Sigma® implantable pacemakers - advise patients to contact their follow-up clinic immediately if they experience a return of symptoms

(Medtronic) failure of interconnecting wires may cause loss of pacing output from atrial and or ventricular ports, premature depletion of battery, intermittent or total loss of telemetry, undersensing, high lead impedance values, loss of rate response, device reset to manufacturer's default settings. (MDA/2005/072)