Table 2:

Summary of CIED characteristics

	All	<18 years of age	Epicardial leads	Abandoned endocardial leads	Abandoned epicardial leads
MRIs	54	23	20	10	8
CIED type
Pacemaker	43 (80)	19 (83)	19 (95)	6 (60)	6 (75)
ICD	7 (13)	3 (13)	1 (5)	2 (20)	0 (0)
No CIED*	4 (7)	1 (4)	0 (0)	2 (20)	2 (25)
CIED age at MRI, yrs	4.0 [2.3–6.0]	4.0 [3.0–6.0]	4.0 [2.0–6.3]	4.0 [3.3–5.0]	3.5 [2.3–4.0]
CIED lead age at MRI, yrs	6.0 [4.0–9.0]	6.0 [4.0–7.0]	6.0 [4.3–8.8]	5.0 [4.8–6.8]	8.0 [4.0–10.0]
CIED generator body position
Left chest	26 (48)	11 (48)	4 (20)	2 (20)	3 (38)
Left abdomen	15 (28)	11 (48)	15 (75)	0 (0)	3 (38)
Right chest	8 (15)	0 (0)	1 (5)	6 (60)	0 (0)
Unknown	1 (2)	0 (0)	0 (0)	0 (0)	0 (0)
Pacing dependent	14 (26)	7 (30)	9 (45)	0 (0)	3 (38)
MRIs with epicardial leads	20 (37) 19 patients	14 (61) 13 patients	20 (100) 19 patients	0 (0)	4 (50) 4 patients
MRIs with abandoned leads	18 (33) 12 patients	5 (22) 5 patients	4 (20) 4 patients	10 (100) 5 patients	8 (100) 7 patients
Endocardial	10 (19) 5 patients	1 (4) 1 patient	0 (0)	10 (100) 5 patients	0 (0)
Epicardial	8 (15) 7 patients	4 (17) 4 patients	4 (20) 4 patients	0 (0)	8 (100) 7 patients
MRI conditional CIED generator	14 (26)	3 (13)	2 (10)	4 (40)	3 (38)
MRI conditional system	10 (19)	2 (9)	0 (0)	4 (40)	0 (0)

Values are N, N (%), or median [IQR] unless otherwise indicated.

^*Patients with abandoned leads but no CIED.

CIED indicates cardiac implantable electronic device; N, number; IQR, interquartile range.