic dyspnea characterized by inappropriate vocal cord adduction during inspiration and potentially during expiration. It can coexist or be confused with asthma, so appropriate diagnosis is key to optimizing treatment success. Although many patients with PVCM may have underlying psychologic issues, there is emerging evidence to suggest that this entity is not psychogenic in every patient. Both laryngeal irritants and exercise have been identified as additional contributing factors in PVCM. Diagnosis of PVCM requires awake laryngoscopic confirmation. However, many patients do not exhibit signs of PVCM during this examination, despite provocation during testing. Therefore, clinical history remains key in determining which patients should proceed with behavioral therapy under the guidance of a speech pathologist. In addition, treatment may include limiting patient exposure to potential sources of laryngeal irritation. Refractory patients may benefit from psychologic assessment and treatment. [Pediatr Ann. 2016;45(5):e184-e188.].

Bedside Injection Medialization Laryngoplasty in Immediate Postoperative Patients.

OBJECTIVES: The morbidity of glottic insufficiency resulting from unilateral vocal fold immobility may significantly compromise postoperative recovery in patients with decreased pulmonary reserve or inability to protect their airway. Injection medialization laryngoplasty is an effective means of treating glottic insufficiency due to unilateral vocal fold immobility. The purpose of this study is to present our experience with bedside transoral injection medialization laryngoplasty in the immediate postoperative period. STUDY DESIGN: Case series with chart review. SETTING: Academic tertiary care hospital. SUBJECTS AND METHODS: Patient demographics, clinical characteristics, procedural details, and short-term outcome measures of oral intake were recorded in a cohort of 68 patients over 5 years with unilateral vocal cord paralysis who underwent injection medialization as a bedside procedure in the immediate postoperative period. RESULTS: Mean time to injection was 8.2 days postoperatively. At the time of injection, 40 of 68 patients were nil per os. Seventy percent (28 of 40) had their diet advanced to adequate oral intake within 5 days of injection. Greater than half of the injections (36 of 68) were performed in the intensive care unit. No complications were noted, and all patients in this cohort were able to tolerate the bedside injection. CONCLUSION: Bedside injection medialization laryngoplasty in the immediate postoperative period via the transoral approach can be performed in patients, even in the intensive care unit, while on anticoagulation, and may be of benefit for hospitalized patients with unilateral vocal fold immobility. Further studies quantifying improvement in voice and swallowing data are merited.

Effect of mandibular tori on glottic exposure during simulated suspension microlaryngoscopy.

OBJECTIVES: Mandibular tori have been identified as a contributing factor in difficult exposure during intubation. However, no investigation has measured the effect of mandibular tori on glottic exposure during suspension microlaryngoscopy (SML). The objective of this study was to measure how the size and location of mandibular tori affect glottic exposure during simulated SML at different thyromental distances. METHODS: Suspension microlaryngoscopy was modeled on an anatomically accurate skull and larynx with thyromental distances between 6 and 12 cm. Mandibular tori were simulated by protruding screws 5 to 15 mm from the lingual aspect of the mandible. The tori were positioned either 15 mm (anterior) or 25 mm (posterior) from the midline of the symphysis. The glottic exposure for the various-size tori in each location was measured by recording the displacement of the glottiscope tip relative to the most anterior exposure achievable without tori. The glottiscope angle relative to the horizontal plane was measured for each condition. RESULTS: Mandibular tori of more than 10 mm had a significant impact on glottic exposure. Displacement of the glottiscope tip ranged from 2 to 9 mm for anteriorly placed tori and from 7 to 29 mm for posteriorly placed tori, with larger tori causing greater displacement. Increasing the thyromental distance increased the posterior glottiscope tip displacement regardless of torus size or location. The glottiscope angle increased with larger tori (12º to 28º), but this angle did not change with increasing thyromental distance. CONCLUSIONS: Larger size and more-posterior location of mandibular tori more significantly reduce glottic exposure during SML. The inner table of the mandible is the most relevant anatomic constraint on glottic exposure, which varies with the presence or absence of mandibular tori independent of thyromental distance.

Salvage endoscopic angiolytic KTP laser treatment of early glottic cancer after failed radiotherapy.

