Impact of Cardiac Coherence on Anxiety in Patients Operated on for a Peritoneal Carcinosis

Inclusion Criteria: 1. Age over 18 years 2. Patients with peritoneal carcinosis awaiting cytoreductive surgery 3. Patients who scored strictly above 3 on the visual analogue anxiety scale and/or the psychological distress scale 4. Patients with sufficient command of the French language 5. Patient affiliated to a French social security system 6. Patient hospitalized at the Institute of cancer of Montpellier the day before his cytoreductive surgery (at T1 = D-1) 7. Signing of informed consent before any specific trial procedure Exclusion Criteria: 1. Patients who already have daily practice of cardiac coherence 2. Presence of proven psychiatric disorders (e.g., mental retardation, psychotic disorders, learning disabilities, attention deficit/hyperactivity, bipolar disorder, etc.) other than mood disorders that are reactive to the disease experience, or receiving psychotic treatment that may impair thinking, judgment or discernment 3. Physical or sensory inability to respond to questionnaires 4. Patients who have had a heart transplant or bypass surgery in the Year before surgery 5. Patient with a history of uncontrolled neurological pathology within the last 6 months before inclusion in the trial 6. Patients with a history of psychoactive substance dependence (excluding smoking) in the last 6 months before inclusion in the trial 7. Patients with brain metastases 8. Known natural bradycardia 50 beats per minute 9. Beta-blocker intake in progress 10. Ongoing cardiac arrhythmias 11. Known severe heart failure with ventricular ejection fraction strictly Below 40 % 12. Chronic uncontrolled pain and making it difficult to practice the technique 13. Patient with chronic obstructive pulmonary disease 14. Legal incapacity (patient under guardianship or curatorship)