関連する実験動画
Updated: Jun 6, 2026

07:56
A Model of Long-Term Ventricular Fibrillation in Isolated Rat Hearts
Published on: February 17, 2023
室細動に対する感受性の顕著な変動は,実験的なコンモチオ・コルディスモデルで示された
Alawi A Alsheikh-Ali1, Christopher Madias, Stacey Supran
1Cardiac Arrhythmia Center, Division of Cardiology, Tufts Medical Center, 800 Washington St, Box 197, Boston, MA 02111, USA.
Circulation
|December 4, 2010
まとめ
胸部への打撃による突然の心臓発作,または突然の心臓発作は,個人の感受性のために稀です. 胸部への衝撃による心房細動 (VF) に高い脆弱性を示した動物もおり,人間にも同様の感受性が示唆されている.
科学分野:
- 心臓病学 心臓病学
- スポーツ医学 スポーツ医学
- 生理学 生理学とは
背景:
- 心臓前部の打撃は,心房細動 (VF) を誘発し,commotio cordisとして知られる希少なイベントである.
- 衝撃要因は極めて重要であるが,個々の感受性は,コンモチオ・コルディスの発生に影響を及ぼすと仮定されている.
研究 の 目的:
- VF誘導に対する個々の動物の感受性を評価するには,コンモチオ・コルディスモデルを使用します.
- 胸壁への衝撃後にVFの感受性に関連した動物の特徴を特定するために.
主な方法:
- 胸壁への打撃を受けた139頭の未成年豚の遡及的分析.
- 衝撃は,心循環再極化の脆弱なウィンドウの間に心臓のシルエットに届けられました.
- VFに対する個々の感受性と関連する生理学的パラメータが評価されました.
主要な成果:
- 合計1274のインパクトのうち28%がVFを誘発し,個々の動物の感受性の有意な変動があった.
- ほとんどの動物は,VFを誘発するために<30%の打撃を必要とし,VFを一貫して開発した動物は5% (>80%の衝撃) しかありませんでした.
- 左心室圧,QRSの持続時間,QTcの変動は,VFリスクの有意な相関関係であった.
結論:
- 豚は,衝撃誘発性VFに対する幅広い個人の脆弱性を表しており,少数派は非常に感受性があります.
- 心臓の脱極化および再極化における微妙な異常が,この感受性の根底にある可能性があります.
- 個人の感受性は,ヒトにおけるコンモチオ・コルディスの希少性を説明する可能性がある.
関連する概念動画
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.
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...
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Electrophysiology of Normal Cardiac Rhythm
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...
Dysrhythmias III: Characteristics of Dysrhythmias
Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per minute.
Dysrhythmias IV: Characteristics of Bradyarrhythmias
Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
