Strengthening oropharyngeal muscles as an approach to treat post-stroke obstructive sleep apnea: A feasibility randomised controlled trial.

This study aimed to determine the feasibility of a randomised controlled trial (RCT) evaluating oropharyngeal exercise (OPE) intervention as an alternative therapy for obstructive sleep apnea (OSA) in patients with stroke or transient ischaemic attack (TIA). Despite the high prevalence of OSA in this population, the standard therapy, continuous positive airway pressure (CPAP), is often poorly tolerated. Thirty stroke/TIA patients with OSA unable to tolerate CPAP were randomly assigned to an oropharyngeal exercise or sham exercise protocol. They performed exercises for 6 weeks, 5 days per week, 30 minutes twice per day. Feasibility was ascertained by the proportion of enrolled patients who completed more than 80% of the OPE regimen. Isometric tongue pressures, apnea-hypopnea index (AHI), oxygen desaturation index (ODI), daytime sleepiness, and quality of life (QOL) outcomes were collected at baseline, post-training (6-week follow-up), and retention (10-week follow-up) to document preliminary efficacy. Adherence to study exercises was excellent, with 83% of participants completing more than 80% of the exercises. The isometric tongue pressures were observed to improve in the oropharyngeal exercise group (compared with the sham group), along with a decrease in OSA severity (measured by the AHI and ODI), reduced daytime sleepiness, and enhanced quality of life outcomes following the exercise programme. Only the effects on posterior isometric tongue pressure and daytime sleepiness remained significantly different between groups at the retention session. In conclusion, an RCT evaluating the efficacy of oropharyngeal exercises on post-stroke/TIA OSA is feasible and our preliminary results suggest a clinically meaningful effect.

Sex Differences in Obstructive Sleep Apnea after Stroke.

BACKGROUND AND OBJECTIVES: Obstructive sleep apnea (OSA) is prevalent after stroke and associated with recurrent stroke, prolonged hospitalization, and decreased functional recovery. Sex differences in post-stroke OSA remain underexplored. The objective of this study was to evaluate sex differences in functional outcomes, stroke and OSA severity, and clinical manifestations of OSA in stroke patients with OSA. METHODS: We retrospectively evaluated data from three previously conducted studies. Study patients had an imaging-confirmed stroke and had been found to have OSA (apnea-hypopnea index [AHI] ≥ 5) on either in-laboratory polysomnography or home sleep apnea testing performed within 1 year of their stroke. Linear regression models were used to evaluate study outcomes. RESULTS: In total, 171 participants with post-stroke OSA (117 males [68.4%] and 54 females [31.6%]) were included. Female sex was an independent predictor for greater functional impairment (ß = 0.37, 95% CI 0.029-0.71, p = 0.03), increased stroke severity (ß = 1.009, 95% CI 0.032-1.99, p = 0.04), and greater post-stroke depressive symptoms (ß = 3.73, 95% CI 0.16-7.29, p = 0.04). Female sex was associated with lower OSA severity, as measured by the AHI (ß = -5.93, 95% CI -11.21- -0.66). Sex was not an independent predictor of specific symptoms of OSA such as daytime sleepiness, snoring, tiredness, and observed apneas. CONCLUSION: Females with post-stroke OSA had poorer functional outcomes and more severe strokes compared to males, despite having lower OSA severity. Females with post-stroke OSA also exhibited more depressive symptoms. Understanding sex differences in patients with post-stroke OSA will likely facilitate better recognition of OSA and potentially improve clinical outcomes.

Obstructive sleep apnea is associated with markers of cerebral small vessel disease in a dose-response manner: A systematic review and meta-analysis.

Cerebral small vessel disease manifests on neuroimaging as white matter hyperintensities, lacunes, cerebral microbleeds, perivascular spaces or subcortical infarcts and is a major contributor to dementia, stroke and incident death. We aimed to determine whether obstructive sleep apnea severity is associated cerebral small vessel disease. A systematic search was conducted for studies examining the association between obstructive sleep apnea and cerebral small vessel disease markers. A random-effects model was used to meta-analyze unadjusted odds ratios derived from event rates. The neuroimaging-derived measures of white matter hyperintensities, lacunes, and cerebral microbleeds were compared against increasing obstructive sleep apnea severity, as measured by apnea-hypopnea indices of <5, 5-15, ≥15 and ≥ 30. Thirty-two observational studies were included: ten reported effect sizes for white matter hyperintensities, nine for lacunes and three for cerebral microbleeds. Compared to patients without obstructive sleep apnea, the odds of possessing white matter hyperintensities were 1.7 [95% confidence interval 0.9-3.6] in mild, 3.9 [2.7-5.5] in moderate-severe and 4.3 [1.9-9.6] in severe obstructive sleep apnea. Moderate-severe obstructive sleep apnea was associated with a higher risk of lacunar infarcts. Obstructive sleep apnea had no association with cerebral microbleeds and an indeterminate association with perivascular spaces and subcortical infarcts due to insufficient data.

