Table 1.
Summary of implants and devices.
| Sheep | Day (Device) | Battery Voltage (V) | Stimulus Output Charge (μC) | Dataset Length (s) | Minimal Interval (s) | FHR (bpm) | Summary |
|---|---|---|---|---|---|---|---|
| A | Op Day | 3.9 | 2.77 | 146 | 0.155 | 165–210 | The pacemaker was perfectly
located, with the nose wedged into the diaphragm, the flexible lead
partially extended and straight and the electrode buried in the left
ventricular wall. Fetus miscarried on POD5. |
| POD1 | 3.8 | 2.70 | 60 | 0.171 | 178 | ||
| POD3 | 3.6 | 2.56 | 60 | 0.109 | 262 | ||
| B | Op Day (Device I) | 3.9 | 2.73 | 36 | 0.151 | 242 | Device I was implanted first
and pushed into the myocardium with the insertion of device II. Xray and
histology confirmed that the electrodes were intertwined and the
electrode path of Device II extended approximately 3.7 mm into the
epicardial surface. Electively terminated on POD15 |
| Op Day (Device II) | 3.9 | 2.73 | 36 | 0.121 | 242 | ||
| POD2 (Device II) | 3.7 | 2.60 | 15 | 0.161 | 180–196 | ||
| C | OD | 3.9 | 6.10 | 110 | 0.175 | 157 | The electrode tip was implanted
adjacent to the epicardium, but not engaged in tissue (confirmed by
pathology); the location of the electrode outside the myocardium is
consistent with the high and increasing threshold. Experiment terminated at pre-mature labor on POD 5 |
| POD2 | 3.0 | 4.48 | 30 | 0.168 | 170–200 | ||
| D | OD Early | 3.7 | 2.67 | 36 | 0.200 | 177 | The electrode was implanted
adjacent to myocardium, but not fully engaged into it. Fetus miscarried on POD 5 |
| OD Recharging | 3.7 | 2.67 | 50 | 0.189 | 174 | ||
| OD Post-Charging | 3.7 | 2.67 | 16 | 0.194 | 178 |