Tuesday, December 5, 2023
Physicians - maximum of 0.25 AMA PRA Category 1 Credit(s)™
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This activity is intended for neurologists, family medicine/primary care clinicians, internists, public health and prevention officials, nurses, nurse practitioners, pharmacists, physician assistants, and other members of the healthcare team for patients with sleep disorders who may be at increased risk for stroke.
The goal of this activity is for members of the healthcare team to be better able to describe the association between a spectrum of sleep disturbance symptoms and risk for acute stroke in an international setting, according to the INTERSTROKE international case control study of patients presenting with first acute stroke and control participants matched by age and sex.
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CME / ABIM MOC / CE Released: 5/12/2023
Valid for credit through: 5/12/2024, 11:59 PM EST
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Good health requires adequate sleep. Impaired sleep may include mild deviations in duration; impairments in quality, initiation, maintenance; associated symptoms; and complex syndromes.
Most previous studies have incompletely measured all relevant sleep domains, hindering complete assessment of their independent contribution. Certain symptoms, including nocturnal awakening and snorting, are incompletely studied as potential independent risk factors.
Disordered sleep is associated with a significantly increased risk for stroke, new research shows.
Results of a large international study show stroke risk was more than 3 times higher in persons who slept too little, more than twice as high in persons who sleep too much, and 2 to 3 times higher in persons with symptoms of severe obstructive sleep apnea (OSA).
The study also showed the greater the number of sleep disorder symptoms, the greater the stroke risk. The 11% of study participants with 5 or more symptoms of disordered sleep had a 5-fold increased risk for stroke.
Although the study data do not show a causal link between disordered sleep and stroke, the association between the two was strong.
"Given the association, sleep disturbance may represent a marker of somebody at increased risk of stroke and further interventional studies are required to see if management can reduce this risk," lead investigator Christine Mc Carthy, MD, PhD, a geriatric and stroke medicine physician and researcher with the University of Galway, Galway, Ireland, told Medscape Medical News. "In the interim, however, management of sleep disturbance may have a positive impact on a patient's quality of life."
The findings were published online April 5 in the journal Neurology.[1]
More Symptoms, More RiskPrevious research shows severe OSA doubles the risk for stroke and increases the chance of recurrent stroke. A 2019 study showed people with insomnia had a small increased risk of stroke[2].
"Both snoring and extremes of sleep duration have been previously associated with an increased risk of stroke in observational research, but less is known about other symptoms of sleep impairment, with less consistent findings," Mc Carthy said.
Prior studies also have come from a single geographic region, which Mc Carthy noted could limit their generalizability.
For this effort, investigators used data from 4496 participants in INTERSTROKE, an international case-control study of risk factors for a first acute stroke. About half of the participants had a history of stroke.
Using information collected from a survey of sleep habits, researchers found an elevated stroke risk in persons who received fewer than 5 hours of sleep per night (odds ratio [OR] 3.15 [95% CI:, 2.09, 4.76]) or more than 9 hours of sleep per night (OR 2.67 [95% CI: 1.89, 3.78]) compared with persons who slept 7 hours per night.
Participants who took unplanned naps or naps lasting an hour or more (OR 2.46 [95% CI: 1.69, 3.57]) and participants who reported poor quality sleep (OR 1.52 [95% CI: 1.32, 1.75]) also were at increased risk for stroke.
Symptoms of OSA were also strongly associated with increased stroke risk, including snoring (OR 1.91 [95% CI: 1.62, 2.24]), snorting (OR 2.64 [95% CI: 2.17, 3.2]), and breathing cessation (OR 2.87 [95% CI: 2.28, 2.6]).
Stroke risk increased as the number of sleep disturbance symptoms rose, with the greatest risk in the 11% of participants who had 5 or more symptoms (OR 5.38 [95% CI: 4.03, 7.18]).
"This study finds an association between a broad range of sleep impairment symptoms and stroke, and a graded association with increasing symptoms, in an international setting," Mc Carthy said.
Researchers are not sure what is driving the higher stroke risk among people with sleep disturbances.
Although the study did control for potential confounders, it was not designed to get at what is driving the association.
"Sleep disturbance may also have a bi-directional relationship with many stroke risk factors; for example, sleep disturbance may be a symptom of disease and exacerbate disease," McCarthy said. "Future interventional studies are required to determine the true direction of the relationship."
A Marker of Stroke RiskCommenting on the findings for Medscape Medical News, Daniel Lackland, DrPH, professor of neurology at the Medical University of South Carolina in Charleston, South Carolina, said the findings provide additional evidence of the link between sleep and stroke risk.
"The results confirm sleep disorders as a potential marker and part of the risk profile," he said.
Collecting information about sleep using a validated assessment tool is an important piece of clinical care, Lackland said, especially among patients with other stroke risk factors.
One limitation of the study was that researchers collected data on sleep only at one point and did not follow participants over time to see if changes in sleep affected stroke risk.
"This is an important point and should be a focus for future studies, as it is critical in the design of interventions," Lackland said.
The INTERSTROKE study is funded by the Canadian Institutes of Health Research, Heart and Stroke Foundation of Canada, Canadian Stroke Network, Swedish Research Council, Swedish Heart and Lung Foundation, The Health & Medical Care Committee of the Regional Executive Board, Region Västra Götaland, AstraZeneca Pharmaceuticals LP; Boehringer Ingelheim (Canada); Pfizer Inc. (Canada); Merck, Sharp and Dohme GmBH; the Swedish Heart and Lung Foundation; UK Chest; and UK Heart and Stroke. Mc Carthy and Lackland report no relevant financial relationships.
Neurology. Published online April 5, 2023.[1]
