
Simultaneous wide and narrow QRS complex tachycardia: what is the mechanism?
Keywords: Atrioventricular nodal reentrant tachycardia; Right ventricular outflow tract tachycardia; Double tachycardia; Spontaneous entrainmentTaquicardia de reentrada nodal auriculoventricular; Taquicardia do tracto de saída do ventrículo direito; Taquicardia dup