Details are unknown but cardiac arrest, major stroke and serious road crashes would all fall into this category.
Doctors have expressed concern after a body builder who took high doses of "energy pills" suffered a major stroke.
Broadcaster Andrew Marr has appeared on television for the first time since suffering a major stroke, saying he feels "lucky to be alive".
In the clinical trial presented at ACC, there was 1 extra stroke for every 25 people, and a major stroke for every 40.
The role of one major cause of stroke, atrial fibrillation (AF), has not been the subject of close scrutiny.
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Eliquis now has the unique distinction of being the only new anticoagulant to reduce stroke, major bleeding, and death versus the gold standard warfarin in atrial fibrillation patients (the largest commercial opportunity, in our view).
"Patients in general clinical practice are older and sicker than the selected patients enrolled in research trials, so deaths from major side effects such as stroke, bleeding and cardiac rupture may be more common, " he said.
To ensure that other factors that could affect heart-disease rates were not playing a role, the researchers also adjusted for the total amount of calories the groups were eating, since obesity can be a major contributor to heart attack and stroke.
Cink is looking for his first victory since the 2009 British Open, but he and Haas were just one shot ahead of a group of four players -- and another nine were a stroke further back, including former major winners Louis Oosthuizen, Angel Cabrera and Keegan Bradley plus ex-world No. 1 Lee Westwood.
It was my first major assignment since returning to work after a serious stroke earlier that year.
Studies of free radicals, a major suspect in aging, led to a promising stroke drug now in final-stage trials at AstraZeneca.
They are a stroke clear of the field, with former major winners Justin Leonard and David Duval among a group three shots off the lead.
The companies said the drug showed Elquis significantly reduced the risk of stroke or systemic embolism by 21%, major bleeding by 31%, and mortality by 11%.
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Dr Philip Gorelick, from Michigan State University, said the studies were "major steps forward in the successful treatment of acute ischaemic stroke, and pave the way for new treatment options".
The 14-time major winner carded six birdies during his round of 67, one stroke off his career best score at the event.
Half of the stroke patients in the study lived within 1km of a major road in the Boston metropolitan region, and the rest lived between 1km and 10km (six miles) away.
Scott's win means four of the last six major champions used a putter pressed against their belly or chest, a stroke that might be banned in 2016.
When asked about that penalty, Woods said, "Rules are rules, " even though stroke penalties for slow play are incredibly rare on the PGA Tour and at major championships.
The primary endpoint was the time to first major vascular event, defined as the composite of non-fatal MI or coronary death, any stroke or any arterial revascularization.
With a one-stroke lead, he was trying to hit a scramble shot to save par and win his first major championship.
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Physicians and scientists traded information on major clinical trials this week at an American Heart Association conference, sharing discoveries and treatment tactics for heart attack and stroke.
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