More demand and reduced supply means that some of the ventricular muscle starts to have weaker contractions —leading to systolic failure.

需求增大而供血减少，意味着一些心肌开始虚弱地收缩，导致收缩性心衰。

In the lead and with no current traveling through the dead left ventricular muscle under needed.

无电流通过坏死的左心室肌。

Another term for this is having a reduced " preload" which is the volume of blood that's in the ventricle right before the ventricular muscle contracts.

形容这一现象的术语是为心脏前负荷减少，指的是心室在心肌收缩前的血量。