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Disturbances in Heart Rhythm

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 III: Characteristics of Dysrhythmias

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.

Electrophysiology of Normal Cardiac Rhythm

Electrophysiology of Normal Cardiac Rhythm

The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase of...

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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...

Pulse rhythm

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...

Dysrhythmias I: Introduction

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...

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Related Experiment Video

Updated: Jun 27, 2026

Assessing Intracardiac Vortices with High Frame-Rate Echocardiography-Derived Blood Speckle Imaging in Newborns

Assessing Intracardiac Vortices with High Frame-Rate Echocardiography-Derived Blood Speckle Imaging in Newborns

Published on: December 22, 2023

Accelerated ventricular rhythm in healthy neonates.

Sachdeep S Rehsia¹, Dion Pepelassis, Ilan Buffo-Sequeira

¹London Health Sciences Centre, Children's Hospital of Western Ontario, Division of Paediatric Cardiology, University of Western Ontario, London, Ontario.

Paediatrics & Child Health

|November 26, 2008

Summary

Accelerated ventricular rhythm in neonates is often misdiagnosed as ventricular tachycardia. This condition, however, has a good prognosis and requires accurate diagnosis to avoid unnecessary treatment.

Keywords:

Arrhythmia Health Idioventricular Newborn Tachycardia Treatment

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How to Obtain Reliable Visual Event-related Potentials in Newborns

How to Obtain Reliable Visual Event-related Potentials in Newborns

Published on: October 24, 2019

Area of Science:

Neonatal cardiology
Pediatric electrophysiology
Cardiac arrhythmias

Background:

Accelerated ventricular rhythm (AVR) is a condition that can occur in neonates.
While often benign, it can be mistaken for more serious arrhythmias.
Accurate diagnosis is crucial for appropriate patient management.

Observation:

The study presents a case of a neonate with accelerated ventricular rhythm.
The infant was not correctly diagnosed after birth.
This led to inappropriate medical interventions.

Findings:

Accelerated ventricular rhythm (AVR) presents with a heart rate similar to the original sinus rhythm.
Despite a good prognosis, AVR is frequently misdiagnosed as ventricular tachycardia.
Misdiagnosis can lead to unnecessary and potentially harmful treatments.

Implications:

Emphasizes the need for precise diagnostic criteria for neonatal arrhythmias.
Highlights the importance of distinguishing AVR from ventricular tachycardia to prevent overtreatment.
Suggests improved training or diagnostic protocols for pediatric cardiac centers may be beneficial.