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RecruitingNCT06350955IVORYUpdated Aug 20, 2024

IV Iron-induced Hypophosphatemia After RYGB

A Phase 4 interventional study of Iron isomaltoside and Iron Carboxymaltose in Hypophosphatemia and Roux-en-Y Gastric Bypass, sponsored by Lucie Favre. Recruiting at 1 site in Switzerland. Open to participants aged 18 Years to 99 Years. Per ClinicalTrials.gov, last updated 2024-08-20.

Sponsored by Lucie Favre · Phase 4, Interventional, and Treatment

From the registry’s dates

  • Primary completion was expected by Jun 2026, 5 months ago, but the record still lists the study as recruiting.
  • Started May 2024; still recruiting 2 years 6 months later.
Phase
Phase 4
Study type
Interventional
Enrollment
94
Allocation
Randomized
Ages
18 Years to 99 Years
Sex
All
01

Study summary

The primary objective of the study is to compare the incidence of hypophosphatemia in RYGB patients treated with intravenous (IV) single dose of iron isomaltoside (Monofer®) or ferric carboxymaltose (Ferinject®).

02

Conditions studied

  • Hypophosphatemia
  • Roux-en-Y Gastric Bypass

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03

In context

Hypophosphatemia

53 studies on the registry are indexed under Hypophosphatemia; 16 are open to participants now.

This study's planned enrollment of 94 is above the median of 46 across 26 interventional studies indexed under Hypophosphatemia.

Browse Hypophosphatemia studies →

Lead sponsor

This is the only study on the registry with Lucie Favre as lead sponsor.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 99 Years
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Patients over 18 years
  • Signed
  • Patients with previous RYGB surgery performed > 12 months ago
  • Failed response to oral iron supplementation
  • Established diagnosis of iron deficiency by ferritin \< 50 ug/l or serum ferritin ≤100ug/l and low transferrin saturation (TSAT) ≤ 30%
  • Normal phosphate blood level (0.8 - 1.45 mmol/l) before infusion
  • Normal magnesium blood level (0.65-1.05 mmol/l)
  • Outpatient

Exclusion criteria

Exclusion Criteria:

    • Patients with known to iron preparation and/or anaphylaxis from any cause
  • Patients for whom a treatment with one of the IV iron is (based on product summary of product characteristics)
  • Women who are pregnant or breastfeeding
  • Intention to become pregnant during the course of the study
  • Renal failure, chronic kidney disease stage 3b or worse ( ≤ 45 ml/min/1.73m2)
  • Patients who received IV iron infusion during the last 3 months before screening
  • Treatment with erythropoietin or erythropoietin-stimulation agents, red blood cell transfusion within the last 3 months prior to screening
  • Alcohol or drug abuse within the past 6 months
  • Planned surgical procedure within the clinical trial period
  • Surgery under general anaesthesia within the last 3 months prior to screening
  • Hyperparathyroidism
  • Kidney transplantation
  • Inability to follow study procedures or give
  • Use and inability to stop from V0 to study end, phosphate supplementation (except daily multivitamin preparation recommended after bariatric surgery; the exact amount of phosphate and iron supplementation in the daily multivitamin will be recorded)
  • Osteoporosis drug therapy (bisphosphonates, denosumab or selective oestrogen receptor modulators).
  • Patient who refuses to be informed of incidental discoveries that may contribute to the prevention, diagnosis, and treatment of existing or probable future illnesses.
Terms in these criteria, in plain language(4)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

Hypersensitivity

An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.

Contraindication

A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.

GFR and eGFR (kidney filtering)

GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².

Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.

05

Study design

Phase
Phase 4
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Single (Participant)
Enrollment
94 participants (estimated)

Study arms

  • Experimental
    Patients with Roux-en-Y gastric bypass and iron deficiency 1

    Drug: Iron isomaltoside

  • Experimental
    Patients with Roux-en-Y gastric bypass and iron deficiency 2

    Drug: Iron Carboxymaltose

Interventions

06

What researchers measure

Primary outcomes

  1. incidence of hypophosphatemia in RYGB patients treated with intravenous iron

    Time frame: day 14 ± 2, 21 ± 2 and 28 ± 2

07

Study locations

1 of 1 sites recruiting
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Aug 20, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT06350955
Lead sponsor
Lucie Favre
Responsible party
Lucie Favre (Co-director of the Obesity Center, CHUV, Centre Hospitalier Universitaire Vaudois) — Sponsor-investigator
First posted
Apr 8, 2024
Start date
May 2, 2024
Primary completion
Jun 2026 (estimated)
Completion
Jun 2026 (estimated)
Last update
Aug 20, 2024

Oversight

FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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Discussion

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Studies of the drugs tested here: Iron isomaltoside 1000 · Ferric carboxymaltose

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