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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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β-adrenergic antagonists, commonly known as β-blockers, block the effects of sympathetic neurotransmitters such as noradrenaline (NA) and adrenaline (ADR). They have several beneficial effects in heart failure treatment. They reduce heart rate, the force of contraction, and cardiac muscle relaxation. They also slow the atrial-ventricular conduction rate and raise the threshold for arrhythmias. The concentration of β-blockers determines their effects on bronchodilation,...
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Dysrhythmias refers to abnormalities in the heart's rhythm. They result from disruptions in the heart's electrical conduction system, which includes the sinoatrial(SA)node, atrioventricular(AV) node, the bundle of His, bundle branches, and Purkinje fibers.Definition and PathophysiologyDysrhythmias result from disorders of impulse formation, impulse conduction, or both. The heart contains specialized cells in the sinoatrial node, atrioventricular node, and the bundle of His and Purkinje fibers...
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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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Bilateral Bundle Branch Block.

Jasen L Gilge1, Benzy J Padanilam1

  • 1St Vincent Hospital, 8333 Naab Road, Suite 400, Indianapolis, IN 46260, USA.

Cardiology Clinics
|June 15, 2023
PubMed
Summary

Bilateral bundle branch block (BBBB) is an uncommon heart condition combining features of left and right bundle branch blocks. This underrecognized disorder may increase cardiovascular risks and benefit from cardiac resynchronization therapy.

Keywords:
Bilateral bundle branch blockBundle branch blockConduction system disorderLeft bundle branch blockRight bundle branch block

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Conduction

Background:

  • Left bundle branch block (LBBB) and right bundle branch block (RBBB) are well-established conduction abnormalities.
  • A less common, underrecognized condition, bilateral bundle branch block (BBBB), may present with features of both LBBB and RBBB.

Purpose of the Study:

  • To describe the characteristics and potential implications of bilateral bundle branch block (BBBB).
  • To investigate the association of BBBB with adverse cardiovascular events and response to therapy.

Main Methods:

  • Analysis of electrocardiographic (ECG) patterns to identify BBBB.
  • Review of clinical data for patients with identified BBBB.

Main Results:

  • Bilateral bundle branch block (BBBB) is characterized by an RBBB pattern in lead V1 and an LBBB pattern in leads I and aVL.
  • This unique conduction disorder is associated with an increased risk of adverse cardiovascular events.

Conclusions:

  • Bilateral bundle branch block (BBBB) represents a distinct entity within bundle branch conduction disorders.
  • Patients with BBBB may represent a specific subgroup that could benefit from cardiac resynchronization therapy.