Prevalence and incidence of idiopathic subglottic stenosis in southern and central Alberta: a retrospective cohort study

Background

Subglottic stenosis (SGS) is a reportedly rare disease that causes recurrent severe airway obstruction. Etiologies reported for SGS include idiopathic, iatrogenic, autoimmune, congenital, and traumatic, with variable ratios among different centres. From empiric observation, southern and central Alberta was hypothesized to have a disproportionate distribution of SGS driven by increased idiopathic SGS (iSGS) compared to previous literature. Identification of causative agents of iSGS will help understand and guide future management options, so this study aimed to characterize the demographics of SGS subtypes, define prevalence and incidence rates of iSGS in southern Alberta, and geographically analyze for clustering of iSGS prevalence.

Methods

SGS patients from Alberta census divisions No. 1–9 and 15 were retrospectively reviewed. Patients were subtyped according to etiology of SGS and characterized. Idiopathic SGS prevalence and incidence was assessed; prevalence was further geographically segregated by census division and forward sortation area (FSA). Significant clustering patterns were assessed for using a Global Moran’s I analysis.

Results

From 2010 to 2019 we identified 250 SGS patients, who were substantially overrepresented by idiopathic patients (80.4%) compared to autoimmune (10.0%), iatrogenic (7.6%), congenital (1.2%), and traumatic (0.8%). The total iSGS prevalence was 9.28/100,000 with a mean annual incidence rate of 0.71/100,000 per year. Significant clustering was observed (Moran’s index 0.125; z-score 2.832; p = 0.0046) and the highest rates of prevalence were observed in southern Alberta and in rural communities heterogeneously dispersed around Calgary FSAs.

Conclusion

In southern and central Alberta, iSGS patients were disproportionately over-represented in contrast to other subtypes with the highest prevalence in southern Alberta. There was a three-fold higher annual incidence compared to previous literature demonstrating the highest rates of disease reported worldwide. Future research aims to expand the geographical scope and to assess for demographic or environmental differences within significant clusters that may contribute to disease pathophysiology.

Level of evidence

III.

Graphical Abstract

Retrospective review of dosing trends in botulinum toxin injections for the treatment of adductor spasmodic dysphonia in a long-term cohort

Background

Botulinum toxin A (BT) is the gold standard treatment for adductor spasmodic dysphonia (AdSD) with established use for greater than thirty years. The spasmodic dysphonia (SD) literature would benefit from additional long-term cohort data, especially in the Canadian population. The goals of this study were to evaluate whether BT dosage required to achieve acceptable voice shifts over time and to elucidate differences in the subgroups of patients receiving unilateral vocal fold (UVF) injections.

Methods

Patient records were retrospectively reviewed at the regional tertiary Voice Clinic for AdSD patients from 1996 to 2017 to identify AdSD patients treated with serial BT injections. Descriptive statistics, paired t-tests for time between treatments and ANOVA tests were used to evaluate trends in subgroup age.

Results

One-hundred and twenty-six patients (61% female, mean age = 53 ± 15.5 years) met inclusion criteria and received laryngeal EMG-guided BT injections for up to twenty-two years and as many as 79 treatments. The mean total BT dosage for our population was 1.54 ± 0.35 Units per side. The majority of subjects had decreasing doses over time with a small subgroup having slowly increasing doses. Comparing treatment dosages between unilateral and bilateral injection groups, injection dosage per vocal fold was 1.65 ± 0.62 with time between injections was significantly shorter for the unilateral injection group (mean = 105 days, SD ± 19.8 days, p = 0.005) compared to the bilateral injection subgroup (137 ± 35.7 days, p < 0.005). The mean age of the unilateral injection population as younger at 42.4 ± 11.8 years (p = 0.004).

Conclusion

The majority of patients in this study had decreasing BT injection dosages over time, with a smaller proportion having slowly increasing doses, thought to be likely relating to disease severity. The unilateral vocal fold injections were well tolerated despite needing more frequent injections, and found to be more prevalent in the younger age group.

