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A 65-year-old woman presented to emergency with symptoms of dizziness and palpitations for 1 hour. At presentation, the 12-lead ECG revealed first a left bundle branch block (LBBB) morphology tachycardia followed few minutes later by a right bundle branch block (RBBB) morphology tachycardia (figures 1 and 2). The left ventricle function was normal on 2DECHO.
Contributors All authors have contributed equally to the preparation of this manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.
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