Using Standardized Tools to Characterize Adult Day Program Populations: Implications for Future Research and Clinical Practice.

OBJECTIVES: To demonstrate the usefulness of primary data collection using clinician-rated and self-rated standardized measures to describe adult day program (ADP) populations and address programming issues such as identifying members at risk of dropping out. SETTING AND PARTICIPANTS: One ADP in London, Ontario, and 2 ADPs in Toronto, Ontario, Canada. A total of 223 community-dwelling older adults were recruited across the 3 different programs. METHODS: The interRAI Community Health or Home Care Assessment and self-rated psychosocial assessments were collected on program enrollment. Data analyses included descriptive statistics, comparison of the populations between ADPs, and multinomial regression models to assess reasons for program withdrawal. RESULTS: Mean ages across the 3 programs ranged from 78.3 to 83.8 years and the proportion of women ranged from 49.3% to 56.6%. Compared with one of the ADPs, members from 2 other ADPs exhibited higher use of mobility aids (P < .001), higher levels of cognitive impairment (P < .05), increased risk for institutionalization (P < .001), lower levels of depression (P < .01), and greater need for supervision for basic and instrumental activities of daily living (P < .01). Members assessed to be at higher risk for institutionalization and have increased medical complexity showed possible association with program withdrawal at one ADP. CONCLUSIONS AND IMPLICATIONS: The tools were useful in identifying differences in physical and psychosocial characteristics of members across the 3 ADPs. Information collected from interRAI and self-rated psychosocial assessments may be helpful in the development of individualized care plans, program services, and recommendations that target transitional care. By understanding member profiles and reasons for withdrawal, ADPs may be able to develop strategies to help members stay in the program and live in the community longer.

Trials in Sleep Apnea and Stroke: Learning From the Past to Direct Future Approaches.

Few randomized controlled trials have evaluated the effectiveness of continuous positive airway pressure (CPAP) in reducing recurrent vascular events and mortality in poststroke obstructive sleep apnea (OSA). To date, results have been mixed, most studies were underpowered and definitive conclusions are not available. Using lessons learned from prior negative trials in stroke, we reappraise prior randomized controlled trials that examined the use of CPAP in treating poststroke OSA and propose the following considerations: (1) Intervention-based changes, such as ensuring that patients are using CPAP for at least 4 hours per night (eg, through use of improvements in CPAP technology that make it easier for patients to use), as well as considering alternative treatment strategies for poststroke OSA; (2) Population-based changes (ie, including stroke patients with severe and symptomatic OSA and CPAP noncompliers); and (3) Changes to timing of intervention and follow-up (ie, early initiation of CPAP therapy within the first 48 hours of stroke and long-term follow-up calculated in accordance with sample size to ensure adequate power). Given the burden of vascular morbidity and mortality in stroke patients with OSA, there is a strong need to learn from past negative trials and explore innovative stroke prevention strategies to improve stroke-free survival.

Evaluating Patients' Perception of the Risk of Acute Care Visits During Systemic Therapy for Cancer.

PURPOSE: Unplanned emergency department (ED) visits and hospitalizations are common during systemic cancer therapy. To determine how patients with cancer trade off treatment benefit with risk of experiencing an ED visit or hospitalization when deciding about systemic therapy, we undertook a discrete choice experiment. MATERIALS AND METHODS: Patients with breast, colorectal, or head and neck cancer contemplating, receiving, or having previously received systemic therapy were presented with 10 choice tasks (5 in the curative and 5 in the palliative setting) that varied on 3 attributes: benefit, risk of ED visit, and risk of hospitalization. Preferences for attributes and levels were measured using part-worth utilities, estimated using hierarchical Bayes analysis. Segmentation analysis was conducted to identify subgroups with different preferences. RESULTS: A total of 293 patients completed the survey; most were female (76%), had breast cancer (63%), and were currently receiving systemic therapy (72%) with curative intent (59%). Benefit was the most important decision attribute regardless of treatment intent, followed by risk of hospitalization, then risk of ED visit. Two segments were observed: one large cluster exhibiting logical and consistent choices, and a smaller segment exhibiting illogical and inconsistent choices. Patients in the latter segment were more likely to have metastatic head and neck cancer, be male, were older, and reported fewer prior ED visits. CONCLUSION: Although the risk of ED visit or hospitalization contributes to patient treatment preferences, benefit was the most important attribute. Segmentation suggests that a subset of patients may lack cognitive abilities, engagement, or literacy to consistently evaluate treatment choices. Understanding this subset may provide insight into patients' decision making and understanding of treatment options.

