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Related Concept Videos

Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
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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...
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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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

696
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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Decreased pulse rate01:14

Decreased pulse rate

971
Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
971
Dysrhythmias VII: Nursing Management of Dysrhythmias01:25

Dysrhythmias VII: Nursing Management of Dysrhythmias

460
Nursing management of dysrhythmias involves the following:AssessmentSubjective Assessment:The initial step involves gathering patient-reported symptoms such as dizziness, palpitations, and chest discomfort. It is crucial to collect a detailed history, including previous heart conditions, current medication use, and lifestyle factors like caffeine and alcohol consumption.Objective Assessment:This involves observing clinical signs such as jugular venous distention, cool and pale skin, and...
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Don't forget the memory: Contribution of the T wave vector in localizing the site of origin of a monomorphic idiopathic ventricular tachycardia.

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Radiofrequency Ablation Versus Antiarrhythmic Drug Therapy for Atrial Fibrillation: Meta-Analysis of Quality of Life, Morbidity, and Mortality.

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Substrate Mapping for Ventricular Tachycardia: Assumptions and Misconceptions.

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Anticoagulation for Cardioversion of Acute Onset Atrial Fibrillation: Time to Revise Guidelines?

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Related Experiment Video

Updated: Feb 25, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Bypass Tract in Patient with Palpitations.

Mark E Josephson1

  • 1Cardiovascular Division, Beth Israel Deaconess Medical Center, 185 Pilgrim Road, West Baker 4, Boston, MA 02215, USA.

Cardiac Electrophysiology Clinics
|August 4, 2017
PubMed
Summary

Multiple bypass tracts occur in Wolff-Parkinson-White syndrome. A case study revealed two left-sided bypass tracts, confirmed by mismatched atrial and ventricular activation in a patient with a 15-year history of palpitations.

Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Multiple bypass tracts are a known, though not uncommon, finding in Wolff-Parkinson-White syndrome.
  • These accessory pathways can be present in 5% to 15% of affected patients.

Purpose of the Study:

  • To present a case study of a patient diagnosed with multiple bypass tracts.
  • To illustrate the diagnostic process and findings in a complex case of Wolff-Parkinson-White syndrome.

Main Methods:

  • Clinical case presentation.
  • Analysis of electrocardiogram (ECG) findings, specifically noting the mismatch in atrial and ventricular activation patterns.

Main Results:

  • The patient had a 15-year history of recurrent palpitations.
  • Diagnostic evaluation confirmed the presence of two distinct left-sided bypass tracts.

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  • A mismatch between atrial and ventricular activation was key in identifying the accessory pathways.

    • Conclusions:

    • This case highlights the importance of considering multiple bypass tracts in patients with Wolff-Parkinson-White syndrome.
    • Accurate identification of accessory pathways is crucial for effective management and treatment of arrhythmias.