OBJECTIVES: Management of early glottic cancer subsequent to failed radiotherapy is challenging, especially in balancing oncological control and function preservation. Patients frequently have been incentivized against surgical management and thus have undergone radiotherapy as initial treatment. This history compounds the difficulty of discussions about surgical management after recurrence. Typically, endoscopic salvage has less morbidity than transcervical partial laryngectomy and is clearly desirable over total laryngectomy. However, there are appropriate concerns about the efficacy of endoscopic salvage and the overarching impact on larynx preservation and survival. Given our success with endoscopic angiolytic KTP laser treatment of previously nonirradiated T1 and T2 glottic cancers, we examined our results from treating similar-sized lesions after failed radiotherapy. METHODS: We performed a retrospective chart review of 20 patients from our cancer database who had undergone failed radiation therapy elsewhere for early glottic cancer and then underwent endoscopic angiolytic KTP laser treatment. RESULTS: Analysis of the geographic tumor recurrence of the 20 patients revealed T1a N0 M0 cancer in 4 patients, T1b N0 M0 cancer in 1 patient, T2a N0 M0 cancer in 1 patient, and T2b N0 M0 cancer in 14 patients. After KTP laser salvage treatment, 4 patients (20%) had local recurrence (all T2b) and required subsequent total laryngectomy, and 3 of these patients (15%) ultimately died of disease. The remaining 16 patients (80%) were free of disease at least 2 years after endoscopic salvage (average follow-up, 39 months). CONCLUSIONS: Our investigation provides preliminary evidence that angiolytic KTP laser salvage treatment of early glottic cancer is an effective treatment after failed irradiation. Studies with larger cohorts and longer follow-up will be necessary to establish incontrovertible evidence of its efficacy.

Voice outcomes for photoangiolytic KTP laser treatment of early glottic cancer.

OBJECTIVES: Surgery and radiotherapy routinely provide high cure rates in treating early glottic cancer. Therefore, key metrics for success are optimal voice outcome and preservation of future cancer treatment options. Remarkably, there is a paucity of pretreatment versus posttreatment voice outcome data. Angiolytic KTP (potassium titanyl phosphate) laser treatment of early glottic cancer with ultranarrow margins was initiated to better preserve vocal function. Given that effective oncological results have been achieved, it was hypothesized that this approach would also result in improved posttreatment measures of vocal function that more closely approximate historical norms than pretreatment values. METHODS: Pretreatment and posttreatment voice outcome data were obtained for 92 patients (64 with T1 cancer and 28 with T2 cancer) who underwent 532-nm KTP laser treatment of early glottic cancer in a study design in which each patient essentially served as his or her own control. The evaluations included objective measures (acoustic and aerodynamic) and patients' self-assessments of vocal function (Voice-Related Quality of Life; V-RQOL). A series of mixed analyses of variance were conducted for all vocal function measures, with tumor stage and depth of invasion as the between-subjects variables and time (presurgery versus postsurgery) as the within-subject variable. RESULTS: There were statistically significant (p < or = 0.05) postoperative improvements for acoustic (perturbation and noise-to-harmonics ratio) and aerodynamic (subglottic pressure and vocal efficiency) measures of vocal function, as well as for V-RQOL assessment. CONCLUSIONS: Comprehensive pretreatment and posttreatment voice measures in a large patient cohort demonstrated that the KTP laser significantly improved postoperative vocal function in patients with early glottic cancer. Furthermore, radiotherapy was preserved as an oncological treatment option.

High-force simulated intubation fails to dislocate cricoarytenoid joint in ex vivo human larynges.

