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A regularly irregular tachycardia with variable QRS morphologies - What is the mechanism?
Margulescu, AndreiD; Thomas, Dewi E; Barry, James P.
Affiliation
  • Margulescu A; Department of Cardiology, Morriston Regional Cardiac Centre, Morriston Hospital, Swansea SA6 6NL, UK. Electronic address: andrei.margulescu@wales.nhs.uk.
  • Thomas DE; Department of Cardiology, Morriston Regional Cardiac Centre, Morriston Hospital, Swansea SA6 6NL, UK. Electronic address: dewi.thomas@wales.nhs.uk.
  • Barry JP; Department of Cardiology, Morriston Regional Cardiac Centre, Morriston Hospital, Swansea SA6 6NL, UK. Electronic address: james.barry@wales.nhs.uk.
J Electrocardiol ; 65: 146-150, 2021.
Article in En | MEDLINE | ID: mdl-33621799
ABSTRACT
We present a complex ECG displaying a combination of atrial tachycardia with Mobitz type I AV block, and right bundle branch block (RBBB) alternans (RBBB alternating with normal QRS conduction) during Wenckebach cycle. A detailed explanation regarding the mechanism of this complex arrhythmia is provided, and the mechanism of bundle branch alternans is reviewed. A unique feature of our case is the added complexity given by the presence of atrial tachycardia and AV Wenckebach, which departs from the previous description of bundle branch alternans during 11 AV conduction.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Electrocardiography / Atrioventricular Block Type of study: Diagnostic_studies Limits: Humans Language: En Journal: J Electrocardiol Year: 2021 Document type: Article
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Electrocardiography / Atrioventricular Block Type of study: Diagnostic_studies Limits: Humans Language: En Journal: J Electrocardiol Year: 2021 Document type: Article