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. Author manuscript; available in PMC: 2018 Jul 1.
Published in final edited form as: Crit Care Med. 2017 Jul;45(7):e683–e690. doi: 10.1097/CCM.0000000000002364

Figure 1.

Figure 1

Illustration of (a) the proposed automatic sedation classification system, (b) the calibration window (initial 24 hours of ECG ) and prediction window using 15 minutes of ECG (15 minutes was found as optimal window length in the classification) for patient-specific system, (c) identifying optimal RRI epoch length for sedation level assessment (d) a sample RRI, (e) its corresponding spectrogram, and (f) sample probability output from the patient specific classification where day 1 recording is used for calibrating the system and the predicted on the remaining days.