View source for A Narrow QRS Complex Tachycardia Sensitive to Isoptin

{{NHJ|
|mainauthor= '''A.A.M. Wilde, R.H. Bakker'''
|edition= 2006,08:268
}}
[[Image:Puzzle_2006_08_268_fig1.jpg|Figure 1|thumb]]
[[Image:Puzzle_2006_08_268_fig2.jpg|Figure 2|thumb]]

A 54-year-old man presented with palpitations. He
had no other symptoms. Physical examination
revealed, with the exception of a fast regular heart
rhythm (200 beats/min), no abnormalities. His ECG
is shown in figure 1. Intravenous verapamil terminated
the tachycardia and a second ECG (figure 2) was taken.

'''What is your diagnosis?'''

[[Puzzle_2006_08_268 Answer|Answer]]