Factors influencing indices of left ventricle contractility in the conscious dog.
Factors influencing indices of left ventricle contractility in the conscious dog.
复制标题
影响清醒狗左心室收缩指数的因素。
DOI：
10.1093/cvr/8.3.299
复制
发表时间：
1974
影响因子：
10.8
通讯作者：
J. Ross
中科院分区：
文献类型：
--
作者：
D. M. Davidson;J. Covell;C. Malloch;J. Ross
Left ventricular function and isovolumic indices of contractility were examined in the awake, chronically instrumented dog to assess their ability to detect changes in inotropic state, and their response to changes in left ventricular end-diastolic pressure (LVEDP). During the initial 8–10 beats following inferior vena cava (IVC) occlusion, the relation between stroke volume and LVEDP exhibited substantial variations in the basal state and, although useful for defining acute responses to isoproterenol (1 μk), it did not detect a response to propranolol (0-· mg/kg). Of the many isovolumic indices examined in the index (dP/dt)/DP at a developed LVP of 40mmHg [(dP/dt)/DP40] offered the least scatter and sensitivity to LVEDP changes and it was sensitive to acutely induced changes in inotropic state. However, this ratio and other isovolumic indices responded poorly to contractility changes originating from LVEDP levels below 4 mmHg. Moreover, its basal level exhibited wide variation in the same animal on different days and in different normal animals.
