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评价左心室功能是临床和科研工作中经常遇到的问题,其目的是判断疗效、指导治疗、估计预后、确定手术指征或禁忌证,以及评价药物的心肌变力作用等。一、左室功能的影响因素一般所说的左室功能,是指整体情况下心脏的泵机能。若以心输出最来体现左室功能,其影响因素可用下图表示:一今心软出童(升/分)(一每搏童个心率 ,}心肌收缩性前负荷岭个心肌舒张性能前负荷:完整心脏的前负荷指左室舒末容量或舒末压。使共他因素固定,在一定范围内增加前负荷,能使收缩力增加,表现为每
Evaluation of left ventricular function is often encountered in clinical and scientific research problems, its purpose is to determine the efficacy, guide treatment, prognosis, to determine the surgical indications or contraindications, and to evaluate the role of drug myocardial deformation. First, the impact of left ventricular function Generally referred to as left ventricular function, refers to the overall situation of the heart pump function. If the output of the heart to the most reflect the left ventricular function, the impact of factors can be shown in the following figure: A heart to soft child (L / min) (a stroke child heart rate, myocardial contractility front load ridge of myocardial relaxation before the load : The intact heart before the load refers to the left ventricular end-diastolic volume or end-pressure so that a total of his factors fixed in a certain range to increase the pre-load, can increase the contractility, manifested as