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Relationship between fractional calcium absorption and gastric emptying
J M Wishart1, M Horowitz, H A Morris
1Department of Medicine, Royal Adelaide Hospital, South Australia.
European Journal of Clinical Investigation
|February 1, 1995
Summary
This study found that radiocalcium absorption is not significantly affected by gastric emptying rate in postmenopausal women. A single blood sample method for measuring calcium absorption is as precise as using multiple samples.
Area of Science:
- Nutritional Science
- Radiopharmacology
- Gastroenterology
Background:
- Calcium absorption is crucial for bone health, particularly in postmenopausal women.
- Gastric emptying rate can influence nutrient absorption.
- Accurate measurement of fractional calcium absorption is essential for clinical and research purposes.
Purpose of the Study:
- To evaluate the relationship between calcium absorption and gastric emptying.
- To assess the precision of a single-isotope technique for measuring fractional calcium absorption.
Main Methods:
- 14 postmenopausal women received a drink containing 45Ca, paracetamol, and 99mTc sulfur colloid.
- Gastric emptying was monitored using a gamma camera.
- Fractional calcium absorption was calculated from blood samples and correlated with gastric emptying data.
Main Results:
- Radiocalcium absorption showed high correlation between study days (r=0.89) and between different calculation methods (r=0.93).
- Early gastric emptying correlated with plasma paracetamol levels (r=0.42).
- Calcium absorption was inversely related to gastric emptying (r=0.45).
Conclusions:
- Gastric emptying rate does not significantly influence radiocalcium absorption.
- A single blood sample method offers comparable precision to multi-sample methods for assessing calcium absorption.