electrocardiogram: ventricular activation time (VAT) less than 0.06 seconds in lead V1
electrocardiogram: ventricular activation time (vat) less than 0.06 seconds in lead v1
electrocardiogram: ventricular activation time (VAT) less than 0.06 seconds in lead V1 (procedure)
electrocardiogram: ventricular activation time (vat) less than 0.06 seconds in lead v1 (procedure)