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Sponsored by: |
University of Wisconsin, Madison |
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Information provided by: | University of Wisconsin, Madison |
ClinicalTrials.gov Identifier: | NCT00582972 |
The purpose of this study is to measure the effect of omeprazole on intestinal calcium absorption in postmenopausal women. Because older adults frequently take PPI, it is critical to understand the impact of PPI therapy on calcium homeostasis. In this study, I hypothesize that PPI therapy does not alter intestinal calcium absorption in postmenopausal women.
Condition | Intervention | Phase |
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Osteoporosis Achlorhydria GERD Hip Fracture |
Drug: Omeprazole |
Phase IV |
Study Type: | Interventional |
Study Design: | Non-Randomized, Open Label, Single Group Assignment |
Official Title: | Does Omeprazole Decrease Intestinal Calcium Absorption? |
Estimated Enrollment: | 20 |
Study Start Date: | January 2008 |
Estimated Study Completion Date: | December 2008 |
Estimated Primary Completion Date: | December 2008 (Final data collection date for primary outcome measure) |
Arms | Assigned Interventions |
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Experimental: Experimental
Subjects will receive omeprazole 40 mg daily for 30 days
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Drug: Omeprazole
40 mg po qAM one-half hour before breakfast for 30 days
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Existing literature makes it unclear whether PPI therapy truly decreases intestinal calcium absorption. Up to 25 postmenopausal women will participate in this two-month study. The primary study outcome is the change in intestinal calcium absorption following omeprazole therapy. The secondary outcomes include the change in urine n-telopeptide, the month-to-month variability in intestinal calcium absorption and the establishment of a DNA bank for genetic studies of calcium homeostasis.
We will interview women and review their medical records to determine eligibility. Eligible subjects will undergo three GCRC studies. The first 2 studies will determine the monthly variation in calcium absorption, while the 3rd study will occur after taking 40 mg of omeprazole daily for 30 days. Women will present to the GCRC in the early morning and receive an oral and intravenous calcium tracer with breakfast. Over the next 24 hours, we will collect all urine for measurement of its calcium content. During the first or second GCRC stay, we will measure each subject's gastric pH by collecting gastric fluid from a temporary nasogastric tube. In consenting subjects we will collect one tube of blood, isolate its DNA and save it indefinitely within the locked GRECC Drezner Laboratory (5th Floor, VA Hospital) permitting future genetic studies related to calcium homeostasis.
Genders Eligible for Study: | Female |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
Exclusion Criteria:
United States, Wisconsin | |
University of Wisconsin Hospital and Clinics | |
Madison, Wisconsin, United States, 53792 |
Principal Investigator: | Karen E Hansen, MD | Univeristy of Wisconsin School of Medicine and Public Health |
Responsible Party: | University of Wisconsin School of Medicine and Public Health ( Karen Hansen, MD ) |
Study ID Numbers: | H-2007-0179, 07-1235-03 |
Study First Received: | December 19, 2007 |
Last Updated: | June 2, 2008 |
ClinicalTrials.gov Identifier: | NCT00582972 |
Health Authority: | United States: Institutional Review Board |
Calcium Absorption Fractional Calcium Absorption Omeprazole |
Stable Calcium Isotopes Proton Pump Inhibitor Intestinal Absorption of Calcium |
Metabolic Diseases Gastrointestinal Diseases Fractures, Bone Wounds and Injuries Omeprazole Osteoporosis Disorders of Environmental Origin Bone Diseases, Metabolic Bone Diseases |
Calcium, Dietary Hip Fractures Femoral Fractures Stomach Diseases Digestive System Diseases Musculoskeletal Diseases Achlorhydria Leg Injuries Metabolic disorder |
Molecular Mechanisms of Pharmacological Action Therapeutic Uses Anti-Ulcer Agents Gastrointestinal Agents |
Enzyme Inhibitors Hip Injuries Pharmacologic Actions Acid-Base Imbalance |