Study to Evaluate the Efficacy of a Polyamine-deficient Diet for Treating Postoperative Pain After Abdominal Surgery (POLYAMAL)

  • days left to enroll
  • participants needed
  • sponsor
    Nantes University Hospital
Updated on 28 February 2022


The aim of this study is to evaluate if a polyamine deficient diet started 7 days prior to a major abdominal surgery (eventration cure and digestive continuity) and followed 7 days post-surgery reduces the area under the curve of the numerical pain rating scale in the 72 hours post-surgery.


Morphine derivatives are known to be a major cause of postoperative ileus and also operative hyperalgesia. Operative hyperalgesia corresponds to an increase in morphine needs postoperatively which is proportional to the morphine dose necessary during the surgery. This effect is due to two mechanisms: opioids tolerance and induced hypersensitivity.

N-methyl-D-aspartate receptors (R-NMDA) play a key role in this induced hypersensitivity. Polyamines, organic compounds with several amines functions, are known R-NMDA agonists. They increase the phosphorylation of the tyrosine group within the NR2B subunit responsible for the inflammatory hyperalgesia.

Limiting the binding of polyamines to the R-NMDA seems an easy, safe and efficient way to limit the hypersensitivity induced post-operatively.

Most of the polyamines in the human body come from food. One study listed food regarding their polyamines content and allowed to check the safety of a polyamine deficient diet. Such a well-followed diet would allow to reduce by 20 the polyamines quantity present in the body.

The aim of this study is to evaluate whether a deficient polyamine diet introduced 7 days before and continued up to 7 days after an abdominal surgery requiring the use of morphine post-operatively reduces the post-operative pain, the consumption of analgesics (morphine) post-operatively and improve the recovery ability. Abdominals surgeries concerned will be the eventration cure and digestive continuity.

The medico-economic impact will be observed during this study.

Condition Digestive System Surgical Procedures
Treatment Polyamine Deficient Diet
Clinical Study IdentifierNCT04219956
SponsorNantes University Hospital
Last Modified on28 February 2022


Yes No Not Sure

Inclusion Criteria

Adult (>18 years)
Indication for a " major " abdominal surgery as second surgical procedure : cure of eventration and restoration of digestive continuity
Intended Use of a Patient Controlled Morphine Pump (PCA) postoperatively or taking oral opioids
Possible follow-up during 7 months (post-operative consultation at 1 month and 6 months only if postoperative pain or complications)
Written informed consent form obtained from the patient
Affiliated to the social security

Exclusion Criteria

Pregnant women
Minor, adult under guardianship or benefiting from a legal protection
Oncological surgery
Surgery not painful (cholecystectomy, hernia, thyroidectomy, bariatric surgery)
Drug addicts patients, or under opiate dependency
Chronic pain patients (pain over 3 months)
Patients in nursing home or convalescence home (diet non possible in institution)
Planned hospitalisation before the intervention (during the 7 days before the surgery)
Severe undernutrition defined by the HAS criteria (weight loss > 10% in 1 month and/or > 15% in 6 months, albumin at inclusion <15g/l)
Patient refusing the possibility to change his eating habits
Oral feeding impossible preoperatively
Patient not able to express himself on their pain (silent, )
Decompensated psychiatric pathologies (severe depression syndrome,)
Patient unable to understand the protocol and/or to give his informed consent
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