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to find out if the Micra pacemaker is right for you.

Micra Pacemaker

Orlando Health is proud to be one of the first hospitals in the area to offer the world’s smallest pacemaker to help treat patients with patients with an abnormally slow heart rate (bradycardia) or an irregular heartbeat (atrial fibrillation). The Micra® Transcatheter Pacing System (TPS), is a device that provides patients with the most advanced pacing technology at one-tenth the size of a traditional pacemaker. 

  • The Micra device's miniaturized size and minimally invasive approach leaves no visible sign of a medical device under the skin. This can mean fewer post-implant activity restrictions and no obstructions to shoulder movement.
  • Micra TPS is intended for patients who need a single chamber (also known as a ventricular pacemaker, or VVIR) pacemaker.

Micra Pacemaker Benefits

Not only is the Micra pacemaker 93 percent smaller than conventional versions, it also has no wires (called leads), both of which lower the risk of complications. 

With a conventional pacemaker, patients need either one or two wires — depending on their specific heart condition — to fix the timing and make the heart beat effectively. For patients needing only one wire, and who are not candidates for a conventional pacemaker perhaps due to infections or unhealthy veins in the heart, the Micra is a good option.

Additional benefits include:

  • Cosmetically invisible to the patient after implantation
  • Comparable in size to a large vitamin
  • Weighs the same as a penny (2 g)
  • Has an estimated average 12-year battery life
  • Is approved for full body MRI scans
  • Responds to patients’ activity levels by automatically adjusting therapy

How the Procedure Works

A pacemaker is designed to mimic the heart’s natural pacemaker, the sinus node. The pacemaker has two main purposes — pacing and sensing.

  • Pacing: A pacemaker will send an electrical impulse to the heart when the heart’s own rhythm is too slow or is interrupted. This electrical impulse starts a heartbeat.
  • Sensing: A pacemaker will also “sense” (monitor) the heart’s natural electrical activity. When the pacemaker senses a natural heartbeat, it will not deliver a pacing pulse.

Conventional pacemakers are surgically placed underneath the skin in the patient’s chest, with wires that connect to the heart. The Micra leadless pacemaker is inserted through a vein in the leg and advanced to the heart where it is directly implanted into the right ventricle via small tines and delivers electrical impulses that pace the heart through an electrode at the end of the device.