Partial arytenoidectomy with transoral vocal fold lateralisation in treating airway obstruction secondary to bilateral vocal fold immobility

OBJECTIVE

To report the outcome of 18 patients with a tracheostomy secondary to bilateral vocal fold immobility, who were managed using reconstructive transoral laser microsurgical techniques.

METHODS

A retrospective review was conducted of the surgical outcome of 18 patients with bilateral vocal fold immobility and a tracheostomy resulting from different aetiologies. Follow-up duration ranged from one to five years.

RESULTS

A total of 18 patients had a tracheostomy at presentation because of bilateral true vocal fold immobility and stridor. All cases were treated using reconstructive transoral laser microsurgery with arytenoidectomy and vocal fold lateralisation. All patients were successfully decannulated by eight weeks after surgery.

CONCLUSION

Reconstructive transoral laser microsurgery using partial arytenoidectomy with vocal fold lateralisation is minimally invasive, feasible, safe and effective for airway reconstruction in patients who present with stridor due to bilateral true vocal fold immobility.

Brain-Mimicking Phantom for Photoablation and Visualization

While the use of tissue-mimicking (TM) phantoms has been ubiquitous in surgical robotics, the translation of technology from laboratory experiments to equivalent intraoperative tissue conditions has been a challenge. The increasing use of lasers for surgical tumor resection has introduced the need to develop a modular, low-cost, functionally relevant TM phantom to model the complex laser-tissue interaction. In this paper, a TM phantom with mechanically and thermally similar properties as human brain tissue suited for photoablation studies and subsequent visualization is developed. The proposed study demonstrates the tuned phantom response to laser ablation for fixed laser power, time, and angle. Additionally, the ablated crater profile is visualized using optical coherence tomography (OCT), enabling high-resolution surface profile generation.

Arytenoid granuloma: a single-institution experience of management of 62 cases

OBJECTIVE

This retrospective study was undertaken to assess the outcome of the medical and/or surgical management of patients presenting with clinical features of arytenoid granuloma.

METHODS

The records of 53 males and 9 females were reviewed for predisposing factors, types of treatment received and recurrence following the treatment.

RESULTS

Most of the patients (48 out of 62, 77.4 per cent) were treated conservatively with medical management and voice therapy, which resulted in complete resolution of arytenoid granuloma in over two-thirds of the patients treated (32 out of 48, 66.6 per cent). Overall, 28 patients (out of 62, 45.1 per cent) required surgery (14 failed medical treatment cases and 14 surgery as first-line treatment cases). Of these, five patients (out of 28, 17.9 per cent) had recurrence, and were managed with revision surgery and concurrent local injection of Botox.

CONCLUSION

Anti-reflux medication and voice therapy are effective first-line management options. Pre- and post-surgery adjuvant treatment improves the results of surgery. Local injection of Botox was successful in the treatment of failed surgical cases.

On the Merits of Using Angled Fiber Tips in Office-based Laser Surgery of the Vocal Folds

Office-based endoscopic laser surgery is an increasingly popular option for the treatment of many benign and pre-malignant tumors of the vocal folds. While these procedures have been shown to be generally safe and effective, recent clinical studies have revealed that there are a number of challenging locations inside the larynx where laser light cannot be easily delivered due to line-of-sight limitations. In this paper, we explore whether these challenges can be overcome through the use of side-firing laser fibers. Our study is conducted in simulation, using three-dimensional models of the human larynx generated from X-ray microtomography scans. Using computer graphics techniques (ray-casting), we simulate the application of laser pulses with different types of laser fibers and compare the total anatomical coverage attained by each fiber. We consider four fiber types: a traditional "forward-looking" fiber - not unlike the ones currently used in clinical practice - and three side-firing fibers that emit light at an angle of 45, 70, and 90 degrees, respectively. Results show that side-firing fibers enable a ~70% increase in accessible anatomy compared to forward-looking fibers.

