Adverse Events With Magnesium Sulfate

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00005448
Recruitment Status : Withdrawn
First Posted : May 26, 2000
Last Update Posted : September 8, 2016
Information provided by (Responsible Party):
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
To investigate in pregnant women the adverse pulmonary effects of magnesium sulfate (MgSO4), a commonly used drug for tocolysis or arrest of labor.

Condition or disease
Lung Diseases

Detailed Description:


Preterm labor is a major public health concern in the United States. The delay of labor, particularly for idiopathic preterm labor, is important because it allows further fetal development and the opportunity to administer steroids which improve fetal lung maturity. It is now common for MgSO4 to be administered to delay labor. The most dangerous adverse event with MgSO4 treatment is the development of pulmonary edema which may lead to maternal adult respiratory distress syndrome and death with associated fetal morbidity and mortality. The estimates of the frequency of this complication vary from 0 to 8 percent. Therefore, improved understanding of the pulmonary toxicity of this therapeutic agent is clinically important.


There were three phases in the study. The first, a retrospective cohort study, examined the incidence rate of pulmonary edema when MgSO4 was administered as a tocolytic agent. The second, a case-control study nested within the cohort, examined the relationship between the patient and other clinical factors and the incidence of pulmonary edema in patients treated with MgSO4. The third phase used the results of the case-control study to develop and validate a predictive index to define a group of patients at increased risk of developing pulmonary edema associated with MgSO4.

Patients were identified using ICD-9-CM codes for preterm labor and delivery. The medical record was reviewed to determine exposure to MgSO4 as a tocolytic agent, excluding patients who received MgSO4 for other indications. Cases were defined as probable when patients met the clinical definition for pulmonary edema, including chest X-ray findings. The medical charts of both cases and a random sample of non cases were then reviewed in detail and the data from these groups were compared. The primary analysis of these case-control data included unadjusted analysis and multivariable explanatory models to provide insight into the risk factors for pulmonary edema associated with MgSO4. The data from the case-control study were used to develop a clinical predictive index. The predictive rule was then validated in a separate patient population.

Study Type : Observational
Actual Enrollment : 0 participants
Study Start Date : July 1996
Estimated Primary Completion Date : June 2002
Estimated Study Completion Date : June 2002

Information from the National Library of Medicine

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Ages Eligible for Study:   up to 100 Years   (Child, Adult, Senior)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No
No eligibility criteria

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00005448

United States, Pennsylvania
Hospital of the University of Pennsylvania
Philadelphia, Pennsylvania, United States, 19104
Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
OverallOfficial: George Macones University of Pennsylvania