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急性心肌梗死或急性心力衰竭时,可使心搏出量减少,脑血流量也随之减少,而引起弥漫性或局灶性神经症状和体征。慢性心搏出量减少,也可引起慢性脑血流量减少。若心力衰竭长期存在且严重,特别是伴有脑动脉硬化时,可使自动调节机制发生障碍。Corday以动物实验研究脑的血流量,发现房性早搏时,平均减少80%,室性早搏时,平均减少12%,当房性心动过速、心房颤动或心房扑动伴有快室率时,平均减少23%,当非常快的室率时,平均减少40%。作者应用~(133)氙测定31例慢性心房颤动而不伴有心力衰竭和神经系统疾患患者的局部脑血流量。31例患者中男14例,女17例,年龄为35～80岁(平均60.3岁),血压正常者30例,仅1例有高血压。31例中有27例局部脑血流量低于相同年龄的正常对照组。各
Acute myocardial infarction or acute heart failure, can reduce the volume of stroke, cerebral blood flow also decreases, causing diffuse or focal neurological symptoms and signs. Chronic cardiac output reduced, can also cause chronic cerebral blood flow reduction. If the long-standing and serious heart failure, especially with cerebral arteriosclerosis, can make the mechanism of auto-regulatory obstacles. Corday to animal experiments in the study of brain blood flow and found that atrial premature beats, the average reduction of 80%, premature ventricular contractions, an average reduction of 12%, when atrial tachycardia, atrial fibrillation or atrial flutter with fasting rate , An average reduction of 23%, when the room rate is very fast, an average reduction of 40%. The authors used ~ (133) xenon to determine regional cerebral blood flow in 31 patients with chronic atrial fibrillation who were not associated with heart failure and neurological disorders. 31 patients were 14 males and 17 females, aged 35 to 80 years (mean 60.3 years), normal blood pressure in 30 cases, only 1 case of hypertension. Twenty-seven of 31 patients had a lower local cerebral blood flow than the normal control group of the same age. each