Table 3.

Scenarios during magnetic resonance imaging requiring immediate action of the observing professional

Scenario	Possible reasons
Asystole	Device malfunction in asynchronous mode ‘Power-on reset’ with pacing inhibition by noise True bradycardia in non-pacemaker dependent patients in inhibitory mode
Ventricular fibrillation/tachycardia	R-on-T phenomenon in asynchronous pacing mode True arrhythmia
Sudden rise in heart rate	‘Power-on reset’ in inhibitory mode leading to pacing True endogenous tachycardia
Sudden drop in heart rate	‘Power-on reset’ in asynchronous mode True endogenous bradycardia in inhibitory mode