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Dysrhythmias II: Classification of Tachyarrhythmias

Dysrhythmias II: Classification of Tachyarrhythmias

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...

Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias III: Characteristics of Dysrhythmias

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.

Increased pulse rate

Increased pulse rate

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...

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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...

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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, and...

Myocarditis II: Clinical Features and Diagnostic Tests

Myocarditis II: Clinical Features and Diagnostic Tests

Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...

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Related Experiment Video

Updated: Jun 26, 2026

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

Published on: February 17, 2018

Asymptomatic wide complex tachycardia: a case report.

Siddharth Mukerji¹, Feras Aloka, Atul Khasnis

¹Department of Internal Medicine, Michigan State University, East Lansing, Michigan, USA. khasatul@yahoo.com.

|January 16, 2009

Summary

Recognizing and treating wide complex tachycardias is crucial for patient survival. This case highlights a patient with cardiomyopathy who developed tachycardia after receiving an implantable cardioverter-defibrillator.

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Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

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Published on: February 17, 2018

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

Analyzing Long-Term Electrocardiography Recordings to Detect Arrhythmias in Mice

Published on: May 23, 2021

Area of Science:

Cardiology
Electrophysiology
Critical Care Medicine

Background:

Wide complex tachycardias (WCTs) are common in critical care settings.
These arrhythmias pose a significant risk of mortality if not promptly identified and managed.
Physical signs can aid in the diagnosis of WCTs.

Purpose of the Study:

To present a clinical case of a patient experiencing tachycardia.
To discuss the diagnostic and management considerations for WCTs in a patient with an implantable cardioverter-defibrillator (ICD).

Main Methods:

Case report presentation.
Review of clinical presentation and patient history.
Discussion of diagnostic approaches for tachycardia in the context of cardiomyopathy and ICD.

Main Results:

A 54-year-old female with cardiomyopathy developed tachycardia post-ICD implantation.
The case underscores the importance of recognizing WCTs in patients with cardiac devices.

Conclusions:

Prompt recognition and appropriate treatment of wide complex tachycardias are essential for improving outcomes.
Clinical vigilance is necessary for managing arrhythmias in patients with implantable cardioverter-defibrillators.