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Bradycardia and Pacemakers/CRT

  • Gaurav A. Upadhyay
  • Jagmeet P. Singh
Chapter

Abstract

Bradyarrhythmias are a heterogeneous group of cardiac rhythm disturbances which are implicated in over 40 % of sudden cardiac deaths in the hospital. Broadly classified, they are manifestations of either a failure of cardiac impulse generation or impulse propagation. They may be physiologic and benign, as in sinus bradycardia and sinus arrhythmia in athletes, or pathologic and warranting intervention, as in compromising bradycardia from sinus node dysfunction or ventricular asystole from high-grade atrioventricular (AV) block after an anterior myocardial infarction (MI).

The purpose of this chapter is to review the pathophysiology of various bradyarrhythmias and to review treatment options available. In addition, a brief overview of pacemakers and cardiac resynchronization therapy (CRT) will be provided.

Keywords

Cardiac Resynchronization Therapy Respiratory Sinus Arrhythmia Transcatheter Aortic Valve Replacement Sinus Bradycardia Complete Heart Block 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

ACC

American College of Cardiology

AF

Atrial fibrillation

AHA

American Heart Association

AV

Atrioventricular

BPEG

British Pacing Electrophysiology Group

bpm

Beats per minute

CHB

Complete heart block

CL

Cycle length

CRT

Cardiac resynchronization therapy

cSNRT

Corrected sinoatrial node recovery time

ECG

Electrocardiogram

EP

Electrophysiologic

FDA

Food and Drug Administration

HCM

Hypertrophic cardiomyopathy

HF

Heart failure

HR

Heart rate

HRS

Heart Rhythm Society

ICD

Implantable cardioverter defibrillator

LAFB

Left anterior fascicular block

LBBB

Left bundle branch block

LPFB

Left posterior fascicular block

LQT1

Long QT syndrome type 1

LV

Left ventricular

LVEF

Left ventricular Ejection fraction

MI

Myocardial infarction

NASPE

North American Society for Pacing and Electro­physiology

NYHA

New York Heart Association

PPM

Permanent pacemakers

RA

Right atrium

RBBB

Right bundle branch block

RV

Right ventricle

SA

Sinoatrial

SACT

Sinoatrial conduction time

SND

Sinus node dysfunction

SNRT

Sinoatrial node recovery time

VT

Ventricular tachycardia

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Copyright information

© Springer-Verlag London 2014

Authors and Affiliations

  • Gaurav A. Upadhyay
    • 1
  • Jagmeet P. Singh
    • 2
  1. 1.Harvard Medical School Cardiology Division, Department of MedicineMassachusetts General HospitalBostonUSA
  2. 2.Harvard Medical School Cardiac Arrhythmia Service, Cardiology Division, Department of MedicineMassachusetts General HospitalBostonUSA

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