Title: Evaluation of a licensed double-sensor-heat-flux (DHF) non-invasive core temperature sensor in small children and toddlers undergoing surgery. CI/PS identification code: DHF-TaSC Device Name: Tcore™ system (Tcore-Adapter MP00999 \& Tcore-Sensor MP 00989) Manufacturer: Drägerwerk AG \& CO KGaA Study design: Prospective, single arm, clinical study Patients: * Number: 72 * Age / gender: females and males between 0 and 7 years * Patients of a tertiary referral, university-affiliated hospital undergoing surgery Exclusion Criterions: * Operation site, rash or infection that prevents the application of the heat flux thermometers. * Patients and/or legal guardians not willing to participate in the trial. * Patients older than 7 years Setting: ORs of a tertiary referral, university-affiliated hospital. Study variables: measurement triplets measured via two double-sensor-heat-flux (DHF) thermometer the Tcore™ (Dräger, Drägerwerk AG \& Co KG, 23558 Lübeck, Germany) one placed on the forehead and one on the upper belly and temperature measured by a rectally placed temperature probe.
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Accuracy of Tcore core temperature measurements
Timeframe: For the duration of Anesthesia and a maximum of 12 hours