Outcomes and efficacy of magnetic resonance imaging-compatible sacral nerve stimulator for management of fecal incontinence: A multi-institutional study

Table 1 Baseline characteristics of patient undergoing sacral nerve stimulation using magnetic resonance imaging-compatible InterStim^TM system

Variable/Characteristics	Percentage	mean ± SD
Sex as F/M	78.1/18.1	-
Diabetes	57.5	-
Fecal incontinence	98.6	-
Diarrhea	22.1	-
Urinary incontinence	28.8	-
Age in yr	-	63.29 ± 12.2
Follow-up in month	-	6.62 ± 3.5

F: Female; M: Male; SD: Standard deviation.

Table 2 Characteristics of procedures done during sacral nerve stimulation

Intervention performed	Percentage	Remarks
Procedure
Peripheral nerve evaluation	20.5	-
Stage 1 f/by full implant	76.7	-
Stage 1 only	1.4	Patient did not show good response
Rechargeable InterStimTM	43.8	-

Remark: One patient decided to not go ahead with Stage 2 after a PNE.

Table 3 Complications or adverse events related to the InterStim^TM placement

Complications/Adverse events	Percentage	Number
Intraoperative lead migration	9.6	7
Infection	1.4	1
Hematoma	1.4	1
Nerve pain	2.8	2
Retained lead/fracture	2.8	2
Did not work	1.4	1

Table 4 Further modification of technique and removal of leads related to the complications

Interventions	Percentage	Number
Change of technique1	12.98	10
Removal of leads	4.1	32

¹Suture lead to subcutaneous.

²Infection (n = 1); Lead fracture (n = 1); Did not work (n = 1).

Table 5 Parameters for full body magnetic resonance imaging scans in presence of Medtronic InterStim with SureScan leads (Adapted from Huang X et al[12])

Scanner strength	1.5T	3T
SAR limit in W/kg	2	1.4
B1 +rms Limit in µT	4	2
Allowed continuous scan time	30 min	30 min
Wait time	5 min	5 min

Abbreviations: MRI, Magnetic Resonance Imaging; rms, root‐mean square; SAR, specific absorption rate; T, Tesla