A narrow QRS tachycardia easily provoked by exercise during sinus rhythm

A 15-year-old boy was referred to our outpatient clinic for the evaluation of palpitations. They started 2 years ago, happening daily after light exercise. When exercise was continued, he noted acceleration of palpitations and onset of dyspnea. Those complaints were reason to reduce exercise as much as possible. The use of a β-blocking agent (metoprolol), prescribed by his general physician, resulted in less palpitations but they still appeared during exercise.
Source: Heart Rhythm - Category: Cardiology Authors: Tags: Josephson and Wellens ECG Lessons: A Monthly Visit to the 12 Lead ECG Source Type: research