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Related Concept Videos

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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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,...
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Decreased pulse rate01:14

Decreased pulse rate

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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...
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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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Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

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Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...
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Mitral Stenosis IV: Nursing Management01:27

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A comprehensive nursing assessment is essential for patients with valvular heart disease, which involves any dysfunction of the heart valves that could impact blood flow and overall heart function.Subjective Data Collection:Chief Complaint and Present Illness: Start with the patient's primary concerns, focusing on the onset, duration, and progression of cardiac symptoms such as dyspnea, fatigue, chest pain, and palpitations.Past Medical History: Collect detailed information on any previous...
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Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

13
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 Video

Updated: Jul 11, 2025

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
09:20

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Sinus node dysfunction and stroke risk: a systematic review and meta-analysis.

Haoyu Dong1, Hao Chen1, Tesfaldet Habtemariam Hidru1

  • 1Department of Cardiology, First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China.

BMJ Open
|November 17, 2023
PubMed
Summary
This summary is machine-generated.

Patients with sinus node dysfunction (SND) face a similar stroke risk whether or not they have atrial fibrillation (AF). This highlights the need for stroke prevention strategies in all SND patients.

Keywords:
anticoagulationmeta-analysisrisk factorssinus node dysfunctionstroke

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Area of Science:

  • Cardiology
  • Neurology
  • Clinical Research

Background:

  • The stroke risk associated with cardiac arrhythmia, particularly atrial fibrillation (AF), is well-established.
  • However, the specific stroke risk in patients with sinus node dysfunction (SND), with or without co-existing AF, remains unclear.
  • This study addresses this gap by comparing stroke risk in these patient groups.

Approach:

  • A systematic review and meta-analysis was conducted using the Grading of Recommendations, Assessment, Development and Evaluation (GRADE) approach.
  • Searches were performed across PubMed, EMBASE, and Cochrane databases up to December 2022.
  • Included studies focused on stroke incidence in patients diagnosed with SND, both with and without AF/atrial flutter.

Key Points:

  • Analysis of 6 papers involving 106,163 patients revealed an average yearly stroke incidence of 1.542% in the SND population.
  • Stroke incidence was comparable between isolated SND (1.587%) and SND with AF (1.660%).
  • Factors associated with increased stroke risk in SND patients included AF, prior thrombotic events, hypertension, and heart failure.

Conclusions:

  • Patients with SND exhibit a similar stroke risk, irrespective of the presence or absence of atrial fibrillation.
  • These findings underscore the importance of considering stroke prevention measures for all individuals with SND.
  • Further research is warranted to evaluate the efficacy of interventions like anticoagulation therapy for stroke prevention in the SND population.