Related Experiment Video
Updated: Mar 6, 2026
09:20
Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
Published on: July 5, 2021
3.7K
Cardiovascular Disease Update: Bradyarrhythmias
Craig Barstow1, Johnathan D McDivitt2
1Womack Army Medical Center, 2817 Reilly Road, Fort Bragg, NC 28310.
FP Essentials
|March 8, 2017
Summary
Bradyarrhythmia, a slow heart rate, can be asymptomatic or cause symptoms like dizziness and fatigue. Treatment ranges from atropine in acute cases to pacemakers for persistent conditions.
Area of Science:
- Cardiology
- Electrophysiology
Background:
- Bradyarrhythmia is defined as a heart rate below 60 beats per minute.
- It can originate from sinus node dysfunction, atrial issues, junctional rhythms, or conduction blocks like atrioventricular block.
- Asymptomatic bradycardia is frequently observed in athletes and during sleep.
Purpose of the Study:
- To review the causes, symptoms, and management strategies for bradyarrhythmia.
- To emphasize the importance of differentiating symptomatic from asymptomatic bradycardia.
- To outline current therapeutic approaches for acute and persistent bradyarrhythmia.
Main Methods:
- Literature review of bradyarrhythmia causes, diagnosis, and treatment.
- Analysis of clinical presentation and diagnostic criteria.
- Evaluation of acute and long-term management options.
Main Results:
- Bradyarrhythmia symptoms include syncope, dizziness, chest pain, dyspnea, and fatigue.
- Acute symptomatic bradyarrhythmia may be treated with atropine or temporary percutaneous pacing.
- Persistent symptomatic bradyarrhythmia, particularly sick sinus syndrome and high-grade AV blocks, necessitates permanent pacemaker implantation.
Conclusions:
- Accurate diagnosis is crucial to determine if bradyarrhythmia is the cause of symptoms.
- Management strategies are tailored to the underlying cause and symptom severity.
- Permanent pacemaker placement is the definitive treatment for persistent, symptomatic bradyarrhythmia.
Related Concept Videos
01:18Dysrhythmias IV: Characteristics of Bradyarrhythmias
698
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...
698
01:14Decreased pulse rate
992
Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
992
01:28Mechanism of Cardiac Arrhythmias
2.5K
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.
2.5K
01:29Disturbances in Heart Rhythm
3.4K
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...
3.4K
01:25Dysrhythmias VI: Management of Dysrhythmias
547
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...
547
01:16ECG Interpretation of Arrhythmias I: Sinus Arrhythmias
969
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
969