Table 3.

Patients' pre-operative and post-operative PR, QRS, QT levels and QTc interval on ECG by using Bazett, Frederichia, Framingham and Hodges formulas.

No.	Diagnosis	PR interval, (ms)/p = 0.934m		QRS duration, (ms)/p = 0.588 m		QT interval, (ms)/p = 0.533 m		QTc Bazett, (ms)/p = 0.130 m		QTc Friderichia, (ms)/p = 0.319 m		QTc Framingham, (ms)/p = 0.262 m		QTc Hodges, (ms)/p = 0.221 m		HR/bpm/p = 0.003 m
		Pre-op	Post-op	Pre-op	Post-op	Pre-op	Post-op	Pre-op	Post-op	Pre-op	Post-op	Pre-op	Post-op	Pre-op	Post-op	Pre-op	Post-op
1	LQTS-JLNS	144	144	74	72	500	478	642	552	598	526	561	517	568	513	101	81
2	CPVT	148	154	92	96	408	416	453	453	438	440	437	440	443	435	74	67
3	CPVT	160	152	86	102	498	396	426	409	449	405	442	406	470	403	68	64
4	CPVT	152	158	88	92	389	402	441	422	423	416	423	415	419	413	77	66
5	LQTS-7	142	140	92	90	402	400	428	429	419	420	420	419	416	416	78	69
6	LQTS-7	170	168	78	72	446	422	449	439	441	440	443	440	443	436	68	58
7	LQTS-JLNS	132	138	86	89	445	430	520	485	494	462	486	465	484	458	82	76
8	CPVT	166	154	92	102	388	378	434	425	418	410	418	409	414	406	95	75
9	CPVT	156	163	98	90	379	403	454	448	427	432	427	432	425	428	86	74
10	CPVT	148	152	96	92	366	389	436	417	411	409	411	408	410	405	85	68
11	LQTS-1 + 2	171	178	86	84	422	403	429	426	427	419	427	418	426	415	72	67
12	LQTS-1	163	162	81	83	455	446	498	478	484	465	481	466	476	462	80	69
13	LQTS-7	167	169	79	85	420	404	443	434	429	430	430	429	427	425	72	64
14	LQTS-JLNS	129	139	99	95	465	466	512	489	492	480	487	481	483	477	73	66
15	CPVT	163	149	83	88	422	418	443	421	436	421	436	420	432	420	66	61

QTc: corrected QT interval, ECG: electrocardiogram, LQTS: long-QT syndrome, CPVT: catecholaminergic polymorphic ventricular tachycardia, JLNS: Jervell and Lange Nielsen syndrome, LQTS-7: Andersen Tawil syndrome, Pre-op: pre-operative, Post-op: post-operative, HR: heart rate, ms: milliseconds, bpm: beats per minute, m: Mann-Whitney U test.