肺動脈高血圧における心室幾何学,張力,および回転力学
Sarinya Puwanant1, Margaret Park, Zoran B Popović
1Department of Cardiovascular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA.
Circulation
|January 6, 2010
まとめ
右心室 (RV) の圧力過負荷は,RVの機能を低下させ,左心室 (LV) の幾何学を変化させ,LVのトルションとセグメンタルストレスの減少につながります. これらの変化は,RV機能障害が心臓の全体的なメカニズムに及ぼす重大な影響を強調しています.
科学分野:
- 心臓病学 心臓病学
- 心血管生理学 心血管の生理学
- エコーカルディオグラフィー エコーカルディオグラフィー
背景:
- 右心室 (RV) 圧力過負荷は,重要な臨床問題である.
- 左心室 (LV) の幾何学とメカニズムに対するその影響は完全に理解されていません.
- RV圧力過負荷とLV機能の関係を調査することは,心血管疾患の進行を理解するために不可欠です.
研究 の 目的:
- RVの圧力過負荷がRVの機能に影響するという仮説を検証する.
- RVの圧力過負荷がLVの幾何学とメカニズムに影響するかどうかを判断する.
- LVのトウィストメカニズムとセグメンタル機能に対する有害な影響を評価する.
主な方法:
- 44人の肺高血圧患者と44人のマッチングした健康な対照群における将来的なエコー・カルディオグラフィーイメージング.
- 本質的なLV疾患を有する患者の除外.
- RVとLVの縦延ばし (LS) と周回延ばし (CS),およびLVのトルションの測定.
主要な成果:
- 肺高血圧の患者は,対照群と比較して,RV LSと静脈間隔膜 (IVS) LSの減少を示しました.
- LV側壁LSは保存されたが,IVSとLV側壁CSは減少した.
- 肺高血圧の患者では,肺動脈のトルションが有意に低下し,肺動脈シストリック圧力と肺動脈特異度指数と逆相関していました.
結論:
- 慢性的なRV圧力過負荷は,RVの縦断性シストリック変形を直接損なう.
- RVの圧力過負荷はIVSとLVの幾何学に影響を与え,LVのトルションとセグメンタルストレスの悪影響を及ぼします.
- 静脈間隔膜は,静脈間隔膜のフリー壁よりも影響を受けます.
さらに関連する動画
関連する概念動画
01:30Pulmonary Hypertension: Classification and Pathogenesis
911
Pulmonary hypertension (PH) is a severe health condition in which the mean pulmonary arterial pressure increases to 25 mmHg or more, even when the body is at rest. This high pressure in the blood vessels that transport blood from the heart to the lungs can cause various symptoms, including shortness of breath, can lead to right heart failure, and significantly affect the overall quality of life.
There are various classifications for PH, each relating to different underlying causes and also...
There are various classifications for PH, each relating to different underlying causes and also...
911
01:20Mitral Regurgitation I: Introduction
1.3K
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...
1.3K
01:22Mitral Stenosis I: Introduction
1.8K
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...
1.8K
01:29Heart Failure II: Pathophysiology
2.1K
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...
2.1K
01:29Cardiomyopathy III: Hypertrophic Cardiomyopathy
810
Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
810