Assertion: heart murmur's heart | /r/CapableOf | struggle to pump blood
Facets:
value: in the absence of enough oxygen
type: CAUSE
Source sentences:
text: Cardiologists say several scenarios could be unfolding: The heart may struggle to pump blood in the absence of enough oxygen; the virus may directly invade heart cells; or the body, in its attempt to eradicate the virus, may mobilize a storm of immune cells that attack the heart.