Table 2.

Nine Events of Power-On Reset in Eight Patients.^*

Patient Number and Device Type	Examination No., Region of Imaging	Generator Manufacturer, Implantation Yr	Other System Components, Lead Length, Implantation Yr	Rhythm Changes	Generator Function Fully Restored	Scan Completed	Clinical Consequences
4, ICD	1, Thorax	Medtronic (7271), 1999	RA lead (6940), 52 cm, 1999	No	Yes	No	Pulling sensation in chest during MRI reported by patient
			RV lead (6945), 65 cm, 1999
52, Pacemaker	1, Brain	Medtronic (8968), 1997	RV lead (5032), 58 cm, 1997	No	Yes	Yes	None
	5, Brain	Medtronic (8968), 1997	RV lead (5032), 58 cm, 1997	No	No, VVI pacing†	Yes	Battery ERI before MRI, replacement required after MRI
113, Pacemaker	1, Brain	Medtronic (8160), 1999	RV lead (5024), 58 cm, 1999	No	Yes	Yes	None
165, Pacemaker	2, Abdomen	Medtronic (303), 2002	RA lead (5092), 53 cm, 2002	Yes	Yes	No	MRI aborted owing to pacing dependence and resultant brief pause after power-on reset
			RV lead (5092), 58 cm, 2002
265, Pacemaker	1, Brain	Medtronic (DR401), 2003	RA lead (5076), 45 cm, 2003	No	Yes	Yes	None
			RV lead (5076), 52 cm, 2003
413, Pacemaker	1, Brain	Medtronic (7960), 2009	RA lead (5534), 45 cm, 2009	No	Yes	Yes	None
			RV lead (5034), 58 cm, 2009
705, Pacemaker	1, Abdomen	Medtronic (303), 2000	RA lead (5076), 45 cm, 2000	No	Yes	Yes	None
			RV lead (5076), 52 cm, 2000
1141, Pacemaker	1, Abdomen	Medtronic (900), 2006	RV lead, model and length unavailable (implanted outside United States), 2006	No	Yes	Yes	None

^*Numbers shown in parentheses are model numbers. All scans were performed in the Magnetom Avanto scanner, with the exception of the scans for Patients 165, 705, and 1141, which were performed in the Magnetom Aera scanner. ERI denotes elective replacement indicator, ICD implantable cardioverter–defibrillator, RA right arterial, and RV right ventricular.

^†VVI, or ventricular inhibited pacing, is a programmed mode that inhibits ventricular pacing when intrinsic ventricular activation is sensed.