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Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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...
675
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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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,...
941
Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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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...
701
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

423
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...
423
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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

711
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...
711
Electrocardiogram01:29

Electrocardiogram

7.1K
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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Updated: Mar 2, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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Low Arrhythmic Risk in Individuals With Brugada ECG Pattern and a Negative dST-Tiso Criterion.

Saverio Iacopino1, Paolo Francesco Sorrenti1, Gennaro Fabiano1

  • 1Arrhythmology Department, Maria Cecilia Hospital, Cotignola, Italy.

The American Journal of Cardiology
|February 28, 2026
PubMed
Summary
This summary is machine-generated.

The dST-Tiso ECG criterion helps predict ventricular arrhythmia (VA) risk in Brugada electrocardiographic pattern (BrECG) patients. A negative dST-Tiso indicates a very low risk of sudden cardiac death or VA events during follow-up.

Keywords:
Brugada syndromedST-Tiso intervaldrug challengerisk stratificationspontaneous type 1 Brugada ECG patternsudden cardiac death

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Diagnostics

Background:

  • Risk stratification for Brugada electrocardiographic pattern (BrECG) patients is clinically challenging.
  • The dST-Tiso ECG criterion, measuring ST-segment elevation duration, predicts ventricular arrhythmia (VA) inducibility.
  • Its association with long-term arrhythmic risk in BrECG requires further assessment.

Purpose of the Study:

  • To evaluate the dST-Tiso ECG criterion's association with arrhythmic events during patient follow-up.
  • To determine if the dST-Tiso criterion can improve risk stratification in BrECG individuals.

Main Methods:

  • Prospective enrollment of consecutive patients with BrECG.
  • Measurement of the dST-Tiso interval during manifest type 1 BrECG.
  • Primary endpoint: composite of sudden cardiac death (SCD) or documented VA (symptomatic or ICD-treated).

Main Results:

  • 11 arrhythmic events (SCD, VA, ICD therapy) occurred over 3.2 years median follow-up.
  • All events happened in patients with a positive dST-Tiso criterion (p < 0.001).
  • A positive dST-Tiso criterion was significantly associated with increased arrhythmic risk (HR 1.02 per ms).

Conclusions:

  • Individuals with BrECG and a negative dST-Tiso criterion exhibit a very low risk of arrhythmic events.
  • The dST-Tiso ECG criterion is a valuable tool for enhancing multiparametric risk stratification in BrECG patients.
  • This marker aids in identifying high-risk individuals needing closer monitoring or intervention.