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Related Concept Videos

Electrocardiogram01:29

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...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
Electrocardiogram Fundamentals01:28

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...
ECG Interpretation of Rhythms01:24

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...
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials

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Related Experiment Video

Updated: May 15, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

ECG P wave abnormalities.

Li Ling Tan1, Swee Guan Teo, Kian Keong Poh

  • 1Cardiac Department, National University Heart Centre, Singapore.

Singapore Medical Journal
|January 23, 2013
PubMed
Summary

P wave abnormalities on ECG, like P mitrale and P pulmonale, are often overlooked. Recognizing these ECG findings aids in diagnosing conditions such as mitral valve stenosis and pulmonary hypertension.

Area of Science:

  • Cardiology
  • Electrocardiography
  • Echocardiography

Background:

  • P wave abnormalities on electrocardiograms (ECG) are frequently observed but often underemphasized in clinical interpretation.
  • These subtle ECG findings can indicate significant underlying cardiac conditions.

Purpose of the Study:

  • To highlight two common P wave abnormalities: P mitrale and P pulmonale.
  • To illustrate the association of these abnormalities with specific cardiac pathologies.
  • To emphasize the role of echocardiography in diagnosing the causes of P wave abnormalities.

Main Methods:

  • Case study approach presenting patients with distinct P wave abnormalities.
  • ECG analysis to identify P mitrale and P pulmonale.
  • Echocardiography utilized for etiological investigation.

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Main Results:

  • P mitrale identified in a patient with mitral valve stenosis.
  • P pulmonale identified in a patient with pulmonary hypertension.
  • Echocardiography confirmed the underlying cardiac conditions.

Conclusions:

  • P wave abnormalities, though often neglected, are valuable diagnostic indicators.
  • P mitrale is associated with left atrial enlargement (e.g., mitral valve stenosis).
  • P pulmonale is linked to right atrial enlargement (e.g., pulmonary hypertension).
  • Echocardiography is crucial for confirming the etiology of P wave abnormalities.