在心力衰竭的发展过程中,左心房对心室填充的贡献
1Henry Ford Heart and Vascular Institute, Department of Medicine, Detroit, Mich.
Circulation
|October 1, 1992
概括
在心力衰竭中,左心房最初会弥补左心室早期填充量的减少. 然而,随着 LV 功能障碍的恶化,左心室对 LV 填充的贡献下降,这表明内在功能障碍.
科学领域:
- 心脏病学 心脏病学
- 心血管生理学心血管生理学
- 心脏衰竭研究研究
背景情况:
- 异常的左心室 (LV) 填充是心力衰竭的标志,表现出异质的 mitrale 流入速度.
- 在心力衰竭的发展过程中,左心房在LV填充中的作用仍未完全阐明.
研究的目的:
- 为了研究左心房对LV填充的动态贡献,在逐渐心力衰竭的犬类模型中.
- 分析早期LV填充 (Ei) 和左心房填充 (Ai) 组件的时间变化.
主要方法:
- 通过连续的冠心微球栓塞,在八只狗中诱导了心力衰竭.
- 脉冲多普勒回声心脏学被用来测量在栓塞后的各种时间点上 mitra 流入速度.
- 基于时间-速度积分的早期LV填充 (Ei) 和左心房填充 (Ai) 的量化.
主要成果:
- 早期 LV 填充 (Ei) 从基线 (7.6 厘米) 逐渐减少到 33 周 (4.0 厘米) (p<0.01).
- 左心房填充 (Ai) 最初在3周增加 (2.7厘米),但随后在33周下降到基线 (0.8厘米) 以下 (p<0.01).
- 这些变化与减少的LV喷射分数和增加的LV末腹筋壁应力,左心房尺寸和分数缩短相关.
结论:
- 左心房对LV填充的初始增加可能代表了早期LV填充减少的补偿机制.
- 渐进的LV功能障碍导致左心房贡献的下降,这表明内在的左心房功能障碍.
- 增加 LV 扩张性壁压力可能会导致左心房肌动脉的工作负载和随着时间的推移而导致的功能障碍.
相关概念视频
Imbalances 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...
Cardiac Catheterization III: Left Heart Catheterization
Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...
Mitral Regurgitation I: Introduction
Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
Mitral Stenosis I: Introduction
Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
Aortic Regurgitation I: Introduction
IntroductionAortic regurgitation is characterized by the backward flow of blood from the aorta into the left ventricle during diastole and arises from the improper closure of the aortic valve. This condition results in left ventricular volume overload and can stem from both acute and chronic etiologies, each contributing uniquely to the disease's progression and symptomatology.Acute and Chronic CausesAcute aortic regurgitation often results from events that suddenly impair the integrity of the...
Heart Failure II: Pathophysiology
Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...