Airway management changes associated with rising radiologic incidence of external laryngotracheal injury

BACKGROUND

Traumatic laryngeal injuries are uncommon life-threatening injuries that require prompt, rational management of a potentially precarious airway. It is unclear whether the current incidence of laryngotracheal injury is due to enhanced injury detection or increased occurrence. The objective of this study was to evaluate the relations between diagnostic imaging with both initial airway management and surgical treatment in patients with external laryngotracheal injuries (ELTIs) in Alberta.

METHODS

In this large-scale population-based analysis, we used regional health databases containing inpatient admissions, emergency department visits and trauma service activations employing International Classification of Diseases diagnostic codes to identify all ELTIs diagnosed from Apr. 1, 1995, to Dec. 31, 2011, in adults (age ≥ 16 yr). We evaluated health records and diagnostic imaging for injury features, airway management, operative interventions and hospital length of stay (LOS).

RESULTS

Eighty-nine patients met the inclusion criteria. The incidence of ELTIs increased over time, paralleling a rise in detection during the period incorporating greater computed tomography (CT) use (p = 0.002). Endotracheal tube intubation was performed in 8/30 cases (27%) in the pre-CT era, compared to 38/59 cases (64%) in the post-CT era (p = 0.001); the use of surgical intervention remained consistent. The largest contributors to increased endotracheal tube placements were the emergency department and emergency medical services. No change in survival was detected, but mean LOS among patients admitted for minor, isolated ELTIs increased by 2.3 (95% confidence interval 0.14-4.8) days (p = 0.06), mostly for patients admitted under critical care for mechanical ventilation.

CONCLUSION

Management of ELTIs shifted from predominantly conservative airway monitoring to endotracheal tube intubation over the study period in spite of no clinically significant change in injury severity or operative intervention frequency. The location of endotracheal tube placement suggests less comfort with ELTI among first-responder and emergency personnel.

An evaluation of in-office flexible fiber-optic biopsies for laryngopharyngeal lesions

Background

Operative endoscopy and flexible fiber-optic in-office tissue biopsy are common techniques to assess suspicious laryngopharyngeal lesions.

Methods

The primary outcome was the delay to the initiation of treatment. Secondary outcomes were delay to biopsy, histopathological diagnosis, and assessment at a multidisciplinary oncology clinic. A retrospective analysis was performed to assess the relative delays between these approaches to biopsy of laryngopharyngeal lesions.

Results

There were 114 patients in the study cohort; 44 in-office and 70 operative endoscopic biopsies). The mean delay from consultation to biopsy was 17.4 days for the operative endoscopy group and 1.3 days for the in-office group. The mean delay from initial otolaryngology consultation to initiation of treatment was 51.7 days and 44.6 days for the operative endoscopy and in-office groups, respectively.

Conclusion

In-office biopsy reduced the time from initial consultation to biopsy. The temporal gains via in-office biopsy did not translate into faster access to treatment. This outcome highlights the opportunity to improve access to treatment for patients with early diagnosis.

Clinical utility of PET/CT in the evaluation of head and neck squamous cell carcinoma with an unknown primary: a prospective clinical trial

BACKGROUND

Metastatic head and neck squamous cell carcinoma with an unknown primary is an uncommon but important problem. PET/CT, as an adjunct to diagnosis, is potentially useful but has never been studied in a prospective, single-blinded clinical trial.

METHODS

In all, 20 subjects with cervical metastases from an unknown head and neck primary were enrolled in a prospective clinical trial. A standard protocol was used in both clinic and operating room (OR). Study surgeons were blinded to the PET/CT result upon completion of the standard work-up.

RESULTS

PET/CT increased the detection of a primary site from 25% to 55% (5 vs 11 subjects). This difference was statistically and clinically significant (p = .03, McNemar's test). There was 1 false negative PET/CT scan.

CONCLUSIONS

An unknown primary should be diagnosed only after a complete head and neck examination, flexible endoscopy, and CT or MRI. PET/CT performed prior to panendoscopy will increase the diagnostic yield in the unknown head and neck primary population, leading to more targeted, and less morbid, treatment.

Acute group A streptococcal mastoiditis complicated by pneumocephaly in a previously healthy adult

Streptococcus pyogenes is a rare cause of mastoiditis in adults. We report a previously healthy adult patient who had acute bacteraemic S. pyogenes mastoiditis complicated by intra-cranial air. This novel report adds pneumocephaly to the currently recognized list of complications of acute mastoiditis.

