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What is the mechanism of tachycardia?
  1. Peter Kabunga1,
  2. Emily Hodkinson1,
  3. Raymond W Sy1,2
  1. 1Department of Cardiology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
  2. 2Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
  1. Correspondence to Dr Raymond W Sy, Department of Cardiology, Royal Prince Alfred Hospital, Camperdown, NSW 2050, Australia; raymond.sy01{at}gmail.com

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CLINICAL INTRODUCTION

A 56-year-old man was referred for an electrophysiology opinion following an unexplained episode of syncope leading to a motor vehicle accident. Routine baseline investigations including an echocardiogram were normal. Following admission, the telemetry strip below was recorded (Figure 1). What is the mechanism of tachycardia?

Figure 1

Telemetry strip.

Question

What is the mechanism of the tachycardia? (Figure 1)

  1. Supraventricular tachycardia (SVT) with aberrancy

  2. Pacing

  3. Antidromic AV re-entry tachycardia

  4. Supraventricular tachycardia with a bystander accessory pathway (AP)

  5. Ventricular tachycardia

For the answer see page 1986

From the question on page 1932

Answer: D

The …

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