Idiopathic hypertrophic cardiomyopathyにおけるダイナミックとパッシブダイアストリック圧力-体積関係との間の顕著な不一致
P H Pak1, L Maughan, K L Baughman
1Department of Internal Medicine, Division of Cardiology, The Johns Hopkins Medical Institutions, Baltimore, Maryland 21287, USA.
Circulation
|July 1, 1996
まとめ
イディオパシー性多動性心筋症 (HCM) 患者は,被動的関係と有意に異なる,明確な腹圧-体積曲線を示します. これは,HCMにおける高圧填埋圧は,空洞の硬さだけでなく,負荷条件の影響を受けていることを示唆しています.
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
- バイオメディカルエンジニアリング
背景:
- Idiopathic hypertrophic cardiomyopathy (HCM) は,高室硬さで予想されるよりも浅いダイナミックダイアストリック圧力-体積曲線を示します.
- 本研究では,HCMにおける圧力-体積充填曲線と,受動的な末期腹筋圧力-体積関係 (EDPVR) の間の不一致を調査しています.
研究 の 目的:
- HCM患者における被動的なEDPVRからダイナミックな静脈圧-体積曲線の偏差の背後にあるメカニズムを探求する.
- HCMにおける圧力-体積ダイナミクスを,正常な被験者,高血圧性多動症,および拡張性心筋病症と比較する.
主な方法:
- 浸透的な圧力-体積分析と導電性カテーテル法が42人の患者で採用されました.
- 末端下静脈圧量比 (EDPVR) は,下静脈内流入阻害時に記録された.
- 患者には9人がHCM,11人がLV機能正常,13人がLVH-HTN,そして9人がDCMでした.
主要な成果:
- HCM患者には,はっきりとした平らな圧力-体積充填 (PVR fill) 曲線があり,急なEDPVRと著しく異なる.
- 対照的に,正常,LVH-HTN,およびDCM群は,PVR充填とEDPVR.の間の微小な偏差を示した.
- HCM PVR補充曲線は,他のグループ (-2+/-2 mm Hg; P<.001) と異なり,プレロードの減少 (-10+/-4 mm Hg) と並行して下方にシフトしました.
結論:
- HCMにおける左心室 (LV) 充填圧の上昇は,空洞の硬さだけでなく,負荷に依存するオフセット圧力によって影響を受けます.
- ダイナミック充填とパッシブEDPVRの間の大きな差異は,HCMに特有のようです.
- 安定状態データからの硬さの解釈には注意が必要です;幾何学と相互作用を標的とした治療は,HCMにおけるLVダイアストリック圧力に影響を与える可能性があります.
さらに関連する動画
関連する概念動画
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...
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...
Cardiomyopathy I: Introduction and Classification
Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
Cardiomyopathy II: Dilated Cardiomyopathy
Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
Cardiomyopathy III: Hypertrophic Cardiomyopathy
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...
Cardiomyopathy IV: Restrictive Cardiomyopathy
Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...


