Robert R. Recker, MD; K. Michael Davies, PhD; Rachel M. Dowd, RN; Robert P. Heaney, MD
Hormone replacement therapy (HRT), the mainstay of osteoporosis prevention, is limited because of dose-related risks, side effects, and patient acceptance. The bone-sparing efficacy and tolerability of the lowest available doses of HRT have not been adequately studied in elderly women.
To determine the bone-sparing effect of continuous low-dose HRT in elderly women.
Randomized, double-blind, placebo-controlled trial.
University osteoporosis research and clinical center.
128 healthy white women (age > 65 years) with low bone mass recruited by word of mouth and by local advertisement. The principal eligibility criterion was spinal bone mineral density of 0.90 g/cm2 or less.
Continuous therapy with conjugated equine estrogen, 0.3 mg/d, and medroxyprogesterone, 2.5 mg/d, or matching placebo. Sufficient calcium supplementation was given to bring all calcium intakes above 1000 mg/d in both groups; supplemental oral 25-hydroxyvitamin D was given to maintain serum 25-hydroxyvitamin D levels of at least 75 nmol/L in both groups.
Bone mineral density of the spine, hip, total body, and forearm; serum total alkaline phosphatase and serum osteocalcin levels at 6-month intervals; and 24-hour urine creatinine and hydroxyproline excretion at baseline, 12 months, and 42 months.
During 3.5 years of observation, spinal bone mineral density increased by 3.5% (P < 0.001) in an intention-to-treat analysis and by 5.2% among patients with greater than 90% adherence to therapy. Significant increases were seen in total-body and forearm bone density (P < 0.01). Symptoms related to HRT (breast tenderness, spotting, pelvic discomfort, and mood changes) were mild and short-lived.
Continuous low-dose HRT with conjugated equine estrogen and oral medroxyprogesterone combined with adequate calcium and vitamin D provides a bone-sparing effect that is similar or superior to that provided by other, higher-dose HRT regimens in elderly women. This combination is well tolerated by most patients.
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Recker RR, Davies KM, Dowd RM, Heaney RP. The Effect of Low-Dose Continuous Estrogen and Progesterone Therapy with Calcium and Vitamin D on Bone in Elderly Women: A Randomized, Controlled Trial. Ann Intern Med. 1999;130:897-904. doi: 10.7326/0003-4819-130-11-199906010-00005
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Published: Ann Intern Med. 1999;130(11):897-904.
Endocrine and Metabolism, Geriatric Medicine, Metabolic Bone Disorders.
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Print ISSN: 0003-4819 | Online ISSN: 1539-3704
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