Case 1: A fifty-year-old male with a history of single-chamber (AAIR) pacemaker implantation for symptomatic sick sinus syndrome presented to the pacemaker clinic experiencing multiple episodes of dizziness. An electrocardiogram was taken(see the image). What is the most probable underlying diagnosis and probable aetiology?? Figure 1. 12-lead electrocardiogram of the index patient. Answer will be posted on the last week of June Case courtesy: Dr Sudipta Mondal, SCTIMST, Trivandrum

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