Table 2 Open in new tab Baseline patient...

Baseline characteristics	MR-conditional system	Non-MR conditional system	P
No. of scans	533	615
No. of patients	462	509
Patient characteristics
Age (years), median (IQR)	65	(50, 75)	73	(65, 79)	<0.001
Male sex	369	(69%)	430	(70%)	0.6305
Hospitalized inpatient	39	(7%)	31	(5%)	0.1079
Previous MRI with a CIED	71	(13%)	106	(17%)	0.0973
Pacing-dependent	70	(13%)	98	(16%)	0.2092
MRI examination
Cardiac	321	(54%)	185	(27%)	<0.001
Spine	122	(20%)	158	(23%)
Head	93	(16%)	202	(30%)
Abdomen or pelvis	46	(8%)	91	(14%)
Extremity or joint	9	(1%)	36	(5%)
Other	6	(1%)	3	(1%)
Device characteristics
PPM	332	(62%)	330	(54%)	0.0352
ICD	149	(28%)	168	(27%)
CRT-P	15	(3%)	26	(4%)
CRT-D	37	(7%)	91	(15%)
Pulse generator characteristics
MR-conditional	533	(100%)	122	(20%)	–
Age (years), median (IQR)	1	(1, 2)	4	(2, 6)	<0.001
Number older than 10 years	0	(0%)	13	(2%)
Pulse generator manufacturer
Boston Scientific	139	(26%)	183	(30%)	<0.001
Abbott	44	(8%)	151	(25%)
Biotronik	64	(12%)	21	(3%)
Medtronic	282	(53%)	241	(39%)
Sorin	4	(1%)	17	(3%)
Lead characteristics	MR-conditional lead	Non-MR conditional lead
RA lead	739	(43%)	228	(42%)	0.0746
RV lead	559	(32%)	177	(32%)
HV (ICD) lead	312	(18%)	88	(16%)
LV lead	112	(7%)	53	(10%)
Age (years)	2	(1, 4)	8	(4, 12)	<0.001
No. greater than 10 years old	7	0 (4%)	168	(31%)	—
Abandoned leads		—	40	(7%)	—

Baseline characteristics

MR-conditional system

Non-MR conditional system

No. of scans

533

615

No. of patients

462

509

Patient characteristics

Age (years), median (IQR)

(50, 75)

(65, 79)

<0.001

Male sex

369

(69%)

430

(70%)

0.6305

Hospitalized inpatient

(7%)

(5%)

0.1079

Previous MRI with a CIED

(13%)

106

(17%)

0.0973

Pacing-dependent

(13%)

(16%)

0.2092

MRI examination

Cardiac

321

(54%)

185

(27%)

<0.001

Spine

122

(20%)

158

(23%)

Head

(16%)

202

(30%)

Abdomen or pelvis

(8%)

(14%)

Extremity or joint

(1%)

(5%)

Other

(1%)

Device characteristics

PPM

332

(62%)

330

(54%)

0.0352

ICD

149

(28%)

168

(27%)

CRT-P

(3%)

(4%)

CRT-D

(7%)

(15%)

Pulse generator characteristics

MR-conditional

533

(100%)

122

(20%)

–

Age (years), median (IQR)

(1, 2)

(2, 6)

<0.001

Number older than 10 years

(0%)

(2%)

Pulse generator manufacturer

Boston Scientific

139

(26%)

183

(30%)

<0.001

Abbott

(8%)

151

(25%)

Biotronik

(12%)

(3%)

Medtronic

282

(53%)

241

(39%)

Sorin

(1%)

(3%)

Lead characteristics

MR-conditional lead

Non-MR conditional lead

RA lead

739

(43%)

228

(42%)

0.0746

RV lead

559

(32%)

177

(32%)

HV (ICD) lead

312

(18%)

(16%)

LV lead

112

(7%)

(10%)

Age (years)

(1, 4)

(4, 12)

<0.001

No. greater than 10 years old

0 (4%)

168

(31%)

—

Abandoned leads

—

(7%)

—

Baseline characteristics	MR-conditional system	Non-MR conditional system	P
No. of scans	533	615
No. of patients	462	509
Patient characteristics
Age (years), median (IQR)	65	(50, 75)	73	(65, 79)	<0.001
Male sex	369	(69%)	430	(70%)	0.6305
Hospitalized inpatient	39	(7%)	31	(5%)	0.1079
Previous MRI with a CIED	71	(13%)	106	(17%)	0.0973
Pacing-dependent	70	(13%)	98	(16%)	0.2092
MRI examination
Cardiac	321	(54%)	185	(27%)	<0.001
Spine	122	(20%)	158	(23%)
Head	93	(16%)	202	(30%)
Abdomen or pelvis	46	(8%)	91	(14%)
Extremity or joint	9	(1%)	36	(5%)
Other	6	(1%)	3	(1%)
Device characteristics
PPM	332	(62%)	330	(54%)	0.0352
ICD	149	(28%)	168	(27%)
CRT-P	15	(3%)	26	(4%)
CRT-D	37	(7%)	91	(15%)
Pulse generator characteristics
MR-conditional	533	(100%)	122	(20%)	–
Age (years), median (IQR)	1	(1, 2)	4	(2, 6)	<0.001
Number older than 10 years	0	(0%)	13	(2%)
Pulse generator manufacturer
Boston Scientific	139	(26%)	183	(30%)	<0.001
Abbott	44	(8%)	151	(25%)
Biotronik	64	(12%)	21	(3%)
Medtronic	282	(53%)	241	(39%)
Sorin	4	(1%)	17	(3%)
Lead characteristics	MR-conditional lead	Non-MR conditional lead
RA lead	739	(43%)	228	(42%)	0.0746
RV lead	559	(32%)	177	(32%)
HV (ICD) lead	312	(18%)	88	(16%)
LV lead	112	(7%)	53	(10%)
Age (years)	2	(1, 4)	8	(4, 12)	<0.001
No. greater than 10 years old	7	0 (4%)	168	(31%)	—
Abandoned leads		—	40	(7%)	—