Perceptual and Acoustic Outcomes of Early-Stage Glottic Cancer After Laser Surgery or Radiotherapy: A Meta-Analysis

Laser surgery (LS) or radiotherapy (RT) is normally recommended in early glottic cancer. The objective of this study was to perform a comprehensive meta-analysis of acoustic and perceptual outcomes to compare voice quality of LS or RT in early-stage glottic cancer. Data sources were obtained after searching PubMed, Google Scholar, EBSCO, and RISS using the following search terms: glottic cancer, glottic carcinoma, endoscopic surgery, laser surgery, radiotherapy, radiation, voice, voice quality, and grade, roughness, breathiness, asthenia, and strain (GRBAS) scale. Articles that compared voice outcomes between LS and RT were identified. This meta-analysis included 15 articles with 744 patients, including 400 in the LS group and 344 in the RT group. Random effects models were selected. Forest plots included standardized mean differences, standard errors, variance, 95% confidence intervals (lower limit to upper limit), z-values, and P-values. In perceptual analysis, grade (G) and asthenia (A) of RT were significantly better than LS. There was no statistically significant difference in roughness (R), breath (B), or strain (S) between LS and RT groups. Jitter, shimmer, and noise to harmonic ratio measurements showed significant differences, resulting in enhanced posttreatment effect of RT compared to LS. Results of our meta-analysis suggested that RT might lead to superior voice quality than LS in early glottic cancer.

Periodontal Bone Regeneration and the Er,Cr:YSGG Laser: A Case Report

BACKGROUND

Traditional methods of regenerating bone in periodontal bone defects have been partially successful and have involved numerous protocols and materials. More recently, it has been proposed that Er,Cr:YSGG laser energy may also be beneficial in the treatment of periodontal pockets, particularly in the regeneration of bone lost due to periodontal disease.

CASE DESCRIPTION

The purpose of this paper is to present a case report of the Er,Cr:YSGG laser being used to conservatively treat a recalcitrant periodontal pocket in the presence of a periodontal bone defect and that resulted in successful resolution of the pocket and significant radiographic bone fill at the 1 year recall visit.

CLINICAL IMPLICATIONS

This protocol using the Er,Cr:YSGG laser for the treatment of periodontal loss of attachment and periodontal bone loss may represent a less invasive alternative than traditional open-flap periodontal surgery or the intrasulcular use of other more penetrating laser wavelengths.

Efficacy and safety of selective laser trabeculoplasty as a primary procedure for controlling intraocular pressure in primary open angle glaucoma and ocular hypertensive patients

OBJECTIVE

Assessment of the potential efficacy and safety of selective laser trabeculoplasty (SLT) as a primary therapeutic modality for lowering the intraocular pressure (IOP) in high tension open angle glaucoma (OAG) and ocular hypertensive patients (OHT).

METHODS

Twenty five patients (35 eyes) were enrolled in this prospective interventional longitudinal clinical study, undertaken during the period January 2005 to October 2006. All the laser procedures were done in the Oyoon Eye Center in Cairo, Egypt. Informed consent was taken from the patients after explanation of the procedure. Eighteen patients (25 eyes) had mild to moderate high tension open angle glaucoma, and there were 7 ocular hypertensive patients (10 eyes). Participants underwent selective laser trabeculoplasty (SLT) 180 degrees and followed up over a period of 12 months to assess the intraocular pressure lowering effect after SLT. Possible complications of the procedure were reported.

RESULTS

The intraocular pressure (mean ± standard deviation [StDev]) decreased from baseline pre-operative value of 26.78±3.13 mm Hg to 19.34±1.89 mm Hg 12 months after SLT (p<0.001). The average reduction in intraocular pressure (IOP) was 7.44 mm Hg (95% confidence interval 6.45 - 8.41 mm Hg). By the end of the follow up period (12 months), 62.9% of cases (22 eyes) showed IOP decrease by ≥ 30% from the baseline value, and 77.1% of cases (27 eyes) showed IOP decrease by ≥ 25% of baseline IOP.

CONCLUSION

Selective laser trabeculoplasty is an effective IOP lowering modality. It can be used as a primary treatment for open angle glaucoma and ocular hypertensive patients. If the minimal side effects reported are considered, it can be concluded that SLT has a potential safety to be used as primary alternative treatment for open angle glaucoma and ocular hypertensive patients.