• David Donnelly, David Patrick, and Robin A Weir.
• Emergency Department, Hairmyres Hospital, East Kilbride, UK.
• Emerg Med J. 2018 Dec 1; 35 (12): 764-772.

Clinical IntroductionA 17-year-old male patient was brought by ambulance to the ED following a witnessed collapse while playing rugby. He denied any significant trauma, chest pain or breathlessness, and was alert and uncomplaining on arrival, with normal observations and a normal physical exam. Witnesses described a loss of consciousness, with a period of respiratory arrest requiring rescue breaths at the scene. Paramedics reported frequent ventricular extrasystoles on their arrival.The patient had no medical history and was on no medication, although admitted to 'fainting' some 3 weeks previously, again while playing rugby. A paternal uncle had died suddenly at the age of 45.His initial ECG is shown in figure 1.emermed;35/12/764/F1F1F1Figure 1Initial ECG.QuestionWhat is the most likely diagnosis?Pulmonary embolism (PE)Hypertrophic obstructive cardiomyopathy (HOCM)Arrhythmogenic right ventricular cardiomyopathy (ARVC)Right ventricular outflow tract tachycardia (RVOT).© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2018. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

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