Effects of PTH(1–84) therapy on muscle function and quality of life in hypoparathyroidism: results from a randomized controlled trial

Springer Science and Business Media LLC - Tập 25 - Trang 1717-1726 - 2014
T. Sikjaer1, L. Rolighed2, A. Hess3, A. Fuglsang-Frederiksen3, L. Mosekilde1, L. Rejnmark1
1Osteoporosis Clinic, Department of Internal Medicine and Endocrinology, MEA, Aarhus University Hospital, Aarhus, Denmark
2Department of Surgery P, Aarhus University Hospital, Aarhus, Denmark
3Department of Clinical Neurophysiology, Aarhus University Hospital, Aarhus, Denmark

Tóm tắt

The effects of treatment with 100 μg parathyroid hormone (PTH) (1–84) or an identical placebo on muscle function and quality of life (QoL) was studied in hypoparathyroid patients. At baseline, we found reduced QoL but no myopathy in the patients. Six months of treatment did not improve QoL, and muscle strength decreased slightly. A reduced quality of life (QoL) and myopathy that may be due to the absence of PTH have been reported in patients with hypoparathyroidism (hypoPT). Sixty-two patients with chronic hypoPT were randomized to 6 months of treatment with either PTH(1–84) 100 μg/d s.c. or placebo, given as add-on therapy to conventional treatment. Muscle function and postural stability were investigated using a dynamometer chair, a stadiometer platform, the repeated chair stands test, the timed up and go test, and electromyography. QoL was assessed using the 36-item Short Form Health Survey and the WHO-5 Well-Being Index. The mean age of the patients was 52 ± 11 years, and 85 % were females. At baseline, QoL was significantly reduced in comparison with norm-based scores. Compared with placebo, PTH did not improve QoL or muscle function. Rather, max force production decreased significantly by 30 % at elbow flexion in the PTH group compared with the placebo group. Moreover, there was a nonsignificant trend for muscle strength to decrease in the upper extremities and on knee extension in response to PTH. Treatment did not affect postural stability. Electromyography showed a slight decrease in the duration of motor unit potentials in the PTH group, indicating a tendency toward myopathy, which, however was not symptomatic. Overall, our data do not support an immediate beneficial effect of PTH replacement therapy on muscle function or QoL. A high frequency of hypercalcemia among our patients may have compromised the potential beneficial effects of reversing the state of PTH insufficiency.

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