Comparing magnesium sulfate doses in obese patients during surgery

Best Dose of Magnesium Sulfate Infusion in Obese. A Blind and Randomized Trial

Phase 3 Interventional University of Sao Paulo General Hospital · NCT04645719

This study is testing whether giving different amounts of magnesium sulfate based on actual or ideal body weight can help manage pain better for obese patients during surgery.

Quick facts

PhasePhase 3
Study typeInterventional
Enrollment75 (estimated)
Ages18 Years to 60 Years
SexAll
SponsorUniversity of Sao Paulo General Hospital Academic / other
Locations2 sites (São José Dos Campos, SP and 1 other locations)
Trial IDNCT04645719 on ClinicalTrials.gov

What this trial studies

This clinical trial investigates the optimal dosing of magnesium sulfate for analgesia in obese patients undergoing laparoscopic, bariatric, or cholecystectomy surgery. It aims to compare the effects of magnesium sulfate administered based on actual body weight versus corrected ideal body weight. A total of 75 participants will be randomly assigned to one of three groups: a control group receiving only general anesthesia, a group receiving magnesium sulfate based on real weight, and a group receiving it based on corrected ideal weight. The study seeks to determine which dosing strategy provides better pain management and outcomes for obese patients.

Who should consider this trial

Good fit: Ideal candidates are obese patients aged 18 to 60 scheduled for laparoscopic, bariatric, or cholecystectomy surgery.

Not a fit: Patients with heart block, neuropsychiatric impairments, or those using illicit drugs may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could lead to improved pain management protocols for obese patients undergoing surgery.

How similar studies have performed: While magnesium sulfate has been used in various clinical settings, this specific dosing comparison in obese patients is novel and has not been extensively tested.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria: healthy patients, patients with controlled systemic disease (arterial hypertension, endocrine disease), obese patients.

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Exclusion Criteria: heart block, illicit drugs use, with neuropsychiatric impairment, in blockers calcium channels and with renal impairment

Where this trial is running

São José Dos Campos, SP and 1 other locations

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions ObeseAnalgesia
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.