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Conduction Disorders in the Setting of Acute STEMI

[ Vol. 17 , Issue. 1 ]

Author(s):

Kjell Nikus*, Yochai Birnbaum, Miquel Fiol-Sala, Jani Rankinen and Antoni Bayés de Luna   Pages 41 - 49 ( 9 )

Abstract:


ST-elevation myocardial (STEMI) is frequently associated with conduction disorders. Regional myocardial ischemia or injury may affect the cardiac conduction system at various locations, and neural reflexes or changes in the balance of the autonomous nervous system may be involved. Sinoatrial and atrioventricular blocks are more frequent in inferior than anterior STEMI, while new left anterior fascicular block and right bundle branch block indicate proximal occlusion of the left anterior descending coronary artery. New left bundle branch block is associated with multi-vessel disease.

Most conduction disorders associated with STEMI are reversible with reperfusion therapy, but they may still impair prognosis because they indicate a large area at risk, extensive myocardial infarction or severe coronary artery disease.

Acute STEMI recognition is possible in patients with a fascicular or right bundle branch block, but future studies need to define the cut-off values for ST depression in the leads V1-V3 in inferolateral MI and for ST elevation in the same leads in anterior STEMI. In the left bundle branch block, concordant ST elevation is a specific sign of acute coronary artery occlusion, but the ECG feature has low sensitivity.

Keywords:

Conduction disorder, acute coronary syndrome, acute myocardial infarction, bundle branch block, atrioventricular block, pacemaker.

Affiliation:

Department of Cardiology, Heart Center, Tampere University Hospital, Tampere and Faculty of Medicine and Health Technology, Tampere University, The Section of Cardiology, Baylor College of Medicine and Texas Heart Institute, Baylor St, Luke Medical Center, Houston, TX, Illes Balears Health Research Institut (IdISBa), and Hospital Son Espases, Palma, Department of Cardiology, Heart Center, Tampere University Hospital, Tampere and Faculty of Medicine and Health Technology, Tampere University, Cardiovascular Research Foundation. Cardiovascular ICCC- Program, Research Institute Hospital de la Santa Creu i Sant Pau, IIB-Sant Pau, Barcelona



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