A narrow QRS tachycardia in a 35-year-old man

The electrocardiogram in Figure  1 is from a 35-year-old man with a history of episodes of rapid heart rhythm during exercise. He came to the hospital after a tachycardia started during a soccer match.
Source: Heart Rhythm - Category: Cardiology Authors: Tags: Josephson and Wellens ECG Lessons: A Monthly Visit to the 12 Lead ECG Source Type: research