Troponin T release comparing manually or magnetically guided radiofrequency ablation for AVNRT- a MAGMA AVNRT substudy

Figures & data

Table 1. Baseline characteristics of the patients.

	Remote magnetic navigation	Manually guided RFA	p-value
Number	34	36
Age	46 ± 15 years	42 ± 14 years	.25
Female	79%	69%	.34
BMI	25	26	.64
Duration of symptoms	13 years	9.7 years	.22
Hypertension	3 (8.8%)	4 (11%)	1
Diabetes	1 (2.9%)	3 (8.3)	.61
Coronary artery disease	0	2 (5.6%)	.49
Kidney failure	1 (2.9%)	1 (2.8%)	1
Smoking (former or present)	10 (29%)	15 (42%)	.28
Other heart disease	0	0	1

Table 2. Procedural data and recurrences/arrhythmia at follow up.

	Remote magnetic navigation	Manually guided RFA	p-value
Procedure time (min)	78	74	.32
Ablation time (min)	4.2	2.8	.017
Number of lesions (n)	4.9	3.3	.01
Ablation energy (watts)	34	33	.088
Disappearance of slow pathway (n)	19 (56%)	13 (36%)	.10
hs-cTnT	52	95	<.01
hs-cTnT/ minute ablation	12	34	<.01
Recurrence	0	2 (5.6%)	.49
Third-degree AV block leading to permanent pacemaker	0	2 (5.6%)	.49
Ventricular tachycardia	0	1 (2.8%)	1.00
Atrial fibrillation	1 (2.9%)	1 (2.8%)	1.00

Figure 1. High-sensitive cardiac troponin T (ng/L) measured 16–20 hours after RFA. The box displays the interquartile range (25th–75th percentiles) and the median. The length of the whiskers is 1.5 times the interquartile range. Values outside the whiskers (dots) are defined as outliers.