Table 1 Features used in signal abnormality index jSQI. k is the beat index.
Feature | Description | Abnormality CRITERIA |
|---|---|---|
P s | Systolic blood pressure (SBP) | P s > 300 mmHg |
P d | Diastolic blood pressure (DBP) | P d < 20 mmHg |
P m | Mean arterial pressure (MAP) | P m < 30 or P m > 200 mmHg |
f | Instantaneous heart rate (60/T) | f < 20 or f > 200 BPM |
P p | Pulse pressure (P s - P d ) | P p < 20 mmHg |
w | Noise term: mean of negative slopes | w < -40/100 mmHg/ms |
P s [k] - P s [k - 1] | Absolute change in instantaneous SBP | |ΔP s | > 20 mmHg |
P d [k] - P d [k - 1] | Absolute change in instantaneous DBP | |ΔP d | > 20 mmHg |
T[k] - T[k - 1] | Absolute change in instantaneous HR | |ΔT| > 2/3 s |