Vocal fold fixation due to proximal stenosis progression complicating idiopathic subglottic stenosis.

PURPOSE: This study examined the incidence and risk factors for vocal fold fixation due to proximal progression of idiopathic subglottic stenosis (ISS) over the course of serial treatments. METHODS: Records of 22 consecutive patients with ISS treated between 2004 and 2016 were retrospectively reviewed. Patient, stenosis, and treatment details were recorded. Cox regression was used to identify independent predictors of vocal fold fixation. RESULTS: All patients were female and mean age at diagnosis was 46 ± 7 years. In five patients, the stenosis was within 15 mm of the glottis at first treatment. Vocal fold fixation due to proximal stenosis progression occurred in seven (32%) patients. It led to permanent hoarseness due to unilateral vocal fold fixation in two patients and caused airway compromise due to bilateral vocal fixation in two other patients. No airway-related deaths occurred and no patient required a tracheostomy. Stenosis incision using coblation or potassium titanyl phosphate laser, and an initial glottis-to-stenosis (GtS) distance < 15 mm significantly increased the risk of proximal stenosis progression on univariable analysis. CONCLUSION: Vocal fold fixation due to proximal stenosis progression is a significant complication of idiopathic subglottic stenosis and causes permanent voice and/or airway sequelae. It should be actively looked for and documented every time a patient is assessed. If a reduction in the GtS distance is observed, definitive surgery should be promptly considered before proximal stenosis progression compromises the efficacy and safety of definitive treatment or, worse, causes vocal fold fixation.

Laryngeal epithelial thickness: a comparison between optical coherence tomography and histology.

OBJECTIVES: Optical coherence tomography, an imaging modality using near-infrared light, produces cross-sectional tissue images with a lateral pixel resolution of 10 microm. However, normative data is first needed on epithelial thickness for lesion characterisation, and, to date, little exists. The purpose of our study is to measure normal laryngeal epithelial thickness by in vivo optical coherence tomography, and compare these values to those obtained from fixed ex-vivo laryngectomy specimens. DESIGN AND SETTING: Prospective at a single medical center in California, United States. PARTICIPANTS: A total of 116 patients undergoing operative endoscopy. MAIN OUTCOME MEASURES: Optical coherence tomography images of clinically normal laryngeal subsites were selected. Calibrated measurements of epithelial thickness at various laryngeal subsites were recorded. Measurements of epithelial thickness from corresponding areas were obtained using optical micrometry on histologically normal regions of 15 total laryngectomy specimens. Descriptive statistics were performed. RESULTS: Mean epithelial optical coherence tomography thicknesses were: true vocal cords (81 microm), false vocal cords (78 microm), subglottis (61 microm), aryepiglottic folds (111 microm), laryngeal epiglottis (116 microm) and lingual epiglottis (170 microm). Epithelial thicknesses in fixed tissues were: true vocal cords (103 microm), false vocal cords (79 microm), aryepiglottic folds (205 microm) subglottis (61 microm), laryngeal epiglottis (38 microm) and lingual epiglottis (130 microm). CONCLUSIONS: Optical coherence tomography does not have the artifacts associated with conventional histologic techniques. The inevitable development of office-based optical coherence tomography devices will increase the precision of laryngeal measurements and contribute to the clinical application of this technology in diagnosing laryngeal disease.

Early laparoscopic biliary injury: experience in New Zealand.

Data on the incidence, nature and management of early laparoscopic biliary injury up to January 1993 were obtained by a postal questionnaire sent to all New Zealand general surgeons (n = 214; response rate 71 percent) and to all endoscopists who perform endoscopic retrograde cholangiography (n = 16; response rate 100 percent). A total of 41 injuries (surgeons' survey, 22; endoscopists' survey, 19) occurred in an estimated 4000 laparoscopic cholecystectomies; 16 involved the common bile and hepatic ducts, and 25 the cystic and segment V ducts. Operative cholangiography was performed in one patient. The diagnosis of injury was made after operation in 31 of 41 patients and after discharge in 21. Conservative management was undertaken in only 19 patients. This prospective audit documents an increase in the incidence of early biliary injury after the introduction of laparoscopic cholecystectomy in New Zealand. The results highlight the need for further study to determine the best way to ensure early and accurate diagnosis of biliary injury and to define optimal conservative and operative management.

Early experience with minimally invasive surgery: a New Zealand audit.

The clinical and economic impact of minimally invasive surgery in New Zealand, especially laparoscopic cholecystectomy, has been profound but uncharted. A postal questionnaire was sent to all general surgeons in New Zealand (n = 214), in order to document the current levels of experience, adequacy of training, levels of equipment and sources of funding. In the case of laparoscopic cholecystectomy, further details were obtained relating to operative technique, complication rates and approaches to the management of choledocholithiasis. The response rate was 71%. From 27 centres, 71 of 106 active general surgeons were performing minimally invasive surgery. Of the 34 different procedures audited, cholecystectomy (3056), herniorrhaphy (178), and appendicectomy (141) were performed most often. Primary funding came from Area Health Boards (71%) and private hospital funds (25%) with 4% coming from other sources. Ten different camera/insufflator systems were used. Training was perceived to be adequate by the majority of surgeons (89%), although seven surgeons had received no specific training. Laparoscopic cholecystectomy technique included: prophylactic antibiotics (89% of surgeons), patients supine (80%), wound infiltration (80%), routine use of diathermy within triangle of Calot (36%) and a routine peritoneal drain (13%). Routine operative cholangiography was used rarely (7%) and 72% of surgeons had deliberately changed their policy with respect to its use. Twenty-two cases of laparoscopic biliary injury were identified by the survey, none of whom had operative cholangiography. The conversion rate was 13% for acute and 4% for elective laparoscopic cholecystectomy. This survey indicated the broad scope of minimally invasive surgery that is being undertaken, and highlights potentially important variations in surgical practice.