| 摘要 |
The invention relates to a method for monitoring a condition of a patient under anaesthesia or sedation. In the method a signal (S) is acquired representing a cardiovascular activity of the patient, and periodically repeated waveforms (P) are detected, followed by calculation of time intervals (Ti) between, and/or pressures (Bi) from, and/or temporal rates (Ri) from successive waveforms. Next at least one of the following-a mathematical time series (T1, T2 . . . Tn, Tn+1 . . . ), or a mathematical pressure series (B1, B2 . . . Bn, Bn+1 . . . ), or a mathematical rate series (R1, R2 . . . Rn, Rn+1 . . . ) is/are formed. Further in the method said time series and/or said pressure series and/or said rate series is mathematically filtered to provide successive average values ({overscore (Ti; {overscore (Bi; {overscore (Ri) over a predetermined first time period (tau), and a substantial decrease, or increase respectively in said average values is detected.
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