Pacemakers are responsible for maintaining and regulating the beat of the heart. People who have suffered severe heart trauma or who have an irregular heartbeat are often candidates for pacemakers. When a pacemaker fails, as the Medtronic Sigma pacemaker has, patients face serious injury and death. The 28,000 Medtronic Sigma pacemakers that have been implanted have been recalled because of a wire problem that showed up in 19 of the pacemakers.
Although the device has not caused a death, many of the malfunctioning pacemakers were discovered because patients were suffering from dizziness and fainting. If you use a Medtronic Sigma pacemaker, you should contact your doctor immediately. Medical expenses relating to the health effects and replacement of your pacemaker may be covered by Medtronic; contact a medical malpractice attorney immediately to have your questions answered.
The Medtronic Sigma pacemaker’s interconnecting wires fail, and when this happens, the pacemakers may cause:
- loss of pacing output, which regulates the heartbeat
- premature battery depletion
- loss of telemetry, which measures and reports irregular heartbeats
- undersensing, which means the pacemaker doesn’t adequately sense the heartbeat
- high lead impedance values, which means the electrical signals become too high or irregular
- loss of rate response, which means the pacemaker doesn’t respond as it should
Patients with Medtronic Sigma pacemakers are advised to contact their doctors immediately. If you use a Sigma pacemaker and you experience dizziness or fainting, call 911.


