The impact of secondary hyperparathyroidism on the efficacy of antiresorptive therapy

Gyöngyvér Kincse, József Varga, Péter Somogyi, Péter Szodoray, Péter Surányi, János Gaál

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Background: The aim of the present study was to assess whether the efficacy of bisphosphonate treatment is influenced by PTH levels measured in newly diagnosed osteoporotic patients and to identify the threshold value, beyond which PTH level negatively influences therapeutic efficacy. Methods. One hundred and thirty-eight osteoporotic patients were enrolled into the study. All subjects underwent laboratory screening, bone densitometry with DEXA, and x-ray imaging. The changes in bone density were evaluated after a mean follow-up period of 13.37 ± 1.29 months. Correlation analysis was performed on the clinical data of patients, the percentage changes of BMD values, and the PTH levels measured at the beginning of study, using SPSS software. Results: The mean age of the subjects was 64.82 ± 10.51 years, and the female-to-male ratio was 116/22. Baseline BMD value measured with AP DEXA scanning was 0.854 ± 0.108 g/cm2 in the L1-4 vertebrae and 0.768 ± 0.115 g/cm2 in the left femoral neck. By the end of the follow-up period, these values changed to 0.890 ± 0.111 g/cm2 and 0.773 ± 0.111 g/cm2, respectively. We found a statistically significant, negative correlation between PTH levels and the percentage changes of lumbar BMD values measured at the end of the follow-up (correlation coefficient R2 = 0.121, p < 0.0001). The analysis of frequency histograms suggested that negative effects on bone might be expected above a PTH level of 60 pg/mL (7.3 pmol/L). Conclusion: Our findings imply that a baseline PTH level over 60 ng/mL can reduce the efficacy of bisphosphonate treatment.

Original languageEnglish
Article number244
JournalBMC Musculoskeletal Disorders
Volume13
DOIs
Publication statusPublished - Dec 28 2012

Keywords

  • Antiresorptive therapy
  • D vitamin status
  • Efficacy
  • PTH level

ASJC Scopus subject areas

  • Rheumatology
  • Orthopedics and Sports Medicine

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