Method and apparatus based on combination of physiological parameters for assessment of analgesia during anesthesia or sedation
First Claim
1. A method for monitoring a condition of a patient under anesthesia or sedation, the method comprising the steps of:
- acquiring at least a first signal representing a cardiovascular activity of the patient;
deriving, from said first signal, at least a first and a second parameter value, said first and second parameter values being related to two mutually different quantities selected from a group of quantities including waveform amplitudes, waveform periodicity, waveform morphology, and waveform variability;
applying a predetermined mathematical index for probability of patient comfort, in which index said at least first and second parameters are variables;
calculating successively changing values of said mathematical index; and
indicating said successive index values.
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Abstract
The invention relates to a method for monitoring a condition of a patient under anesthesia or sedation, whereupon one, two, three or more signals are acquired, and the signal(s) represent(s) cardiovascular and/or combined electrical biopotential on skull activity of the patient. From said signal or signals are derived or calculated at least two parameter values related to a quantity like waveform amplitude, waveform periodicity, waveform morphology, waveform variability, energy, power, signal complexity and frequency content. A predetermined mathematical index for probability of patient comfort is used, in which function said parameters are variables, and successively changing probability index values of said mathematical index is calculated.
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Citations
20 Claims
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1. A method for monitoring a condition of a patient under anesthesia or sedation, the method comprising the steps of:
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acquiring at least a first signal representing a cardiovascular activity of the patient; deriving, from said first signal, at least a first and a second parameter value, said first and second parameter values being related to two mutually different quantities selected from a group of quantities including waveform amplitudes, waveform periodicity, waveform morphology, and waveform variability; applying a predetermined mathematical index for probability of patient comfort, in which index said at least first and second parameters are variables; calculating successively changing values of said mathematical index; and indicating said successive index values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for monitoring a condition of a patient under anesthesia or sedation, the method comprising the steps of:
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acquiring at least a first signal and a second signal representing a cardiovascular activity of the patient; deriving, from said first signal and second signal, at least a first and a second parameter value, said first and second parameter values being related to two mutually different quantities selected from a group of guantities including waveform amplitudes, waveform periodicity, waveform morphology, and waveform variability; applying a predetermined mathematical index for probability of patient comfort, in which index said at least first and second parameters are variables; calculating successively changing values of said mathematical index; and indicating said successive index values. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification