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氧是维持心肌正常收缩的关键性基质。由于冠状动脉血流突然中断引起急性心肌梗塞(AMI),相继产生心肌缺血、缺氧以及泵功能衰竭(即心肌收缩功能减弱),表现为收缩无力、收缩速度减慢,收缩期末心室内残余血量增多及心室内径变化速率减小等。左室短径平均变化速率是反映心肌收缩性的敏感指标之一。笔者从临床实际需要出发,用M型和二维超声心动图对正常人(NS)、AMI和陈旧性心肌梗塞(OMI)的收缩早期、中期和晚期及舒张早期、中期和晚期的左室短径平均变化速率(称之为“分期左室短径平均变化速率”,简称“分期速率”)的规律作了进一步探讨,并初步描述了该速率变化的曲线。
Oxygen is the key substrate for maintaining normal myocardial contractility. Acute myocardial infarction (AMI) due to a sudden interruption of coronary blood flow, resulting in myocardial ischemia, hypoxia and pump failure (ie, diminished myocardial contractility), manifested as weakness in systole, slowing of the rate of systole, residual ventricular remodeling at the end of systole Increased blood volume and ventricular diameter change rate decreases. The average rate of left ventricular minor axis changes is one of the sensitive indicators of myocardial contractility. The author from the actual clinical needs, with M-mode and two-dimensional echocardiography of normal (NS), AMI and old myocardial infarction (OMI) contraction early, middle and late and early, middle and late diastolic left ventricular short The average rate of change of the diameter (referred to as the “average rate of change of staging left ventricular short diameter”, referred to as “staging rate”) is further discussed, and initially describes the rate of change curve.