Pharmacogenomics and Post-Operative Nausea and Vomiting


  • Study type

  • Study phase

  • Study IDs

  • Describes the nature of a clinical study. Types include:

    • Observational study — observes people and measures outcomes without affecting results.
    • Interventional study (clinical trial) — studies new tests, treatments, drugs, surgical procedures or devices.
    • Medical records research — uses historical information collected from medical records of large groups of people to study how diseases progress and which treatments and surgeries work best.
  • During the early phases (phases 1 and 2), researchers assess safety, side effects, optimal dosages and risks/benefits. In the later phase (phase 3), researchers study whether the treatment works better than the current standard therapy. They also compare the safety of the new treatment with that of current treatments. Phase 3 trials include large numbers of people to make sure that the result is valid. There are also less common very early (phase 0) and later (phase 4) phases. Phase 0 trials are small trials that help researchers decide if a new agent should be tested in a phase 1 trial. Phase 4 trials look at long-term safety and effectiveness, after a new treatment has been approved and is on the market.

  • Site IRB
    • Rochester, Minnesota: 17-011283
    NCT ID: NCT03503292
    Sponsor Protocol Number: 17-011283

About this study

The Researchers overall goal is to evaluate the benefit and utility of preemptive genotypic data to guide post-operative nausea and vomiting treatment in the bariatric surgical population. The hypothesis is that using genotypic variation in CYP2D6 to select the appropriate 5HT3 serotonin receptor antagonist to treat PONV will decrease rates of PONV in the bariatric surgical population.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. If you need assistance understanding the eligibility criteria, please contact the study team.

See eligibility criteria

Inclusion Criteria

  • A Mayo Clinic patient scheduled to undergo any bariatric surgical procedure, including Roux-en-Y gastric bypass, sleeve gastrectomy, or duodenal switch.
  • Patient age 18 or above.
  • Patients must understand and provide written informed consent and HIPAA authorization prior to initiation of any study-specific procedures.
  • Patient is willing to engage in a medication adjustment as part of their clinical visit (when needed).

Exclusion Criteria

  • Patient with uncontrolled concurrent illness including psychiatric illness, or situations that would limit compliance with the study requirements or the ability to willingly give written informed consent.
  • Any patient who will be unable to have genetic testing at minimum of 1 week  prior to scheduled surgery or with allergies to ondansetron or granisetron.
  • Any patient with prior pharmacogenomics testing that is readily available in the medical record will be excluded from this study.
  • Any patient that is pregnant.

Participating Mayo Clinic locations

Study statuses change often. Please contact us for help.

Mayo Clinic Location Status Contact

Rochester, Minn.

Mayo Clinic principal investigator

Yvette Martin McGrew, M.D., Ph.D.

Open for enrollment

Contact information:

Anita Stoltenberg R.R.T., L.R.T.


More information


Publications are currently not available

Study Results Summary

Not yet available

Supplemental Study Information

Not yet available


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