Key result
A patient with acute myocardial infarction presented with the rare coexistence of both tachycardia-dependent (phase-3) and bradycardia-dependent (phase-4) bundle branch blocks.
Case Report (n=1)
This case report highlights the rare coexistence of both phase-3 and phase-4 bundle branch blocks in a single patient.
Alerts clinicians to dual phase-3/phase-4 BBB in AMI; case report leaves open questions on prevalence and mechanisms.
Rate-dependent bundle branch blocks are often related with increased heart rate(tachycardia-dependent or phase-3 bundle branch block). Less often, they arecaused by heart rate reduction (bradycardia-dependent or phase-4 bundle branchblock). Phase-3 block is the most common type of paroxysmal intraventricularconduction disturbances documented in several publications. However, few articlesdescribe phase-4 bundle branch block, and both mechanisms rarely coexist in thesame patient. We report the case of a patient admitted with acute myocardialinfarction, presenting with both tachycardia- and bradycardia-dependentparoxysmal intraventricular conduction disturbances.
No takes yet. Share an insight, caveat, or question.
Román et al. (2013) conducted a case report in Acute myocardial infarction with rate-dependent bundle branch block (n=1). Heart rate changes (tachycardia and bradycardia) was evaluated. A patient with acute myocardial infarction presented with the rare coexistence of both tachycardia-dependent (phase-3) and bradycardia-dependent (phase-4) bundle branch blocks.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: