Dataset Information

Strategy for Calculating Magnesium Sulfate Dose in Obese Patients: A Randomized Blinded Trial.

ABSTRACT:

Background

Magnesium sulfate has analgesic properties during the postoperative period. However, there is a knowledge gap in pharmacology related to the use of the real, ideal, or corrected ideal body weight to calculate its dose in obese patients. This trial compared postoperative analgesia using actual and corrected ideal body weight.

Methods

Seventy-five obese patients scheduled to undergo laparoscopic gastroplasty or cholecystectomy under general anesthesia were randomly assigned to three groups. The patients in the control group did not receive magnesium sulfate; the other two groups received magnesium sulfate at 40 mg·kg^-1 of actual body weight or corrected ideal body weight.

Results

In patients with body mass index >30 mg·kg^-2 (mean body mass index ranging from 32.964 kg·m^-2 to 33.985 kg·m^-2, according to the groups) scheduled for video laparoscopic cholecystectomy, there were no differences in the blood magnesium concentrations in the groups receiving magnesium sulfate throughout the study, regardless of whether the strategy to calculate its dose was based on total or corrected ideal body weight. Patients in the groups receiving magnesium sulfate showed a significant reduction in morphine consumption (p ≤ 0.001) and pain scores (p=0.006) in the postoperative period compared to those in the control group. There were no significant differences in morphine consumption (p=0.323) or pain scores (p=0.082) between the two groups receiving magnesium sulfate. There were no differences in the total duration of neuromuscular block induced by cisatracurium among the three groups (p=0.181).

Conclusions

Magnesium sulfate decreased postoperative pain and morphine consumption without affecting the recovery time of cisatracurium in obese patients undergoing laparoscopic cholecystectomy. Strategies to calculate the dose based on the actual or corrected ideal body weight had similar outcomes related to analgesia and the resulting blood magnesium concentration. However, as the sample in this trial presented body mass indices ranging from 30.11 kg·m^-2 to 47.11 kg/m^-2, further studies are needed to confirm these findings in more obese patients, easily found in centers specialized.

SUBMITTER: Silva Filho SE

PROVIDER: S-EPMC9666020 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature

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Publications

Strategy for Calculating Magnesium Sulfate Dose in Obese Patients: A Randomized Blinded Trial.

Silva Filho Sebastião E SE Klinsky Omar S OS Gonzalez Miguel A M C MAMC Dainez Sandro S Angelis Flavio F Vieira Joaquim E JE

Anesthesiology research and practice 20221108

<h4>Background</h4>Magnesium sulfate has analgesic properties during the postoperative period. However, there is a knowledge gap in pharmacology related to the use of the real, ideal, or corrected ideal body weight to calculate its dose in obese patients. This trial compared postoperative analgesia using actual and corrected ideal body weight.<h4>Methods</h4>Seventy-five obese patients scheduled to undergo laparoscopic gastroplasty or cholecystectomy under general anesthesia were randomly assign ...[more]

PMID: 36398042

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Project description:BackgroundTo compare the benefits of magnesium sulfate for 24 h (h) postpartum versus 6 h postpartum in patients who received magnesium sulfate (Mg) for less than 8 h before birth.MethodsA randomized, multicenter, open study was conducted between November 2013 and October 2016 in three teaching maternity hospitals in Panama. Pregnant women diagnosed with severe pre-eclampsia or pre-eclampsia with severe features at more than 20 weeks gestation were invited to participate. They were randomized to the following groups in a 1:1 ratio: A- continue Mg for 24 h after birth (control group); and B- receive Mg for 6 h after birth (experimental group). The primary endpoint and variable was seizure (eclampsia) in the first 72 h postpartum.ResultsDuring the study period, 284 patients agreed to participate in the study; 143 were randomized to receive Mg for 24 h postpartum and 141 to receive Mg for 6 h postpartum. There were no significant differences in the baseline characteristics of the two groups studied. There was no eclampsia in the entire population; therefore, there was no significant difference in the primary variable. Two secondary variables showed a significant difference: time to onset of ambulation, which was 14 h shorter (p = 0.0001) in the group that received 6 h of postpartum Mg, and time to initiation of breastfeeding, which was 11 h earlier (p = 0.0001) in the group that received 6 h of postpartum Mg. There were not significant differences between the groups with respect to total complications or any particular complication. There were no cases of maternal death.ConclusionMaintaining Mg for 6 h postpartum is equally effective in preventing eclampsia as receiving Mg for 24 h postpartum in patients with severe pre-eclampsia who receive less than 8 h of Mg treatment before birth. The onset of maternal ambulation and initiation of breastfeeding are faster in patients who only receive Mg for 6 h postpartum.Trial registrationThe study was registered at clinical-trials.gov, number NCT02317146 . Date of registration: December 11, 2014. This study was registered at clinical trials after the beginning of recruitment of patients.

Project description:BackgroundIntracerebral hemorrhage (ICH) is the deadliest form of stroke. In observational studies, lower serum magnesium has been linked to more hematoma expansion (HE) and intracranial hemorrhage, implying that supplemental magnesium sulfate is a potential acute treatment for patients with ICH and could reduce HE. FAST-MAG (Field Administration of Stroke Therapy - Magnesium) was a clinical trial of magnesium sulfate started prehospital in patients with acute stroke within 2 hours of last known well enrolled. CT was not required prior to enrollment, and several hundred patients with acute ICH were enrolled. In this ancillary analysis, we assessed the effect of magnesium sulfate treatment upon HE in patients with acute ICH.MethodsWe retrospectively analyzed data that were prospectively collected in the FAST-MAG study. Patients received intravenous magnesium sulfate or matched placebo within 2 hours of onset. We compared HE among patients allocated to intravenous magnesium sulfate or placebo with a Mann-Whitney U. We used the same method to compare neurological deficit severity (National Institutes of Health Stroke Scale) and global disability (modified Rankin Scale) at 3 months.ResultsAmong 268 patients with ICH meeting study entry criteria, mean 65.4±13/4 years, 33% were female, and 211 (79%) had a history of hypertension. Initial deficit severities were median (interquartile range) of 4 (3-5) on the Los Angeles Motor Scale in the field and National Institutes of Health Stroke Scale score of 16 (9.5-25.5) early after hospital arrival. Follow-up brain imaging was performed a median of 17.1 (11.3-22.7) hours after first scan. The magnesium and placebo groups did not statistically differ in hematoma volume on arrival, 10.1 (5.6-28.7) versus 12.4 (5.6-28.7) mL (P=0.6), or HE, 2.0 (0.1-7.4) versus 1.5 (-0.2 to 8) mL (P=0.5). There was no difference in functional outcomes (modified Rankin Scale score of 3-6), 59% versus 50% (P=0.5).ConclusionsMagnesium sulfate did not reduce HE or improve functional outcomes at 90 days. A benefit for patients with initial hypomagnesemia was not addressed.RegistrationURL: https://www.Clinicaltrialsgov; Unique identifier: NCT00059332.

Dataset Information

Strategy for Calculating Magnesium Sulfate Dose in Obese Patients: A Randomized Blinded Trial.

Background

Methods

Results

Conclusions

Publications

Strategy for Calculating Magnesium Sulfate Dose in Obese Patients: A Randomized Blinded Trial.

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