| Parameter | Baseline (Mean ± SD) | Phone Not Ringing (Mean ± SD) | Phone Ringing (Mean ± SD) | p Value |
| Heart Rate (bpm)1 | 74.58 ± 15.21 | 74.08 ± 15.07 | 74.83 ± 15.01 | 0.938 |
| QT Interval (ms)2 | 381.24 ± 37. 31 | 382.96 ± 36.64 | 384.00 ± 37.00 | 0.868 |
| QT3 Interval (ms) | 406.49 ± 22.57 | 407.42 ± 21.43 | 405.77 ± 42.94 | 0.930 |
| QTd4 (ms) | 46.88 ± 22.67 | 47.54 ± 22.67 | 47.52 ± 23.91 | 0.974 |