System for electroencephalographic detection of an inadequacy between the state of a patient placed under ventilatory support and the setting of the machine used for this support, and use of this detection to adjust the setting

A method for detecting, via a system for electroencephalographic detection of an improper adjustment of a ventilator, an improper adjustment of a ventilator used on a mammal, comprising the steps:

• receiving, from an electroencephalograph, a measurement of an electroencephalographic signal as a function of time;
• determining, via an input receiving a respiratory initiation signal, for each breathing cycle, a respiratory initiation time;
• specifying, using a beta band device, a beta frequency band comprised between 15 and 30 Hz and with a width comprised between 5 and 10 Hz;
• processing, with a processor, the measured electroencephalographic signal, as it is being acquired, in the sole beta frequency band;
• calculating, via the processor, the instantaneous power of the electroencephalographic signal in the sole beta frequency band;
• calculating, via the processor, for each breathing cycle, from the instantaneous power, an average power of the electroencephalographic signal in the sole beta frequency band over a first interval;
• storing, in memory, the calculated instantaneous power;
• and
• identifying, via the processor, for each breathing cycle, an improper adjustment of the ventilator based on the electroencephalographic signal processed in the sole beta frequency band;
• wherein indentifying an improper adjustment of the ventilator based on the electroencephalographic signal processed in the sole beta frequency band comprises:
• comparing the instantaneous power calculated in a second interval extending in advance of the respiratory initiation time with the average power calculated over the first interval, the first interval extending in advance of the second interval, and
• detecting, for each breathing cycle, a deviation between the average power calculated in the first interval and the instantaneous power calculated in the second interval, wherein said deviation comprises a decrease of the instantaneous power calculated in the second interval compared to the average power calculated over the first interval and is representative of an improper adjustment of the ventilator, and
• wherein the system for electroencephalographic detection of an improper adjustment of a ventilator comprises the electroencephalograph, an input receiving a respiratory initiation signal, the beta band device, the memory, and the processor.