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Pulse rhythm01:30

Pulse rhythm

805
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...
805
Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

963
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...
963
Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

923
Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

217
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,...
217
Electrocardiogram01:29

Electrocardiogram

2.3K
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
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Related Experiment Video

Updated: Jul 6, 2025

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function
05:03

Patient Directed Recording of a Bipolar Three-Lead Electrocardiogram using a Smartwatch with ECG Function

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Prolonged mHealth-Based Arrhythmia Monitoring in Patients With Hypertrophic Cardiomyopathy (HCM-PATCH): Protocol for

Sophia Schulze Lammers1,2, Thorsten Lawrenz1, Dennis Lawin1,2

  • 1Department of Cardiology and Intensive Care Medicine, University Hospital Ostwestfalen-Lippe of Bielefeld University, Campus Klinikum Bielefeld, Bielefeld, Germany.

JMIR Research Protocols
|December 29, 2023
PubMed
Summary

Prolonged mobile health (mHealth) monitoring in hypertrophic cardiomyopathy (HCM) patients may detect more arrhythmias than standard ECGs. This could improve sudden cardiac death (SCD) risk identification and guide preventative treatments.

Keywords:
digital medicinehypertrophic cardiomyopathyimplantable cardioverter-defibrillatorlong-term ECGlong-term electrocardiographynonsustained ventricular arrhythmiasudden cardiac death

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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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Published on: December 28, 2012

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Area of Science:

  • Cardiology
  • Medical Technology
  • Clinical Research

Background:

  • Hypertrophic cardiomyopathy (HCM) patients face elevated sudden cardiac death (SCD) risk from arrhythmias.
  • Current screening methods like long-term ECG are limited in routine practice.
  • Intensified monitoring could improve arrhythmia detection and identify more patients for defibrillator implantation.

Purpose of the Study:

  • To compare the prevalence of ventricular arrhythmias in HCM patients using 14-day mHealth monitoring versus standard 24- or 48-hour ECGs.
  • To conduct an intraindividual comparison of arrhythmia frequency over 14 days versus the initial 24-48 hours.

Main Methods:

  • Prospective, single-center cohort study of 34 low- to intermediate-risk HCM patients (HCM Risk-SCD calculator).
  • 14-day continuous rhythm monitoring via ECG patch, integrated with cardiac MRI and genetic data.
  • Patient questionnaires on symptoms, therapy, family history, and monitoring experience.

Main Results:

  • The HCM-PATCH study investigates nonsustained ventricular tachycardia prevalence in HCM patients with prolonged mHealth monitoring.
  • Data collection is ongoing (June 2023-February 2024), with 26 of 34 patients recruited.
  • Results publication is anticipated in Fall 2024.

Conclusions:

  • Prolonged mHealth monitoring may reveal a different arrhythmia prevalence compared to shorter ECGs.
  • This enhanced monitoring could improve risk stratification for HCM patients.
  • Improved identification may lead to timely interventions, reducing SCD and embolic stroke risks.