Conduction Defects
- Overview of atrioventricular (AV) blocksThis article covers the fundamental principles of atrioventricular AV blocks, which are classified into three types: first-degree, second-degree, and…
- First-degree AV block (AV block I, AV block 1)This chapter discusses first-degree atrioventricular AV block, also referred to as 1st-degree AV block, AV block I, or AV block 1. Before proceeding, it is…
- Second-degree AV block: Mobitz type 1 (Wenckebach) & Mobitz type 2 blockIn this chapter, the focus will be on second-degree atrioventricular AV block. Before proceeding, it is advised to review the introductory chapter on AV…
- Third-degree AV block (3rd degree AV block, AV block 3, AV block III)This chapter discusses third-degree AV block, which is synonymous with AV dissociation, complete AV block, AV block III and AV block 3. In third-degree AV…
- Management and treatment of AV block (atrioventricular blocks)Evaluation of patients with suspected AV blocks requires a thorough medical history with emphasis on causes of AV blocks; please refer to the Causes of AV…
- Intraventricular conduction delay: bundle branch blocks & fascicular blocksThis chapter discusses intraventricular conduction delays defects, which are caused by functional or anatomical defects in the components of the…
- Right bundle branch block (RBBB): ECG, criteria, definitions, causes & treatmentRight bundle branch block RBBB is due to an anatomical or functional dysfunction in the right bundle branch, such that the electrical impulse is blocked.…
- Left bundle branch block (LBBB): ECG criteria, causes, managementLeft bundle branch block LBBB results from anatomical or functional impairment of the left bundle branch LBB, leading to a blockage of electrical impulse…
- Left bundle branch block (LBBB) in acute myocardial infarction: the Sgarbossa criteriaContrary to right bundle branch block, left bundle branch block is always a pathological finding that affects cardiovascular and total mortality. Left…
- Fascicular block (hemiblock): Left anterior & left posterior fascicular blockFascicular blocks were previously referred to as hemiblocks, but the latter term has been deprecated. The left bundle branch is subdivided into the…
- Nonspecific intraventricular conduction delay (defect)A nonspecific intraventricular conduction delay exists if the ECG displays a widened QRS appearance that is neither a left bundle branch block…
STEMI (ST Elevation Myocardial Infarction): Diagnosis, ECG, Criteria, and Management
Acute ST Elevation Myocardial Infarction STEMI is the most severe manifestation of coronary artery disease. This chapter deals with the pathophysiology,…
Overview of atrioventricular (AV) blocks
This article covers the fundamental principles of atrioventricular AV blocks, which are classified into three types: first-degree, second-degree, and…