Bedwetting and behavioural and/or emotional problems

OBJECTIVE

To assess the link between enuresis nocturna and the severity of behavioural and/or emotional problems in Dutch children and the course of these problems.

SETTING

West-Mine Region in the Netherlands.

SUBJECTS AND METHODS

Prospective cohort study involving 66 of the 80 bedwetting children from all 1652 children born in 1983 in this region. After 1 y, contact was still possible with 64 of the enuretics. We used the Dutch version of the Child Behaviour Checklist (CBCL) and a questionnaire about bedwetting.

RESULTS

The mean T-score for Total Problems (CBCL score) in 1992 (M1; mean age 8.6) was 52.1, and 1 y later was 49.2 (M2). There was no significant difference in the CBCL scores for M1, M2 and a matching group from the Dutch CBCL norm population, either in the group who remained wet or in the group who became dry. There were no differences between the sexes. There was no link between the severity of behavioural and emotional problems and the frequency of bedwetting. However, more children with bedwetting than expected were in the clinical range.

CONCLUSION

There was no difference in behavioural and/or emotional problems between the first and the second measurement and the matching group from the CBCL norm group. There were no differences in behavioural and/or emotional problems between primary and secondary bedwetters, nor were there any consequences related to the frequency of bedwetting.

Personality development of adolescents with hypogonadotropic hypogonadism

Hypogonadotropic hypogonadism is a disorder of puberty characterized by absence of spontaneous sexual maturation. 8 male adolescents with this disorder, who were treated with pulsatile GnRH administration, were examined psychologically by means of standardized interviews. Problems were found in the development of independence (specifically relating to own body image and social functioning) and in identity development (particularly on personal characteristics).

[Behavior characteristics of 10-year-old ex-neonatal intensive care patients]

Subject of study was the analysis of behavioral characteristics of 51 10-year-old ex-NICU patients at home and at school. Parental assessment of child behavior proved not to differ from the normative data. Teachers however reported more problematic behaviors, particularly with regard to the introverted behavior in boys. On the basis of these findings one can conclude that the prognosis for this patient group is better than expected. A plea is made for future research to focus on factors that will facilitate a more favorable behavior development.

[The psychosocial development of boys treated with pulsatile LHRH administration for hypogonadotropic hypogonadism]

Eight male adolescents with hypogonadotropic hypogonadism, who were being treated with pulsatile GnRH administration, were examined psychologically. We focused on the development of independence and on the manner in which they experienced their illness and treatment. The patient group was compared with a group of male adolescents of normal height and a group of male adolescents of short stature. We found that there were problems in the patient group in the development of independence, specifically relating to their own body image and social functioning. The retarded sexual development of these patients is probably of greater importance than the height growth-related problems, if any. The problems we found appeared to be caused primarily by the presence of the physical disorder and not by the stress of treatment.

[Medico-psychological treatment of retentive encopresis]

A 'behavioral pediatric' approach applied to the treatment of children with chronic retentive encopresis is reported. The treatment program, based on behavioral psychological principles, in which the parents participate, is found to be highly effective in eliminating the problem of encopresis. However, it will be shown through casuistry that general psychological functioning in children can affect the course of the therapeutic process. Both 'somatic' attitudes and psychological obstacles need to be taken into account. Unbiased diagnostics and more differentiated therapeutic indications are necessary conditions for a favourable outcome of treatment.

The malignant lymphoepithelial lesion of the salivary glands

Malignant lymphoepithelial lesion (MLEL) is a rare neoplasm of the salivary gland which has an exceptionally high incidence in the Eskimo. Eighty-four cases have been previously reported. Seven additional cases in six Eskimos and one Filipino patient are reported in this paper. The etiology, treatment and prognosis of these lesions is then discussed.

Home care of the pediatric tracheostomy: our experience

Sixteen children with indwelling tracheostomy tubes or Montgomery T-tubes were cared for at home under the supervision of the Respiratory Home Care Program. The infants and children ranged in age from five months to 15 years and required tracheostomy for various forms of pathology. There was one unexpected death at home, but it did not appear to be caused by tracheostomy tube problems. We believe that home tracheostomy care in the pediatric patient is safe and is a great benefit to the wellbeing of the patient.