Table 1.
Comparison between the two clinical leadless permanent pacemakers (PPM) systems.
| Parameter | Micra (Medtronic, Inc., USA) | Nanostim (Saint Jude Medical, USA) |
|---|---|---|
| Volume | 0.8 cm3 | 1 cm3 |
| Size | 25.9 mm × 6.7 mm | 42 mm × 5.99 mm |
| Weight | 1.75 g | 2 g |
| Fixation | Passive nitinol tines | Active helix screw |
| Battery | lithium silver oxide/carbon monofluoride | lithium carbon monofluoride |
| Estimated battery longevity | 10 years | 14.7 years |
| Rate response mechanism | 3-D accelerometer | Blood temperature sensing |
| Communication with remote programmer-‘telemetry’ | Radio-frequency signals | Conductive communication through skin electrodes |