Table 2
Table 2 Alarms Detected
| Alarm | Total | True Positive | False Positive | Unclear | Comment |
| High HR (SpO2 sensor) | 79 | 75 | 1 | 3 | Occasionally reported HR value did not exceed threshold |
| Low HR (SpO2 sensor) | 21 | 15 | 3 | 3 | Occasionally reported HR value did not exceed threshold |
| Low SpO2 | 44 | 35 | 5 | 4 | Occasionally reported SpO2 value did not exceed threshold |
| Asystole | 79 | 0 | 79 | 0 | No SpO2 sensor present + noise or no signal |
| Ventricular Fibrillation | 46 | 0 | 46 | 0 | No SpO2 sensor present + noise |
| Ventricular Tachycardia | 0 | 0 | 0 | 0 | |
| Tachycardia (ECG) | 124 | 61 | 31 | 32 | Noise often mistaken for tachycardia |
| Bradycardia (ECG) | 18 | 12 | 5 | 1 | Occasionally reported HR value did not exceed threshold |
| Irregular rhythm | 116 | 43 | 34 | 39 | Noise often mistaken for irregular |
| Mismatch | 59 | 59 | 0 | 0 | |
| Noisy | 59 | 47 | 12 | 0 | |
| Leads Off | 56 | 49 | 2 | 5 | Noise sometimes mistaken for leads off |
| No Signal | 0 | 0 | 0 | 0 | |
| SpO2 sensor off | 86 | 85 | 1 | 0 | |
| AWOL | 329 | 309 | 16 | 4 | Occasionally periodic battery message from PDA lost |
| Battery | 16 | 15 | 1 | 0 |
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Unclear indicates that the alarm condition may or may not have been true, e.g., when a signal showing tachycardia is noisy, it can be difficult to see tachycardia. In other situations involving readings vs. thresholds, the reported number was near the threshold, but not over it, indicating either a race or a software bug in the reporting mechanism.
