Predicting Outcomes Using Infra-red SEnsors, a Feasibility Study.

This project will investigate the potential effect of a protocol, targeted at counteracting cerebral desaturation during anaesthesia, with the aim of reducing negative post-operative changes in children. Negative post-operative changes (NPOBC) represent a surrogate outcome for neurocognitive damage associated with hemodynamic changes during general anaesthesia. This is a feasibility study that will examine anaesthesia team´s reactions to changes in (1) regional cerebral oxygen saturation (crSO2) (2) systemic hypotension or hypoxaemia, while also reporting any technical issues with data acquisition. We will also estimate the incidence of negative post-operative changes and explore any association with reduced crSO2 in our patient population compared with previous international data. Specifically, this feasibility study will provide data for the robust design and power analysis of a large-scale, randomised interventional trial in children undergoing anaesthesia, with the utilisation of a protocol targeting cerebral oxygen desaturation vs a control group of standard care with no access to crSO2 monitoring.

Methods At least 500 children of ages 6 months - 59 months will be recruited from at least 5 centers around the world. Besides routine monitoring, cerebral regional oxygen saturation (crsO2 will be monitored throughout the procedure.

Primary outcome The primary outcome is the feasibility of successful data collection of crO2, physiological and PHBQ data in a larger population over multiple international sites. This includes the incidence of technical problems with NIRS monitoring and the parental noncompliance with PHBQ reporting will be determined.

Secondary outcomes:

• The incidence of reduced crSO2 below baseline (more than 10%)
• The area under the curve (AUC) of reduced crSO2 below baseline
• The incidence of negative postoperative behaviour changes as determined by the PHBQ administered on day 7 & 30 following surgery.
• A set of threshold values for and form of interventions to restore cr02 and/or mean arterial blood pressure (Actions may include any of the following interventions fluid bolus, vasoactive agents, Trendelenburg position, adjustment of anaesthetic dose, and change of ventilation settings)
• The incidence of negative post-operative behavioural change and the extent of any association with the AUC of crSO2 below baseline

Inclusion criteria

• Children scheduled for both elective and non-elective, non-cardiac surgical procedures under general anaesthesia.

Exclusion criteria

• age < 6 months or ≥ 59 months

• procedures requiring < 30 minutes of general anaesthesia
• imaging procedures
• procedures involving neurosurgery, oncology or burns
• procedures involving significant pain lasting for more than 1 week on average (e.g. tonsillectomies, major orthopaedic surgery)
• other procedures that limit access to the forehead
• children that are on supplemental oxygen, are sedated or intubated at the time of inclusion
• children with severe developmental delay
• procedures with planned postoperative intensive care or hospital stay > 3 days