Marijuana use might lead to higher risk of stroke, World Stroke Congress to be told

October 19, 2018

WHAT: 11th World Stroke Congress brings together leading international stroke experts and an unparalleled scientific program covering epidemiology, prevention, acute care, rehabilitation and recovery in 100s of sessions and oral posters. Congress is attended by stroke professionals, researchers, policy makers, survivors and caregivers from around the world. #worldstroke2018

WHERE: Montreal, Canada, Palais des Congrès

WHEN: October 17 - 20, 2018

MEDIA OPPORTUNTIES: Stroke experts and people with lived experience of stroke will be available for interviews.

TODAY'S CONGRESS HIGHLIGHTS

Late-breaking trials

HOT TOPIC: Review of U.S. hospital statistics shows rise in stroke incidence among marijuana users from 2010-14 while overall stroke prevalence remained stable

A five-year study of hospital statistics from the United States shows that the incidence of stroke has risen steadily among marijuana users even though the overall rate of stroke remained constant over the same period.

The study, presented today during the third day of the World Stroke Congress in Montreal, looked at U.S. hospital statistics from 2010 to 2014. It examined a total of 2.3 million hospitalizations among people who used marijuana recreationally. Of these, 32,231, or 1.4 percent, had a stroke including 19,452 with acute ischemic stroke (AIS).

Over the five years studied, the rate of stroke of all types among marijuana users increased from 1.3 percent to 1.5 percent. The rate of AIS increased from 0.7 percent to 0.9 percent. During the same five-year period, the prevalence of stroke among all patients was stable.

As result, the researchers conclude that these growing trends of stroke among marijuana users "warrant further prospective studies to evaluate the marijuana-stroke association amidst legalization of recreational use."

The researchers noted in introducing their study that marijuana "has a potential link to stroke owing to cerebrovascular effects of cannabinoids."

HOT TOPIC: Young stroke survivors at high long-term risk of adverse outcomes

A significant percentage of strokes - estimated from 8-21 per cent - affect adults under age 45. A Canadian study by senior author Dr. Richard Swartz and his team sought to determine what the future might hold for these young patients who show no early complications from their initial stroke.

This analysis of more than 26,000 young stroke survivors using data from the Institute for Clinical Evaluative Sciences (ICES) showed that, although absolute rates of adverse events including recurrent stroke, heart attack, death and institutionalization were low among young clinically stable stroke patients, these patients still showed 7 times the risk of having an adverse complication one year after their initial stroke compared to only twice the risk among older patients. After accounting for other vascular risk factors, long-term risks remained at almost 3 times that of young controls, even for these patients who were clinically stable and had no early complications during what is considered the high-risk period immediately after a stroke.

"This study shows us that even young stroke and TIA patients who are clinically stable after their stroke remain at a significant risk of adverse events, like another stroke, death or requiring long- term care," said lead study author Dr. Jodi Edwards of the Brain and Heart Nexus Research Program at the University of Ottawa Heart Institute. "This is important as it highlights the need for guidelines and strategies for long-term aggressive prevention to reduce stroke risk in young stroke patients."

HOT TOPIC: Three studies highlight changes in stroke care in Quebec

With the World Stroke Congress being held in Montreal it is appropriate that there are three presentations concerning the evaluation of different aspects of stroke care in the province of Quebec. The lead author is Dr. Laurie Lambert, Coordinator of the Cardiovascular Evaluation Unit of Quebec's Institut national d'excellence en santé et en services sociaux (INESSS).

The first presentation evaluates changes in processes and quality of care in Québec's comprehensive stroke centres following a province-wide field evaluation in 2013-14 and the development and implementation of a plan to promote best practices by the Ministry of Health. It found that times to initiating treatment improved, with the proportion treated with thrombolysis in less than 60 minutes increasing from 47 to 80 per cent and that more patients in these centres were admitted to a stroke unit: 91 per cent in 2016-17 compared to 75 per cent previously.

The second presentation compares care pathways in the four regional networks and the third compares treatment delays for thrombectomy between direct admission and inter-hospital transfer patients. For transferred patients, median first door-to-puncture time was 171 minutes (142-224). For patients directly admitted to a comprehensive stroke centre, the median first door-to-puncture was 69 minutes (50-100).

