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Related Concept Videos

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...
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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 minute.
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...
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...
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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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Fetal Mouse Cardiovascular Imaging Using a High-frequency Ultrasound (30/45MHZ) System
07:34

Fetal Mouse Cardiovascular Imaging Using a High-frequency Ultrasound (30/45MHZ) System

Published on: May 5, 2018

Fetal dysrhythmias.

Olus Api1, Julene S Carvalho

  • 1Brompton Fetal Cardiology, Royal Brompton Hospital and Fetal Medicine Unit, St George's Hospital, London, United Kingdom.

Best Practice & Research. Clinical Obstetrics & Gynaecology
|February 5, 2008
PubMed
Summary
This summary is machine-generated.

Fetal cardiac dysrhythmias require intervention for sustained brady- or tachyarrhythmias, but intermittent extrasystoles do not. Advances in fetal echocardiography improve diagnosis and monitoring of these conditions.

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Related Experiment Videos

Last Updated: Jul 7, 2026

Fetal Mouse Cardiovascular Imaging Using a High-frequency Ultrasound (30/45MHZ) System
07:34

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Published on: May 5, 2018

Murine Fetal Echocardiography
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Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction
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Area of Science:

  • Cardiology
  • Fetal Medicine
  • Electrophysiology

Background:

  • Fetal cardiac dysrhythmias range from benign extrasystoles to life-threatening sustained arrhythmias.
  • Accurate diagnosis and monitoring are crucial for effective fetal intervention and management.

Purpose of the Study:

  • To review current understanding and diagnostic approaches to fetal cardiac dysrhythmias.
  • To discuss management strategies for various fetal arrhythmias, including supraventricular and ventricular tachycardias, and bradycardias.

Main Methods:

  • Review of recent advancements in ultrasound methodology and diagnostic tools for fetal cardiac dysrhythmias.
  • Analysis of electrophysiological mechanisms underlying fetal arrhythmias.
  • Discussion of treatment options, including anti-arrhythmic drugs, fetal intervention, and management of heart block.

Main Results:

  • Supraventricular tachycardias, particularly atrioventricular re-entry circuits, are common and require differentiation from other tachyarrhythmias.
  • Sustained tachycardias can lead to fetal heart failure and hydrops fetalis, necessitating prompt treatment.
  • Persistent fetal bradycardias, especially complete heart block, pose significant risks and may be linked to maternal autoantibodies or fetal anomalies.

Conclusions:

  • Improved diagnostic accuracy enhances the understanding and management of fetal cardiac dysrhythmias.
  • Treatment decisions for sustained arrhythmias and heart block are critical for fetal outcomes.
  • The management of immune-mediated heart block remains challenging, with ongoing debate regarding antenatal therapies.