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Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

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.
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
Disturbances in Heart Rhythm01:29

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...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

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...
Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...

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Related Experiment Videos

Exploring the Association Between Mental Disorders and Various Arrhythmias via Mendelian Randomization Methods.

Jingyang Su1, Jialin Zhang2, Yueyue Ding3

  • 1Department of General Internal Medicine, Tongde Hospital Affiliated to Zhejiang Chinese Medical University (Tongde Hospital of Zhejiang Province), Hangzhou, China.

Genes, Brain, and Behavior
|June 18, 2026
PubMed
Summary

Major depression significantly increases the risk of arrhythmias like atrial fibrillation and tachycardia. This study also found a potential bidirectional link between depression and atrioventricular block, highlighting genetic associations.

Keywords:
arrhythmiasbipolar disordermajor depressionschizophrenia

Related Experiment Videos

Area of Science:

  • Cardiovascular Genetics
  • Psychiatric Genetics
  • Epidemiology

Background:

  • Mental disorders like major depression, bipolar disorder, and schizophrenia are prevalent.
  • A potential association between these mental illnesses and cardiac arrhythmias is of significant clinical interest.

Purpose of the Study:

  • To investigate the potential causal relationship between major depression, bipolar disorder, schizophrenia, and arrhythmias.
  • To explore bidirectional causal effects between mental disorders and arrhythmias using genetic data.

Main Methods:

  • Conducted a bidirectional two-sample Mendelian randomization (MR) analysis.
  • Utilized publicly available Genome-Wide Association Studies (GWAS) summary statistics.
  • Employed inverse-variance weighted (IVW) method with MR-Egger and weighted median estimator for sensitivity analyses.

Main Results:

  • Genetic predisposition to major depression showed increased risk for atrial fibrillation/flutter (OR=1.214), paroxysmal tachycardia (OR=1.493), and atrioventricular block (OR=1.257).
  • Reverse MR indicated a modest causal effect of atrioventricular block on depression risk (OR=1.045).

Conclusions:

  • The study supports a causal role of major depression in elevating the risk of specific arrhythmias.
  • Evidence suggests potential bidirectional causal effects between depression and atrioventricular block from a genetic liability perspective.