Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Dysrhythmias II: Classification of Tachyarrhythmias

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...

Increased pulse rate

Increased pulse rate

Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...

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.

Cardiovascular System Abnormal Findings I: Inspection and Palpation

Cardiovascular System Abnormal Findings I: Inspection and Palpation

In a cardiovascular examination, inspection and palpation are crucial for identifying abnormalities.
Abnormal findings observed during an inspection

Decreased pulse rate

Decreased pulse rate

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 bradycardia...

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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Human bone marrow-derived adult stem cells for post-myocardial infarction cardiac repair: current status and future directions.

Singapore medical journal·2009

Same author

Electrocardiographical case. Young woman with epilepsy.

Singapore medical journal·2007

Same author

Electrocardiographical case. A young man with chest pain.

Singapore medical journal·2006

Same author

Echocardiographic advances in atrial fibrillation and supraventricular arrhythmias.

Minerva cardioangiologica·2005

Same author

Catheter ablation for atrial fibrillation.

Heart (British Cardiac Society)·2004

Same author

Mapping and ablation of ventricular fibrillation.

Minerva cardioangiologica·2004

Search research articles

Related Experiment Video

Updated: Jun 2, 2026

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

Published on: February 17, 2018

Palpitations and narrow-complex tachycardia.

J K B Tan¹, K W Q Guo, L F Hsu

¹Department of Cardiology, National Heart Centre Singapore, 17 Third Hospital Avenue, Mistri Wing, Singapore 188752. jaetee@yahoo.com

Singapore Medical Journal

|May 10, 2011

Summary

This summary is machine-generated.

Parkinson's disease tremors can mimic cardiac arrhythmias on electrocardiograms. Differentiating these myopotentials from true QRS complexes is crucial for accurate diagnosis in patients with movement disorders.

More Related Videos

Echocardiographic Assessment Using Subxiphoid-Only Examination for Hypotensive Patients

Echocardiographic Assessment Using Subxiphoid-Only Examination for Hypotensive Patients

Published on: April 18, 2025

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

Related Experiment Videos

Last Updated: Jun 2, 2026

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

Published on: February 17, 2018

Echocardiographic Assessment Using Subxiphoid-Only Examination for Hypotensive Patients

Echocardiographic Assessment Using Subxiphoid-Only Examination for Hypotensive Patients

Published on: April 18, 2025

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

Area of Science:

Cardiology
Neurology
Medical Diagnostics

Background:

A 56-year-old patient with Parkinson's disease (PD) presented with palpitations.
Electrocardiogram (ECG) revealed an irregular narrow-complex tachycardia.

Observation:

A discrepancy in ventricular rate was noted between limb and precordial leads.
This rate difference was attributed to myopotentials from the patient's tremors.

Findings:

Myopotentials mimicked QRS complexes in the limb leads, simulating a cardiac arrhythmia.
Myopotentials are characterized by variable amplitude and tremor-like frequency, distinguishing them from true QRS complexes.

Implications:

Accurate differentiation of myopotentials from QRS complexes is vital for diagnosing cardiac conditions in PD patients.
This distinction prevents misdiagnosis of supraventricular tachycardias and guides appropriate patient management.