A.心排血量下降及心室充盈受限 B.心排血量下降及肺靜脈壓力增高 C.心排血量下降及體循環(huán)靜脈壓力增高 D.心排血量下降及體、肺循環(huán)靜脈壓增高 E.心排血量下降及心臟前負(fù)荷不足