OBJECTIVES: We assessed the likelihood of arytenoid dislocation during intubation through the application of controlled force. METHODS: Six cadaveric human larynges were mounted in an apparatus for simulating forcible collision with the arytenoid complexes. An endotracheal tube tip probe (ETTP) was used to push one arytenoid complex, and a non-slip probe (NSP) was tested on the other. Increasing pressure was applied until the probes either slipped or reached 5 kg of force. Dissection was then performed to assess the integrity of the cricoarytenoid ligament. The forces obtained by pushing an endotracheal tube against an electronic balance were measured to estimate the maximal possible intubating force. RESULTS: None of the ETTP or NSP trials disrupted the cricoarytenoid joint ligaments, and the joint never appeared to be dislocated. The mean maximal forces were 1.8 kg for the ETTP (after which, slippage consistently occurred) and 4.7 kg for the NSP. The mean maximal forces from an endotracheal tube pushed against a scale were 1.5 kg (without stylet) and 4.6 kg (with stylet). CONCLUSIONS: Arytenoid dislocation did not happen, and gross disruption of the joint capsule or ligament did not occur, even when the testing approximated the maximum force achievable under extreme conditions. Endotracheal tube insertion thus seems unlikely to cause arytenoid dislocation.

Safety and dosing of bevacizumab (avastin) for the treatment of recurrent respiratory papillomatosis.

OBJECTIVES: Increasing evidence supports the use of laryngeal injections of the antiangiogenic agent bevacizumab (Avastin) for the adjuvant treatment of recurrent respiratory papillomatosis (RRP). A recent prospective open-label investigation, approved by the US Food and Drug Administration, employing 12.5 mg of sublesional bevacizumab demonstrated single-site efficacy without complications; however, the safety of multiple-site injections and higher dosing has not yet been reported. The primary objective of this study was to report on the safety of increased doses of bevacizumab for the treatment of RRP. METHODS: Two cohorts of adult patients were evaluated. In the first group, a prospective analysis was performed on patients with a diagnosis of laryngeal RRP after t heir participation in th e initial clinical trial with a single-site lowerdose (7.5 to 12.5 mg). They received higher doses of sublesional laryngeal bevacizumab (15 to 50 mg total) with detailed physiologic, hematologic, and serum chemistry measurements performed before and after each bevacizumab injection. A second cohort of patients received sublesional laryngeal injections of bevacizumab (15 to 88 mg total) without physiologic measurements and underwent a retrospective analysis of reported complications. RESULTS: One hundred consecutive laryngeal injection sessions (office, 87; operating room, 13) with bevacizumab were performed in 43 patients, with a mean dose of 30 mg total per treatment (range, 15 to 88 mg). Sixty-three of the 100 sessions were accompanied by KTP laser photoangiolysis of the papilloma prior to bevacizumab injections. Eighteen patients (cohort 1) underwent detailed physiologic assessment, and no dysfunction was observed. There were no local or systemic complications of bevacizumab administration. The second group of 25 patients (cohort 2) also reported no significant local or systemic complications. Neither patient group was observed to have a local wound problem in the larynx. CONCLUSIONS: This investigation provides evidence that higher doses of bevacizumab are relatively safe in adult patients with laryngeal RRP. Further refinements in pharmacologic concentration and drug delivery will determine the optimal treatment regimens in the future.

High-speed videoendoscopic analysis of relationships between cepstral-based acoustic measures and voice production mechanisms in patients undergoing phonomicrosurgery.

OBJECTIVES: There is increased interest in using cepstral-based acoustic measures for objective clinical voice assessment because of their apparent advantages over more time-honored methods, but there is a paucity of information about how these newer measures relate to underlying phonatory mechanisms. METHODS: We investigated the relationships between the acoustic cepstral peak magnitude (CPM) and high-speed videoendoscopy (HSV)-based measures of vocal fold phonatory function in 20 subjects who underwent phonomicrosurgery for vocal fold lesions. Acoustic and imaging data were acquired during sustained vowel phonation before and after surgery. RESULTS: The changes in the measures between presurgical and postsurgical assessments showed that the CPM correlated significantly with an HSV-based measure combining fundamental frequency deviation and average speed quotient (r = 0.70; p < 0.001) in a multiple linear regression, and that the variation in the CPM could also be attributed to trading relationships between the HSV-based measures of vibratory phase asymmetry and glottal closure. CONCLUSIONS: These initial results demonstrate that the clinical utility of cepstral-based measures can be enhanced by a better understanding of how these acoustic measures relate to underlying phonatory mechanisms. The CPM seems to integrate information about aperiodicity in vocal fold vibration, the relative speed of glottal closure, and estimates of glottal noise generation.