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Related Concept Videos

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

607
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,...
607
Decreased pulse rate01:14

Decreased pulse rate

747
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...
747
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

355
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...
355
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

289
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...
289
Dysrhythmias I: Introduction01:15

Dysrhythmias I: Introduction

406
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...
406
Myocarditis III: Medical Management01:14

Myocarditis III: Medical Management

95
Myocarditis: Comprehensive Medical ManagementMyocarditis, the heart muscle inflammation, requires a comprehensive medical management strategy that addresses the underlying cause, provides supportive care, manages symptoms, and reduces cardiac workload.Infections and Autoimmune CausesAdminister appropriate antimicrobial therapy when an infectious agent causes myocarditis. For instance, penicillin treats infections caused by Group A Streptococcus. In cases where autoimmune processes are...
95

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Related Experiment Video

Updated: Dec 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 in a Young Patient With COVID-19.

Giuliana Cimino1, Greta Pascariello1, Nicola Bernardi1

  • 1Department of Medical and Surgical Specialties, Institute of Cardiology, University of Brescia, Brescia, Italy.

JACC. Case Reports
|August 25, 2020
PubMed
Summary
This summary is machine-generated.

A COVID-19 patient experienced dangerous heart rhythm issues, specifically prolonged asystole and hypotension. Doctors identified sinus node dysfunction and successfully treated him with a pacemaker.

Area of Science:

  • Critical Care Medicine
  • Cardiology
  • Infectious Diseases

Background:

  • COVID-19 pneumonia can lead to severe complications, including acute lung injury.
Keywords:
COVID-19COVID-19, coronavirus-2019CoV, coronavirusPM, pacemakerSARS-CoV-2, severe acute respiratory syndrome-coronavirus-2SSD, sick sinus dysfunctionbradycardiabradycardia-tachycardia syndromeelectrophysiologysick sinus dysfunctionsinus node dysfunction

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  • Cardiac arrhythmias are a known, albeit less common, manifestation of severe COVID-19.
  • Sinus node dysfunction can present with hemodynamic instability.