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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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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...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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...
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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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...
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Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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動脈動症患者のコホートにおける報告された脳卒中率の大きな差異

Gene R Quinn1, Olivia N Severdija1, Yuchiao Chang1

  • 1From Smith Center for Outcomes Research, Division of Cardiology (G.R.Q.), and Department of Medicine (O.N.S.), Beth Israel Deaconess Medical Center, Boston, MA; Harvard Medical School, Boston, MA (G.R.Q., O.N.S., Y.C., D.E.S.); and Division of General Internal Medicine, Massachusetts General Hospital, Boston (Y.C., D.E.S.).

Circulation
|November 2, 2016
PubMed
まとめ

心房細動患者における脳卒中率は著しく変化し,経口抗凝固剤の推奨に影響を与えています. CHA2DS2- VAScのスコアが低い多くのAF患者は,脳卒中のリスクが低いため,抗凝固薬の恩恵を受けない可能性があります.

キーワード:
CHA2DS2-VASc について抗凝固剤心房細動出血のリスクウォルファリン

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Last Updated: Mar 12, 2026

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28:13

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科学分野:

  • 心臓病科
  • 神経学
  • 薬理学について

背景:

  • 口服抗凝固剤は,心房細動 (AF) の脳卒中リスクを低減するが,出血を増加させる.
  • 抗凝固剤の純臨床効果は,脳卒中のリスクが出血リスク (通常は年間1~2%) を上回った場合に達成される.
  • CHA2DS2- VAScスコアは,固定された脳卒中率を想定して,抗凝固剤の推奨を導く.

研究 の 目的:

  • AF患者の報告された脳卒中率を評価する.
  • 異なる集団における脳卒中リスクスコアと実際の脳卒中率の関係を調べる

主な方法:

  • 34のコホート研究とランダム化制御試験の体系的レビュー
  • 口服抗凝固剤を服用していない非バルブ性AF患者も含まれていた.

主要な成果:

  • 脳卒中の発生率は研究によって非常に異質 (年間0. 45% - 9. 28%) であった.
  • 平均脳卒中率は北米とヨーロッパで大きく違いました
  • CHA2DS2- VAScスコアは1または2で,多くのコホートでは,脳卒中率は,純臨床効果の1〜2%の値を下回っていると報告されました.

結論:

  • 類似のCHA2DS2- VAScスコアであっても,AF患者における脳卒中の割合には大きな変動がある.
  • この多様性は,口服用抗凝固剤の使用に関する現在のガイドラインに異議を唱える.
  • CHA2DS2- VAScスコアが1または2である多くのAF患者は,抗凝固薬による明確な臨床的利益を経験しない可能性があります.