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Stroke and MI in Users of Estrogen/Progestogen

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: NCT00005466
Recruitment Status : Completed
First Posted : May 26, 2000
Last Update Posted : February 18, 2016
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
To estimate the relative risks of acute myocardial infarction (MI) and of stroke in postmenopausal users of estrogen/progestogen (E/P) combinations and to estimate the relative risks of MI and of stroke in users of estrogen alone.

Condition or disease
Cardiovascular Diseases Heart Diseases Coronary Disease Cerebrovascular Accident Myocardial Infarction Postmenopause

Detailed Description:


Post-menopausal hormone use is becoming increasingly widespread based on evidence of the benefits of estrogen use for bone and the heart. However, because estrogen alone substantially increases the risk of endometrial cancer, estrogen users who have not undergone a hysterectomy are frequently also placed on a progestogen (E/P), a strategy that reduces the likelihood of endometrial cancer when compared with use of estrogen alone. In 1991, there were almost no data on the risk of cardiovascular disease in post-menopausal women who used E/P combinations.


The study had a case-control design, Cases were women hospitalized with MI or stroke in any of nine participating Northern California Kaiser Permanente hospitals in a 36 month period. For each case, one control, matched by year of birth, was selected at random from among members of the Kaiser Permanente Health Plan who were expected to use the same nine hospitals for their medical care. Information about use of estrogen, E/P combinations, past use of oral contraceptives, menopause, hysterectomy and oophorectomy, demographics, general health status, preventive health care, and cardiovascular risk factors were collected in interviews done of the subjects or, for fatal cases, a surrogate. Information about then current use of estrogen and E/P combinations were also gathered by reviewing medical records.

The investigators used conditional logistic regression analysis to estimate the relative risks of MI and of stroke in users of E/P combinations, taking into account prior oophorectomy and other potential confounders. They also estimated the risks of acute MI and of stroke in users of estrogen alone, accounting for prior oophorectomy and potential confounders.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.

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Study Type : Observational
Study Start Date : August 1991
Actual Study Completion Date : July 1995

Information from the National Library of Medicine

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

Layout table for additonal information Identifier: NCT00005466     History of Changes
Other Study ID Numbers: 4910
R01HL047043 ( U.S. NIH Grant/Contract )
First Posted: May 26, 2000    Key Record Dates
Last Update Posted: February 18, 2016
Last Verified: May 2000
Additional relevant MeSH terms:
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Heart Diseases
Myocardial Infarction
Coronary Disease
Cardiovascular Diseases
Pathologic Processes
Myocardial Ischemia
Vascular Diseases
Cerebrovascular Disorders
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases