Table 3

Electrophysiological characteristics of patients who underwent a second electrophysiological study

Patients	ECG 1	HV 1 ms	Indication 2nd electrophysiological study	Time interval between EP in months	ECG 2	SA-ECG2	HV 2 ms	Pacemaker
1	Normal	45	Follow-up	75	Normal	Negative	50	No
2	Normal	55	Follow-up	136	Normal	Negative	55	No
3	Normal	35	CP and palpitations	48	Normal	Negative	50	No
4	LAB	50	Follow-up	58	LAB	Positive	60	No
5	AVB 1 + RBBB	58	Presyncope	48	AVB 1 + RBBB	Negative	65	No
6	AVB 1	60	ECG modification	24	AVB 1	Negative	80	Yes
7	Normal	50	ECG modification	108	LAB	Positive	70	Yes
8	Normal	40	Follow-up	118	Normal	Positive	45	No
9	Normal	55	Follow-up	78	Normal	Negative	60	No
10	Normal	55	Follow-up	132	Normal	Negative	55	No
11	Normal	30	Syncope	50	Normal	Negative	50	No
12	Normal	50	Follow-up	144	Normal	Negative	60	No
13	Normal	50	ECG modification	132	LBBB	^†	90	Yes
14	LAB	55	Follow-up	132	LAB	Negative	50	No
15	Normal	60	Follow-up	96	Normal	Negative	60	No
16	LAB + RBBB	60	ECG modification	96	AVB 1 + LAB + RBBB	Positive	80	Yes
17	AVB 1	50	Follow-up	72	AVB 1	–	50	No
18	LAB	50	Follow-up	96	LAB	Negative	60	No
19	LAB	55	Follow-up	142	LAB	Negative	65	No
20	Normal	50	Bradytachycardia	72	Normal	Negative	55	Yes^*
21	Normal	60	SA-ECG +	43	Normal	Negative	60	No
22	Normal	50	Follow-up	120	Normal	Negative	65	No
23	Normal	60	Syncope, SA-ECG +	90	Normal	Positive	60	No
24	Normal	60	SA-ECG +	40	Normal	Positive	80	Yes
25	Normal	60	Follow-up	120	Normal	Negative	60	No

Signal-averaged (SA)-ECG was regarded as the presence of QRSD of 100 ms or greater and LAS40 of 36 ms or greater.15
↵* Pacemaker implanted for brady-tachycardia syndrome.
↵† Invalid because of noise.
AVB 1, atrioventricular block 1; CP, chest pain; EP, electrophysiological testing; HV, His-ventricle; LAB, left anterior block; LBBBG, left bundle branch block, RBBB, right bundle branch block.