View source for Out of the frying pan and into the fire

{{NHJ|
|mainauthor= J.M. van Opstal, C.R. Hoorntje, L.M. Rodriguez
|edition=2004; 5, 234
}}
[[Image:nhj_2004_5_234_fig1.jpg|thumb|Figure 1]]

A 26-year-old pregnant woman was admitted to the emergency heart department with continuous severe palpitations accompanied by chest pain which had started four hours before presentation. She had never had such palpitations before, had no medical history and was not taking any medication. A 12-lead ECG is shown in figure 1. 

'''What is the aetiology of the tachycardia? The paper speed is as usual (25mm/s).''' 

[[Puzzle Out of the Frying Pan and Into the Fire - Answer|Answer]]