Embolic Stroke of Undetermined Source and Sleep Disorders.

Background and Purpose- Compared with other causes of ischemic stroke, the mechanism of action of embolic stroke of undetermined source (ESUS) remains unclear, with previous literature suggesting that ESUS may be due to an undetected cardioembolic source. This study aimed to improve our understanding of the pathophysiology of ESUS through current knowledge of sleep disorders. Methods- Patients were included in this study if they sustained an ischemic stroke and completed either polysomnography or a home sleep apnea test. Strokes were classified into 1 of 6 mechanisms and were compared with the presence of sleep disorders (ie, obstructive sleep apnea, periodic limb movements, and abnormalities in sleep architecture). Results- There was a significant relationship between obstructive sleep apnea and cardioembolic stroke mechanism compared with the other stroke mechanisms (P=0.018). There was no significant relationship between obstructive sleep apnea and ESUS (P=0.585). Patients with ESUS were significantly more likely to have an elevated periodic limb movement index (P=0.037) and prolonged sleep onset latency (P=0.0166) compared with patients with other causes of stroke. Conclusions- ESUS was not associated with markers of cardioembolic stroke such as obstructive sleep apnea. There was a significant relationship between ESUS and elevated periodic limb movements and impaired sleep architecture, which suggests that ESUS may have a multifactorial underlying pathophysiology.

Educating Stroke/TIA Patients about Obstructive Sleep Apnea after Stroke: A Randomized Feasibility Study.

BACKGROUND: Obstructive sleep apnea (OSA) occurs in about 70% of stroke and transient ischemic attack (TIA) patients and is associated with poor function and recurrent vascular events. Continuous Positive Airway Pressure (CPAP) has been shown to improve poststroke/TIA outcomes but adherence is generally poor. This study aimed to develop and conduct a preliminary assessment of educational materials for poststroke/TIA OSA. METHODS: This blinded pilot study involved the randomization of stroke/TIA patients to either an intervention group (who viewed an educational pamphlet and slideshow) or a control group (standard of care). Patient ratings were used to evaluate the educational materials. Changes in knowledge, daytime sleepiness, functional outcomes of sleep, and CPAP use were assessed at baseline and 6 months. RESULTS: Total 93% of eligible patients consented to participate. Forty-eight participants were randomized to the control group (n = 23) or intervention group (n = 25). In the intervention group, all patients agreed or strongly agreed that the information in the educational materials was useful and that the wording was easy to understand. There were no significant changes in knowledge, daytime sleepiness, and functional outcomes of sleep between both groups at 6 months. In those who used CPAP, there was no significant difference in mean hours of CPAP use at the 6-month follow-up. CONCLUSIONS: The educational program was feasible and easy to understand amongst stroke/TIA patients but did not lead to a significant change in outcomes or CPAP use. The lessons learned can be used to facilitate future development of educational materials and plan an adequately-powered trial.

Quality improvement: an assessment of participation and attitudes of medical oncologists.

PURPOSE: Although quality improvement (QI) is an integral part of cancer care, there are few QI publications in the medical oncology literature. We examined the prevailing attitudes of medical oncologists toward QI and causes for the low QI publication rate in the medical oncology literature. METHODS: Using a modified Dillman method, we distributed a 13-question online survey to medical oncologists across Canada asking about their attitudes toward and involvement in QI and perceived barriers to publishing QI studies. RESULTS: We attained a 43% response rate (143 of 332). Of the responding oncologists, 97% (138) agreed that QI was an important aspect of their practice, although only 49% (70) had participated in QI in the past 5 years. Physicians with administrative responsibility were more likely than clinicians to be involved in QI (P = .008). Most QI participants focused on domains of safety (70%) and patient centeredness (67%). Among QI participants, 72% did not publish their findings, because of lack of time (34%), no identifiable journals (14%), and unfamiliarity with QI methodology (10%). Barriers for QI nonparticipants included uncertainty about how to get involved (45%), lack of time (18%), and limited institutional support or recognition (18%). QI participants had greater awareness of recent practice-changing QI publications compared with nonparticipants (P = .003). CONCLUSION: Canadian medical oncologists face limitations to participating in and publishing QI initiatives because of lack of knowledge about ongoing initiatives, lack of time, and lack of resources to aid publication. Improving networking opportunities and prioritizing QI at the institutional level can address this need.