Assertion: heart attack | /r/HasProperty | a blockage of blood flow
Facets:
Source sentences:
text: A heart attack occurs when there is a blockage of blood flow to the heart.
text: A heart attack is a blockage of blood flow to the heart, often caused by a clot or build-up of plaque lodging in the coronary artery (a blood vessel that carries blood to part of the heart muscle).