心源性休克由于心脏的机械性功率降低而产生,它可有3个原因:①心脏节律障碍;②心脏活动受到机械性阻碍;③心脏收缩力减弱(如在心肌梗死时)。上述原因中的一个或多个常使心脏每分输出量减少至其原值的1/3,并使微动脉因儿茶酚胺释放而发生最强的收缩,伴有组织缺氧和酸中毒,后者又引起毛细血管的最大扩张和血流变慢,伴有血浆和血细胞成分的分离。当心脏活动因心包渗液或心包积血而受到机械性 Cardiogenic shock is caused by a decrease in the mechanical power of the heart, which can occur for three reasons: ① heart rhythm disorders; ② mechanical disturbance of heart activity; ③ diminished cardiac contractility (as in myocardial infarction). One or more of these causes often reduce the cardiac output to one-third of its original value and cause the strongest contraction of the arteriole due to catecholamine release, with hypoxia and acidosis, the latter Also caused the greatest expansion of capillaries and blood flow slowed, with the separation of plasma and blood cell components. Cardiac activity is mechanical due to pericardial effusion or pericardial hemorrhage