William H Sauer, MD
- Director, Cardiac Electrophysiology
- Brigham and Women's Hospital
Ubar 4 1 1. There are two non-distinct types of second-degree AV block, called Type 1 and Type 2.In both types, a P wave is blocked from initiating a QRS complex; but, in Type 1, there are increasing delays in each cycle before the omission, whereas, in Type 2, there is no such pattern. Type 1 second-degree heart block is considered a more benign entity than type 2 second-degree heart block with.
- Doctors group heart block into categories based on how severe it is. This is the mildest form of heart block. The heart's electrical signal is slowed but still gets where it's going.
- The heart is composed of three specialized cells: 1) pacemaker cells; 2) Purkinje cells; and 3) contractile cells. 1 Pacemaker cells have a property called automaticity; they undergo spontaneous.
Leonard I Ganz, MD, FHRS, FACC Jixipix rainy daze 1 22 full.
- Section Editor — Cardiac Arrhythmias
- Director of Cardiac Electrophysiology
- Heritage Valley Health System
2 1 Heart Block
Gordon M Saperia, MD
- Senior Deputy Editor — UpToDate
- Deputy Editor — Cardiovascular Medicine
INTRODUCTION
Atrioventricular (AV) block is defined as a delay or interruption in the transmission of an impulse from the atria to the ventricles due to an anatomical or functional impairment in the conduction system. The conduction disturbance can be transient or permanent, with conduction that is delayed, intermittent, or absent. Commonly used terminology includes:
●First degree AV block – Slowed conduction without missed beats.
●Second degree AV block – Missed beats, often in a regular pattern (eg, 2:1, 3:2), or higher degrees of block, which is further classified into Mobitz type I (Wenkebach) and Mobitz II AV block.
●Third degree (complete AV) block – No atrial impulses reach the ventricle.
●High-grade AV block – Two or more consecutive blocked P waves.
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- Peuch P, Grolleau R, Guimond C. Incidence of different types of A-V block and their localization by His bundle recordings. In: The Conduction System of the Heart, Wellens HJJ, Lie KI, Janse MJ (Eds), Stenfert Kroese, Leiden 1976. p.467.
- Narula OS. Current concepts of atrioventricular block. In: His Bundle Electrocardiography and Clinical Electrophysiology, Narula OS (Ed), Davis, Philadelphia 1975. p.139.
