Oxgen saturation measurement with the pulse oximetry is considered as a standard of care for respiratory system monitoring. The evaluation of measured oxygen saturation could lead to the clinical decision making in taking care of patient with respiratory failure. Smart electronics (such smart phones, smart watch, and others) are currently equipped with the sensors and applications that allows the peripheral oxygen saturation, however the corelation between the validated measurement (pulse oximetry) and smart electronics measurement is not known at the moment. In case of close correlation and high sensitivity, could be the smart electronics used for oxygenation evaluation of outpatients together with possible early deterioration detection.

After informed consent from patients and/or legal guardian the oxygen saturation will be measured by calibrated pulse oxymetry (validated for medical use only) and by smart electronics (smart phones and smart wearable) in pediatric patients during the preanesthesia evaluation, under general anesthesia, during the postanesthesia care unit (PACU) stay, and at pediatric intensive care unit (PICU) stay. In one patient, overall 6 measurements in will be performed (3 on right and 3 on left hand).

Inclusion Criteria:

• Informed consent
• pediatric patients during preanesthesia visit
• pediatric patients during general anesthesia
• pediatric patients during PACU stay
• pediatric patients during PICU stay

Exclusion Criteria:

• outside age limits
• refused to participate

Pediatric patients during during preanesthesia visit, general anesthesia, PACU and PICU stay will be eligible for inclusion