 In our study, a continuous blinded monitoring will be set up as soon as patients admittance for all eligible subjects. We will study, for children in cardiac post-surgery, ANI NIPE values and COMFORT B values during both painful and non-painful cares to determine correlation between those values. We will analyze a posteriori the ANINIPE values, through a standardized protocol, to recount the sequence of care and to determine discrepancies in drug consumption. Data gathering will be made in the first 48h after admittance in PICU. Patients will not be followed after leaving PICU Pediatric intensive care units. 