在因实验体积过载而导致收缩功能障碍的狗中冠状动脉血流
B A Carabello1, K Nakano, K Ishihara
1Cardiology Division, Medical University of South Carolina, Charleston 29425.
Circulation
|March 11, 1991
概括
冠状动脉血流异常不会导致体积过载的收缩功能障碍. 患有这种疾病的狗在压力期间保持显著的冠状动脉血流储备.
科学领域:
- 心血管生理学心血管生理学
- 心脏过度缩小的情况.
背景情况:
- 冠状动脉血流异常导致压力过载高的收缩功能障碍.
- 冠状动脉血流在体积过载高的作用不太清楚.
研究的目的:
- 为了测试冠状动脉血流异常是否导致收缩功能障碍,在实验体积过载过度增大中进行了测试.
主要方法:
- 检查了慢性部吐的狗在休息和步行时的冠状动脉血流.
- 测量左心室质量和收缩功能.
- 在腺输注和快速心房节奏过程中评估冠状动脉血流.
主要成果:
- 副心脏反导致左心室缩和收缩功能障碍.
- 静止冠状动脉的血液流动在两回和对照犬中是相似的.
- 冠状动脉血流与步调和腺在米特拉狗适当增加,表明冠状动脉流量储备的保存.
结论:
- 冠状动脉血流异常并不能解释在 mitrale 吐诱导的缩功能障碍的休息状态.
- 在这种体积过载高的模型中,存在大量的冠状动脉血流储备.
相关概念视频
01:29Pathophysiology of Cardiac Performance
Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
01:26Imbalances in Cardiac Output
The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
01:22Cardiac Output II: Effect of Stroke Volume on Cardiac Output
Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...