Effect of Clinical Hypnosis in Preoperative Anxiety Among Patients Undergoing an Abdominal Surgery.

Perioperative Anxiety (Primary Outcome) is measured using the Visual Analog Scale for Anxiety (EVA-Anxiété, 0-100 mm).

Primary Outcome Measure: preoperative anxiety level

Assessment Tool: 100-mm Visual Analog Scale (VAS-Anxiety):

0 mm = No anxiety ("Je ne suis pas du tout anxieux") 100 mm = Worst possible anxiety ("Anxiété maximale imaginable") Timepoints: (post-intervention, ~10 min later). Expected hypnosis effect: ≥10 mm reduction vs. control.

Protocol Specifications Patient marking: Single horizontal 100-mm line; mark position indicates intensity Scoring: Distance (mm) from "No anxiety" (0) to mark, precise to 1 mm

Secondary Outcome Measure: Acute postoperative pain intensity at 6, and 24 hours post-surgery.

Assessment Tool: 100-mm VAS-Pain Scale:

0 mm = No pain ("Aucune douleur") 100 mm = Worst imaginable pain ("Douleur maximale imaginable") Timepoints: T+6h, T+24h. Expected hypnosis benefit: ≥10 mm reduction vs. control .

Protocol Specifications Patient marking: Horizontal 100-mm line; precise mm measurement from 0 Analgesia standardization: Multimodal protocol identical across arms (paracetamol, NSAIDs, opioids rescue) Power: Secondary analysis leverages primary outcome sample (48-68 patients, 80% power for Δ=10 mm, σ=24 mm)

ClinicalTrials.gov Entry: "Postoperative pain intensity measured by 100-mm Visual Analog Scale at rest in PACU at 1, 2, 6, and 24 hours post-surgery"

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Secondary Outcome Measure: Anesthia drugs consumption and postoperative consumption of analgesics (morphine equivalents, paracetamol, NSAIDs, opioids) from PACU arrival to discharge.

Assessment Method:

Total mg/doses per patient, Data collection: Medication administration records (MAR), nurse logs Expected hypnosis effect: ≥20-30% reduction vs. control arm. Protocol Specifications

Standardized multimodal analgesia (identical both arms):

Secondary Outcome Measure: Time to hospital discharge (days) from surgery day (Day 0) to medical discharge order date.

Assessment Method:

Calendar days: Date of discharge hour date of surgery Expected hypnosis effect: ≥1 day reduction vs. control (typical LOS 3-5 days abdominal surgery).

Protocol Specifications

Standardized discharge criteria (identical both arms):

Tolerates solid diet VAS-pain ≤30 mm at rest Mobilizes independently to bathroom Afebrile, normal vital signs Data collection: medical record discharge order timestamp