Proof-of-Concept Study of the SNOEZELEN Device on Anxiety Symptoms in Patients Hospitalized for Chemotherapy in a Pediatric Oncology Department

This is a monocentric proof-of-concept study using mixed methods (quantitative questionnaires and qualitative interviews) to explore the potential benefits of Snoezelen as a supportive care intervention in pediatric oncology.

The goal of this interventional study (minimal risk clinical trial - RIPH2) is to evaluate the effect of the Snoezelen multisensory relaxation approach on anxiety symptoms in children and adolescents aged 8 to 17 years who are hospitalized for chemotherapy in a pediatric oncology unit.

The primary research question is:

\- Does the use of Snoezelen reduce anxiety symptoms during hospitalization for chemotherapy in pediatric cancer patients?

Secondary research questions include:

* Does Snoezelen improve quality of life and reduce depressive symptoms? * Does Snoezelen reduce nausea and vomiting during chemotherapy? Researchers will compare participants' symptoms before and after a chemotherapy cycle with Snoezelen sessions, and contrast these with data from the previous cycle without Snoezelen.

Participants will:

* Be enrolled between their first (without Snoezelen) and second (with Snoezelen) chemotherapy cycles * Complete self-report questionnaires assessing anxiety (GAD-7, SCARED), depression (CDI), quality of life (PedsQL), and nausea (BARF scale) * Receive 45-minute Snoezelen sessions every two days during their second hospitalization for chemotherapy * Participate in a semi-structured research interview after the final Snoezelen session The study will also collect data on medications administered (anxiolytics, antiemetics) and the frequency of vomiting episodes during hospitalization.

• Generalized Anxiety Disorder - GAD-7 [Срок оценки: Before the 2nd chemotherapy treatment, before the 1st Snoezelen session and At the end of the 2nd chemotherapy treatment and no more than 2 weeks after the last Snoezelen session = at 15 days and at 1 months]
• Anti-emetic treatments [Срок оценки: Periprocedural]
• Child-Self Report - PedsQL [Срок оценки: Before the 2nd chemotherapy treatment, before the 1st Snoezelen session and At the end of the 2nd chemotherapy treatment and no more than 2 weeks after the last Snoezelen session = at 15 days and at 1 months]
• Number of vomits [Срок оценки: Periprocedural]
• Anxiolytic treatments [Срок оценки: Periprocedural]
• BARF scale (Baxter Retching Faces) [Срок оценки: Before the 2nd chemotherapy treatment, before the 1st Snoezelen session and At the end of the 2nd chemotherapy treatment and no more than 2 weeks after the last Snoezelen session = at 15 days and at 1 months]
• Children's Depression Inventory - CDI [Срок оценки: Before the 2nd chemotherapy treatment, before the 1st Snoezelen session and At the end of the 2nd chemotherapy treatment and no more than 2 weeks after the last Snoezelen session = at 15 days and at 1 months]
• Child Anxiety Related Emotional Disorders - SCARED [Срок оценки: Before the 2nd chemotherapy treatment, before the 1st Snoezelen session and At the end of the 2nd chemotherapy treatment and no more than 2 weeks after the last Snoezelen session = at 15 days and at 1 months]