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Increased pulse rate01:17

Increased pulse rate

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Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
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Disturbances in Heart Rhythm01:29

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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 heart...
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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...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

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

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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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Related Experiment Video

Updated: May 4, 2026

Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping
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The supraventricular tachycardias.

K Robinson1, D Krikler

  • 1Division of Cardiovascular Disease, Royal Postgraduate Medical School, Hammersmith Hospital, London, United Kingdom.

Annual Review of Medicine
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

Standard electrocardiograms (ECGs) effectively diagnose most supraventricular tachycardias. Understanding the underlying mechanisms through ECGs can guide crucial therapeutic decisions for arrhythmias.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Internal Medicine

Background:

  • Supraventricular tachycardias (SVTs) are common cardiac arrhythmias.
  • Diagnosis often relies on electrocardiography (ECG).
  • Understanding mechanisms impacts treatment strategies.

Purpose of the Study:

  • To review the electrocardiographic features of supraventricular arrhythmias.
  • To correlate ECG findings with underlying electrophysiological mechanisms.
  • To guide therapeutic interventions based on diagnosed arrhythmias.

Main Methods:

  • Analysis of standard 12-lead electrocardiogram (ECG) tracings.
  • Review of ECG characteristics during both arrhythmia and sinus rhythm.
  • Correlation of ECG patterns with known mechanisms of supraventricular tachycardias.

Main Results:

  • Most supraventricular tachycardias are confidently diagnosed with standard 12-lead ECGs.
  • ECG findings often reveal underlying mechanisms like extrasystoles, automatic atrial tachycardias, and reentrant circuits.
  • Availability of sinus rhythm ECGs enhances diagnostic certainty.

Conclusions:

  • Electrocardiography is a powerful tool for diagnosing supraventricular tachycardias.
  • Identifying the specific mechanism of arrhythmia through ECG is key for effective management.
  • Treatment strategies can be tailored based on ECG-determined mechanisms, improving patient outcomes.