静脈動における相奇異の空間的分布

Miguel Valderrábano¹, Peng-Sheng Chen, Shien-Fong Lin

¹Division of Cardiology, Department of Medicine, Cedars-Sinai Medical Center and David Geffen School of Medicine, University of California Los Angeles, Calif 90048, USA.

Circulation

|July 2, 2003

まとめ

室細動 (VF) の相異性 (PSs) はランダムではない. それらは解剖学的構造に沿って集まって,VFの複雑さに影響を及ぼし,潜在的に新しい突然死治療法を導く可能性があります.

科学分野:

心臓電気生理学心臓電気生理学
コンピュータ生物学コンピュータ生物学
メディカルイマージング (医学イメージング)

背景:

静脈細動 (VF) は複数の興奮波を伴うが,その組織は完全に理解されていない.
フェーズ・シンギュラリティ (PSs) は,曖昧なアクティベーションと基礎となる再入力の場所を表すVFの主要な源です.
PS形成のメカニズムを理解することは,効果的な急性心臓死治療の開発に不可欠です.

研究の目的:

室細動 (VF) 中の相異性 (PSs) の空間的組織と分布を調査する.
PS形成と心臓の解剖学的構造との関係を決定する.
PSの行動がVFで観察される複雑な活性化パターンにどのように貢献するか解明する.

主な方法:

光学的に記録された信号の自動化されたPS検出アルゴリズムを使用して,細動する心室で電圧,相,およびPSマッピングを行いました.
繊維アポポジションと内壁血管を含む顕微鏡の解剖学的特徴を持つ相関PSの位置.
行動分析のための自己相関を含む,PSの寿命,発生率,空間分布を分析した.

主要な成果:

フェーズ・シンギュラリティ (PSs) は,上心血管,内心筋,およびパピラリ筋の挿入に沿って非ランダムなクラスタリングを示した.
これらの解剖学的構造は安定剤として作用し,PSsがそれらに対してコロカライズされ,寿命が大幅に長くなった (82.46 ms vs. 40.5 ms).
右心室内内臓は,上心臓よりも高いPS発生率を示した; 不規則な行動は,空間的に,解剖学的異質性に制限されていた.

結論:

VFにおける相特異性 (PSs) は空間的に組織され,正常な解剖学的異質性でコロカライズされます.
PSの安定した空間的分布は,PSの変数的な行動や寿命と組み合わせて,VFの特徴である複雑でダイナミックな活性化パターンを生み出します.
この非ランダム分布は,VFのメカニズムと潜在的な治療目標についての洞察を提供します.

さらに関連する動画

12:09

Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations

Published on: January 8, 2013

07:13

Assessing Intracardiac Vortices with High Frame-Rate Echocardiography-Derived Blood Speckle Imaging in Newborns

Published on: December 22, 2023

関連する概念動画

01:25

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...

01:28

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.

01:13

Location and Orientation of the Heart

The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.

01:16

Chambers of the Heart

The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
Deoxygenated blood from the body is received in the right...

01:29

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...

01:26

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...

関連する実験動画