Table 2

Open in new tab

Baseline patient and cardiac implantable electronic device characteristics

Baseline characteristics	MR-conditional system		Non-MR conditional system		P
No. of scans	533		615
No. of patients	462		509
Patient characteristics
Age (years), median (IQR)	65	(50, 75)	73	(65, 79)	<0.001
Male sex	369	(69%)	430	(70%)	0.6305
Hospitalized inpatient	39	(7%)	31	(5%)	0.1079
Previous MRI with a CIED	71	(13%)	106	(17%)	0.0973
Pacing-dependent	70	(13%)	98	(16%)	0.2092
MRI examination
Cardiac	321	(54%)	185	(27%)	<0.001
Spine	122	(20%)	158	(23%)
Head	93	(16%)	202	(30%)
Abdomen or pelvis	46	(8%)	91	(14%)
Extremity or joint	9	(1%)	36	(5%)
Other	6	(1%)	3	(1%)
Device characteristics
PPM	332	(62%)	330	(54%)	0.0352
ICD	149	(28%)	168	(27%)
CRT-P	15	(3%)	26	(4%)
CRT-D	37	(7%)	91	(15%)
Pulse generator characteristics
MR-conditional	533	(100%)	122	(20%)	–
Age (years), median (IQR)	1	(1, 2)	4	(2, 6)	<0.001
Number older than 10 years	0	(0%)	13	(2%)
Pulse generator manufacturer
Boston Scientific	139	(26%)	183	(30%)	<0.001
Abbott	44	(8%)	151	(25%)
Biotronik	64	(12%)	21	(3%)
Medtronic	282	(53%)	241	(39%)
Sorin	4	(1%)	17	(3%)
Lead characteristics	MR-conditional lead		Non-MR conditional lead
RA lead	739	(43%)	228	(42%)	0.0746
RV lead	559	(32%)	177	(32%)
HV (ICD) lead	312	(18%)	88	(16%)
LV lead	112	(7%)	53	(10%)
Age (years)	2	(1, 4)	8	(4, 12)	<0.001
No. greater than 10 years old	7	0 (4%)	168	(31%)	—
Abandoned leads		—	40	(7%)	—

Baseline characteristics	MR-conditional system		Non-MR conditional system		P
No. of scans	533		615
No. of patients	462		509
Patient characteristics
Age (years), median (IQR)	65	(50, 75)	73	(65, 79)	<0.001
Male sex	369	(69%)	430	(70%)	0.6305
Hospitalized inpatient	39	(7%)	31	(5%)	0.1079
Previous MRI with a CIED	71	(13%)	106	(17%)	0.0973
Pacing-dependent	70	(13%)	98	(16%)	0.2092
MRI examination
Cardiac	321	(54%)	185	(27%)	<0.001
Spine	122	(20%)	158	(23%)
Head	93	(16%)	202	(30%)
Abdomen or pelvis	46	(8%)	91	(14%)
Extremity or joint	9	(1%)	36	(5%)
Other	6	(1%)	3	(1%)
Device characteristics
PPM	332	(62%)	330	(54%)	0.0352
ICD	149	(28%)	168	(27%)
CRT-P	15	(3%)	26	(4%)
CRT-D	37	(7%)	91	(15%)
Pulse generator characteristics
MR-conditional	533	(100%)	122	(20%)	–
Age (years), median (IQR)	1	(1, 2)	4	(2, 6)	<0.001
Number older than 10 years	0	(0%)	13	(2%)
Pulse generator manufacturer
Boston Scientific	139	(26%)	183	(30%)	<0.001
Abbott	44	(8%)	151	(25%)
Biotronik	64	(12%)	21	(3%)
Medtronic	282	(53%)	241	(39%)
Sorin	4	(1%)	17	(3%)
Lead characteristics	MR-conditional lead		Non-MR conditional lead
RA lead	739	(43%)	228	(42%)	0.0746
RV lead	559	(32%)	177	(32%)
HV (ICD) lead	312	(18%)	88	(16%)
LV lead	112	(7%)	53	(10%)
Age (years)	2	(1, 4)	8	(4, 12)	<0.001
No. greater than 10 years old	7	0 (4%)	168	(31%)	—
Abandoned leads		—	40	(7%)	—

Magnetic resonance conditionality stratification is by complete CIED system classification except for lead numbers, which are stratified by individual lead MR-conditionality. Pacesetter leads were labelled as Abbott (St Jude Medical); Intermedics as Boston Scientific; ELA as Sorin; and Vitatron as Medtronic. One patient underwent lead extraction and replacement between MRI scans changing magnetic resonance conditionality of the device, so total number of unique patients is 970. Some patients had multiple body part examinations per individual scan.

CIED, cardiac implantable electronic device; CRT-P/D, cardiac resynchronization therapy-pacemaker/defibrillator; HV, high voltage; ICD, implantable cardioverter-defibrillator; IQR, interquartile range; MRI, magnetic resonance imaging; PPM, permanent pacemaker.

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