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Dysrhythmias III: Characteristics of Dysrhythmias

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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.

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

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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...

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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...

Correlation between ECG and Cardiac Cycle

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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...

Electrocardiogram Fundamentals

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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...

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...

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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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Atrial premature beats with cycle-dependent J waves/ST-segment elevation.

Xing Jie Li¹, Yan Mei Wang

¹Department of Electrocardiogram Room, Jining No.1 People's Hospital, Jining, Shandong, China.

Journal of Cardiovascular Medicine (Hagerstown, Md.)

|June 25, 2026

Summary

This summary is machine-generated.

J waves and ST-segment elevation on ECGs appear with premature atrial beats, linked to short or long-short cardiac cycles. These ECG findings suggest underlying repolarization or depolarization abnormalities.

Keywords:

J waves ST-segment elevation atrial premature beats cycle-dependent J waves/ST-segment elevation

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Area of Science:

Cardiology
Electrophysiology

Background:

J waves and ST-segment elevation are ECG abnormalities.
Their occurrence can be linked to specific cardiac rhythm patterns.

Purpose of the Study:

To analyze the characteristics of J waves and ST-segment elevation.
To investigate the relationship between these ECG findings and cardiac cycle lengths.

Main Methods:

Case study analysis of ECGs.
Observation of J waves and ST-segment elevation in relation to sinus beats and premature atrial beats (APB).

Main Results:

No J waves were seen in sinus beats.
Transient J waves or J point/ST-segment elevation appeared with APB.
ECG findings were dependent on short cardiac cycles or long-short cycle sequences.
Significant J waves/ST-segment elevation occurred in all reported cases.

Conclusions:

Short-cycle-dependent or long-short-cycle sequence-dependent J waves/ST-segment elevation is a notable ECG manifestation.
This ECG pattern may indicate underlying repolarization and/or depolarization abnormalities.