Assertion: heart attack | /r/HasProperty | caused
Facets:
value: usually
type: DEGREE
value: almost always
type: TEMPORAL
Source sentences:
text: Some heart attacks are caused when a coronary artery contracts (spasms) and narrows.
text: Heart attack almost always is caused when a blood clot forms at the site of an existing fatty plaque that has narrowed the coronary artery.
text: A heart attack is usually caused when plaque — made of fat, cholesterol and other substances — slowly builds up in coronary arteries and then breaks open, causing a blood clot to form, according to the American Heart Association.
text: A heart attack is caused when blood flow through one or more of the heart (coronary) arteries that supply blood to the heart is cut off.