investigators want to observe a group of pediatric patients who are going to undergo open thoracic surgery at Queen Silvia's child and youth hospital, Sahlgrenska University Hospital. Population that has been selected is between 6-36 months due to the fact that the physiological development does not differ significantly with respect to drug response and circulation. During general anesthesia and surgery, investigators will use an NIRS). A sensor is placed frontally on the head. This comparative study will study the relationship between regional oxygenation frontal and 2/4-channel EEG. An EEG sensor with adhesive will also be attached to the frontal on patient's forehead next to tendons from NIRS. Participants will be consulted consecutively at the thoracic surgeon who will undergo open thoracic surgery with the support of the hair removal machine and who have the intended age for the study at Queen Silvia's Children's and Youth Hospital, Salhgrenska University Hospital. Peroperatively, data collection will occur in 5-minute intervals for frontal and occipital measurements. The measurements are started before the patient is anesthetized and terminated when the patient is awakened. Usual monitoring parameters under general anesthesia will be collected and documented, see protocol.
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burst suppression (BS). Time of BS-percent during 1 minute, using Bispectral index monitor
Timeframe: 1 minute
regional cerebral saturation, NIRS method will be used
Timeframe: 1 minute