Table 1.
Specifications of completely implantable cardiac pacemakers
| Specificationms | Nanostim™ leadless cardiac pacemaker | Micra™ transcatheter pacing system |
|---|---|---|
| Volume (cm3) | 1 | 0.8 |
| Length (mm) | 41.4 | 25.9 |
| Weight (g) | 2 | 2 |
| Introducer size (French) | 18 | 23 |
| Primary fixation mechanism | Screw-in helix | Self-expanding nitinol tines |
| Secondary fixation mechanism | Nylon tines | |
| Pacing mode | VVI/VVIR | VVI/VVIR |
| Rate response sensor | Temperature | Accelerometer |
| Energy supply | Integrated battery | Integrated battery |
| Battery | Lithium carbon-monofluoride | Lithium silver vanadium oxide/carbon monoflouride |
| Battery longevity (years) | 9.8 100%/2.5 V/0.4 ms/60b.p.m. |
10 100%/1.5 V/0.24 ms/60 b.p.m. |
| Device retrieval option | Yes | Yes |
| Telemetry | Conductive | Radio frequency |