関連する実験動画
Updated: Jul 12, 2026

08:13
Optical Mapping of Action Potentials and Calcium Transients in the Mouse Heart
Published on: September 13, 2011
慢性抗不律性療法中に心室外皮活動における自発的変動
J L Anderson1, M I Anastasiou-Nana, R L Menlove
1Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City.
Circulation
|September 1, 1990
まとめ
静脈動脈不全の頻度の変動は,効果的な抗リズム薬療法の間でも有意である. 単一のホルターテストは,広範囲の自発的変動性のために,治療の有効性を正確に反映しない可能性があります.
科学分野:
- 心臓病学 心臓病学
- 臨床電気生理学 臨床電気生理学
背景:
- 静脈動脈不全の変動に関する以前の研究は,治療なしの記録に依存していました.
- 効果的な抗不律性薬剤治療中の変動性を評価することは,正確な評価に不可欠です.
研究 の 目的:
- 効果的な抗不律性薬物療法中に早発性心室複合体 (PVCs) 抑制における変動性を評価する.
- 治療中のPVC周波数の自発的な変動の信頼限界を決定する.
主な方法:
- 有効な抗不律療法を受けている慢性不律症の55人の患者からの外来心電図記録を分析した.
- 効果的な治療は,総PVCの70%以上の減少,または繰り返し発生する形態のPVCの90%以上の減少として定義されます.
- 年齢,性別,病因,心臓機能,薬剤による患者サブグループにおける抑制の可変性を調べました.
主要な成果:
- PVC抑制の有意な変動が観察され,時間の経過とともに有効性が著しく低下しました.
- 患者の19%は,総PVCの60%以下の抑制の喪失を経験し,16%はPVCの頻度がベースラインより増加しました.
- PVCの頻度が高いサブグループ,ベータブロッカーの使用,冠動脈疾患以外のサブグループでは変動性がより高かったが,抑制の臨床的喪失は高齢患者および心臓機能が低下した患者ではより一般的であった.
結論:
- 有効な抗不律性療法では,不律性の頻度の大幅な変動が起こります.
- 自発的な変動に対する 95% の信頼限界は,単一のホルターテストの慎重な解釈を必要とします.
- アリズム障害の頻度の変化は,特に特定の患者のサブグループでは,治療の失敗に慎重に起因すべきである.
さらに関連する動画
関連する概念動画
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...
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...
Regulation of Heart Rates
The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
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...
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,...