HOT TOPIC: Canadian researchers identify age and sex differences in stroke care

Two studies by Toronto researchers look at age and sex differences in stroke care in Canada. One study looking at data from 2003-16 concluded that in-hospital deaths from stroke decreased for all patients, but the group most at risk is older women.

The second study by the same researchers was presented on Oct. 18 and looked at data from 2014-16. It concluded younger adults are more likely to get alteplase clot-busting medication, access stroke units and be discharged home independently than older adults, and women of all ages are less likely to be discharged home independently.

HOT TOPICS: Other presentations of interest on the third day of the Congress:
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11th World Stroke Congress

The 11th World Stroke Congress, being held Oct. 17-20, 2018, at the Palais des Congrès in Montreal, Quebec, brings together leading international stroke experts and an unparalleled scientific program covering epidemiology, prevention, acute care and recovery in hundreds of sessions and oral posters. The Congress is attended by stroke professionals, researchers, policy makers and people with lived experience from around the world. This is the first time the biennial Congress has been held in North America in 12 years; the 2016 Congress was held in Hyderabad, India. This year's Congress is jointly organized by the World Stroke Organization (WSO) and the Canadian Stroke Consortium (CSC). Co-presidents are Dr. Werner Hacke, WSO President, and Dr. Mike Sharma, CSC Chair. WorldStrokeCongress.org/2018

ABOUT STROKE

A stroke happens when blood stops flowing to a part of the brain or bleeding occurs in the brain. This interruption in blood flow or bleeding into the brain leads to damage to the surrounding brain cells which cannot be repaired or replaced; 1.9 million brain cells die every minute during a stroke. Stroke can happen at any age. Stroke affects everyone: survivors, family and friends, workplaces and communities. The effects of a stroke depend on the part of the brain that was damaged and the amount of damage done. Ischemic stroke is the most common form of stroke, caused by a sudden blocked artery (about 85% of all stroke). A transient ischemic attack (TIA) is sometimes called a mini-stroke and is the mildest form of ischemic stroke. A TIA is an ischemic stroke, caused by a briefly blocked artery with rapid spontaneous unblocking of the artery leading to only a short period of brain malfunction. However TIAs are an important warning that a more serious stroke may occur. Hemorrhagic stroke occurs when a blood vessel ruptures, causing bleeding in or around the brain (about 15% of all stroke). Recovery from stroke starts right away. The quicker the signs are recognized, and the patient is diagnosed and treated, the greater likelihood of a good recovery, with less chance of another stroke, and decreased healthcare costs. The first few hours after stroke are crucial, affecting the recovery journey for years to come.

The impact of stroke around the world

Stroke in Canada

World Stroke Organization The World Stroke Organization (WSO) is the only global organization with a sole focus on fighting stroke. WSO's mission is to reduce the global burden of stroke through prevention, treatment and long term care. WSO provides a strong voice for stroke professionals, survivors and caregivers in global and regional policy. The Organization is a WHO implementing partner and has UN approved consultative status. http://www.world-stroke.org

Canadian Stroke Consortium

The Canadian Stroke Consortium is the professional organization for stroke neurologists and other physicians interested in stroke. Our members are committed to reducing the burden of stroke through the translation of clinical research into routine patient care. Increasing capacity for high quality research, enhancing the capability of stroke services, leading comprehensive knowledge translation programs, and advocating in health policy and systems of care affecting stroke represent the four pillars of CSC's activities. strokeconsortium.ca

Heart and Stroke Foundation of Canada

Life. We don't want you to miss it. That's why Heart & Stroke leads the fight against heart disease and stroke. We must generate the next medical breakthroughs, so Canadians don't miss out on precious moments. Together, we are working to prevent disease, save lives and promote recovery through research, health promotion and public policy. heartandstroke.ca

For more information and to set up interviews contact: Diane Hargrave, dhprbks@interlog.com
416-467-9954, ext. 102

Heart and Stroke Foundation of Canada

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