12-lead electrocardiogram: S in V1 + R in V5-6 was greater than 35mm
12-lead electrocardiogram: s in v1 + r in v5-6 was greater than 35mm
12-lead electrocardiogram: S in V1 + R in V5-6 was greater than 35mm (procedure)
12-lead electrocardiogram: s in v1 + r in v5-6 was greater than 35mm (procedure)