Table 2. Events’ classifications.

Abbreviation	Explanation
TPRE	True Positive Real Event
TP Predict	True Positive Predictive
FP Art	False Positive Artifact (e.g. CVP 200 mmHg or Arterial pressure -10 mmHg)
FP Ins Dif	False Positive Insufficient Definition (e.g. patient on LVAD with Vtach or atrial fibrillation)
FN Th	False Negative threat or late (definition failure)
FN No Th	False negative non-threat (e.g. atrial fibrillation without significant hypotension).
FN Sens Off	False Negative sensor off (e.g. atrial fibrillation that occurred while RN was positioning patient and EKG was disconnected).
TN Time Int	Time Interval. These were the patients for which no events were registered during the time period of the observation.