Second-degree atrioventricular block

Second-degree atrioventricular block
Other namesSecond-degree heart block
ECGs demonstrating forms of second-degree AV block
SpecialtyCardiology
SymptomsDizziness, Fainting, Shortness of breath
TypesType 1 (Wenckebach), Type 2
CausesFibrosis in AV node, medication, vagal tone, electrolyte disturbances
Diagnostic methodElectrocardiogram
TreatmentAvoidance of AV-nodal-blocking medication, pacemaker

Second-degree atrioventricular block (AV block) is a disease of the electrical conduction system of the heart. It is a conduction block between the atria and ventricles. The presence of second-degree AV block is diagnosed when one or more (but not all) of the atrial impulses fail to conduct to the ventricles due to impaired conduction. It is classified as a block of the AV node, falling between first-degree (slowed conduction) and third degree blocks (complete block).[1]

  1. ^ Mangi MA, Jones WM, Mansour MK, Napier L (2022). "Atrioventricular Block Second-Degree". National Center for Biotechnology Information, U.S. National Library of Medicine. PMID 29493981. Retrieved 3 July 2021.