TABLE 1.

Patients information.

Patient	Gender	Age (years)	β-blocking Drug	QTc (ms)	QTc leaving 90% of control QTc below (ms)	QTc increment (%)
1	Male	1	Nadolol	542	434	24.9
		(7 months)		516	434	18.9
2	Female	29	Nadolol	503	437	15.1
				498	437	14.0
3	Female	11	Nadolol	555	434	27.9
				528	434	21.7
4	Female	2	Propranolol	471	434	8.5
				556	434	28.1
					Average	19.9

This table contains anonymized relevant data of our four patients (from 1 to 4), namely, from left to right, their assigned code, gender, age (in years), the name of the administered β-blocking drug, registered QTc interval values (in ms), reference QTc values (in ms) and calculated QTc increment (in %). The last row shows the average QTc increment.