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Electrocardiogram

Electrocardiogram

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 the T...

Electrocardiogram Fundamentals

Electrocardiogram Fundamentals

Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...

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...

Holter Monitor: 24-Hour Monitoring

Holter Monitor: 24-Hour Monitoring

Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...

Dysrhythmias V: Evaluating Dysrhythmias

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...

ECG Interpretation of Rhythms

ECG Interpretation of Rhythms

An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage. When...

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Related Experiment Video

Updated: Jul 20, 2026

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

Status of computerized electrocardiography.

Richard H Hongo¹, Nora Goldschlager

¹Division of Cardiology, California Pacific Medical Center, 2100 Webster Street, Suite 516, San Francisco, CA 94115, USA. rhongo@cpcmg.com

Cardiology Clinics

|August 31, 2006

Summary

Computerized electrocardiogram (ECG) analysis has advanced significantly, but misinterpretations persist, particularly in rhythm diagnoses and pacemaker activity. Physicians must understand these limitations, using computer interpretations as a supplement, not a replacement, for expert medical judgment.

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Published on: December 28, 2012

Area of Science:

Cardiology
Medical Informatics
Biomedical Engineering

Background:

Computerized electrocardiogram (ECG) analysis has evolved substantially since the 1960s.
Current technology provides computer interpretations for most ECGs in the United States.
Despite advancements, ECG misinterpretation remains a concern, impacting patient care.

Purpose of the Study:

To highlight the advancements in computerized ECG analysis.
To underscore the persistent challenges and limitations of current computer interpretation programs.
To emphasize the essential role of physician expertise in ECG interpretation.

Main Methods:

Review of the historical development and current state of computerized ECG analysis.
Analysis of common errors in computer-generated ECG interpretations, focusing on rhythm and pacemaker activity.
Discussion of the implications for clinical practice and patient management.

Main Results:

Computerized ECG analysis is widespread but not infallible.
Rhythm diagnoses and identification of pacemaker activity are areas prone to computer misinterpretation.
Over-reliance on automated analysis can lead to inappropriate patient management.

Conclusions:

A thorough understanding of the strengths and limitations of computerized ECG analysis is crucial for clinicians.
Computerized interpretations should be considered an adjunct to, rather than a substitute for, expert physician interpretation.
The future reliability of automated ECG analysis requires ongoing evaluation and expert oversight.