関連する実験動画
Updated: Jul 15, 2026

13:42
A Murine Closed-chest Model of Myocardial Ischemia and Reperfusion
Published on: July 17, 2012
まとめ
エピカルディアのSTセグメントの高さ (ST) の分布は,冠動脈閉塞後の時間とともに変化します. 初期のイシュケミアは均一なSTを示し,後のイシュケミアはグラデーションを示し,現在の損傷モデルに影響を与えます.
科学分野:
- 心血管生理学 心血管の生理学
- 発血性心疾患の研究について
- バイオメディカルエンジニアリング
背景:
- 冠動脈閉塞は心筋不全を引き起こし,心臓の電気活動を変化させます.
- エピカルディアのSTセグメントの上昇 (ST) は,急性心筋梗塞の重要な指標である.
- STダイナミクスを理解することは,不血症イベントの診断と管理に不可欠です.
研究 の 目的:
- 冠動脈閉塞後の上心部STセグメントの上昇 (ST) の時空特性を調査する.
- 缺血領域の大きさの変化がSTの振幅と分布にどのように影響するかを分析する.
- 既存の損傷モデルの評価をするために,心筋不全の現在の世代を評価する.
主な方法:
- 高解像度の電極配列を用いて記録された心膜電図は,バビオンや豚の体内で撮影したものです.
- 冠動脈閉塞が誘発され,その後8時間連続STモニタリングが行われました.
- 豚の不血性領域の大きさを操作して,STの変化を観察した.
主要な成果:
- 当初,STはイシュケミア領域全体に均一であった (最初の20分).
- 周辺から中心へのSTのグラデーションは,イシュケミアの20分後に発達した.
- 動脈不全領域の増大は,STの幅を有意に増加させた (58%);領域の減少はSTを減少させた (24%).
結論:
- 初期性イシュケミア (<20分) は,イシュケミアの境界から発生する損傷の流れと一致します.
- 後発性イシュケミア ( > 20分) は,損傷電流が全身のイシュケミア領域で生成されていることを示唆しています.
- STセグメントの上昇ダイナミクスは,心筋損傷の進化に関する洞察を提供し,現在の損傷モデルに情報を提供します.
関連する概念動画
Anatomy of the Heart
The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
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.
Heart Valves
The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
Anatomy of the Heart
The heart is a hollow, muscular organ approximately the size of a fist, consisting of four chambers. It is enclosed in the pericardium, a fibrous sac with two layers: the visceral and parietal pericardium, separated by a fluid-filled space containing serous fluid to reduce friction.
The heart has three layers: the innermost endocardium, the muscular myocardium, and the outer epicardium, all working together for optimal cardiac function.
Chambers of the Heart
The heart is made up of four...
The heart has three layers: the innermost endocardium, the muscular myocardium, and the outer epicardium, all working together for optimal cardiac function.
Chambers of the Heart
The heart is made up of four...
Electrocardiogram Fundamentals
Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...

