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Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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...
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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...
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.
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which indirectly block calcium...
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...
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...

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Bradyarrhythmias and conduction blocks.

Julia Vogler1, Günter Breithardt, Lars Eckardt

  • 1Abteilung für Rhythmologie, Department für Kardiologie und Angiologie, Universitätsklinikum Münster, Münster, Germany. Julia.Vogler@ukmuenster.de

Revista Espanola De Cardiologia (English Ed.)
|May 26, 2012
PubMed
Summary
This summary is machine-generated.

Bradyarrhythmias, including sinus node dysfunction and heart block, cause varied symptoms. Diagnosis relies on noninvasive tests, with cardiac pacing as a key treatment for symptomatic cases.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Internal Medicine

Background:

  • Bradyarrhythmias are common, encompassing sinus node dysfunction and atrioventricular conduction disturbances.
  • Symptoms range from asymptomatic findings to syncope, dizziness, and heart failure.
  • Causes are intrinsic or extrinsic, including medications and underlying diseases.

Purpose of the Study:

  • To review the pathophysiology, diagnosis, and treatment of bradyarrhythmias.
  • To focus on sinus node dysfunction and atrioventricular conduction blocks.
  • To emphasize symptom-rhythm correlation in diagnosis.

Main Methods:

  • Noninvasive diagnostic studies: 12-lead ECG, Holter monitoring, exercise testing, event recorders, implantable loop recorders.
  • Invasive electrophysiologic testing is rarely indicated.
  • Ruling out reversible extrinsic causes is crucial.

Main Results:

  • Diagnosis requires correlating symptoms with rhythm disturbances.
  • Cardiac pacing is the primary therapy for symptomatic bradyarrhythmias after excluding reversible causes.
  • Understanding pathophysiology aids in management.

Conclusions:

  • Bradyarrhythmias necessitate accurate diagnosis through noninvasive methods.
  • Symptomatic bradyarrhythmias often require cardiac pacing.
  • Identifying and treating underlying causes is paramount.