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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...
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Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
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Mitral Regurgitation I: Introduction01:20

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Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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Mitral Stenosis II: Clinical features and Diagnostic Tests01:23

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Mitral stenosis is a heart condition in which the mitral valve, which allows blood to flow from the left atrium to the left ventricle, becomes narrowed or stenotic. This narrowing hinders blood flow and leads to clinical symptoms requiring specific medical evaluations and management strategies. The following overview outlines the clinical symptoms, assessments, diagnostic findings, prevention methods, and treatments for mitral stenosis.Clinical ManifestationsDyspnea (shortness of breath): This...
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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.
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Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

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Aortic valve regurgitation (AR) occurs when the aortic valve fails to close properly, allowing blood to flow backward from the aorta into the left ventricle. This backflow can result in two distinct clinical presentations: acute and chronic AR, each characterized by its own set of symptoms and physical findings.Acute Aortic RegurgitationAcute AR presents with a sudden onset of severe symptoms. Patients typically experience profound dyspnea (shortness of breath), chest pain, and signs of left...
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Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
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Wenckebach Phenomenon in Left Bundle Branch Block.

Masood Akhtar1

  • 1Aurora Cardiovascular Services, Aurora Sinai/Aurora St. Luke's Medical Centers, University of Wisconsin School of Medicine and Public Health, 2801 West Kinnickinnic River Parkway, Suite 777, Milwaukee, WI 53215, USA.

Cardiac Electrophysiology Clinics
|November 14, 2016
PubMed
Summary

A 60-year-old patient experienced recurrent wide QRS complex tachycardia, identified as atrioventricular nodal reentry tachycardia. This condition, despite causing palpitations, did not present with other symptoms or abnormal cardiovascular findings.

Keywords:
ElectrocardiogramLeft bundle branch blockTachycardiaWenckebach phenomenon

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Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Recurrent wide QRS complex tachycardia can present with various underlying mechanisms.
  • Left bundle branch block patterns and normal axis necessitate differential diagnosis.

Observation:

  • A 60-year-old patient presented with recurrent episodes of wide QRS complex tachycardia.
  • The electrocardiographic pattern showed a left bundle branch morphology with a normal electrical axis.
  • The patient reported palpitations as the sole symptom, with a normal cardiovascular examination.

Findings:

  • The diagnosed mechanism of tachycardia was atrioventricular nodal reentry tachycardia (AVNRT).
  • AVNRT, typically associated with narrow QRS complexes, presented atypically with wide QRS morphology in this case.
  • The absence of other symptoms and normal cardiovascular findings highlight the specific presentation.

Implications:

  • This case underscores the importance of considering AVNRT even in the presence of wide QRS complexes, particularly with left bundle branch block morphology.
  • Understanding atypical presentations of AVNRT is crucial for accurate diagnosis and effective management of supraventricular tachycardias.
  • Further research into the electrophysiological substrates leading to wide QRS in AVNRT may refine diagnostic criteria and treatment strategies.