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Effects of Vitamin D on Endometriosis-Related Pain: A Double-Blind Clinical Trial

Fariba Almassinokiani, Sepideh Khodaverdi, Masoud Solaymani-dodaran, Peyman Akbari, Abdolreza Pazouki

(Department of Obstetrics and Gynecology, Fellowship of Laparoscopy, Minimally Invasive Surgery Research Center, Iran University of Medical Sciences (IUMS), Tehran, Iran)

Med Sci Monit 2016; 22:4960-4966

DOI: 10.12659/MSM.901838


BACKGROUND: Endometriosis is a disabling disease of reproductive-age women. Dysmenorrhea, dyspareunia, and pelvic pain are the main symptoms of endometriosis. Its etiology is not clear. Endometriosis may have various causes, including vitamin D deficiency, but its effect is controversial.
MATERIAL AND METHODS: In this double-blind clinical trial, we enrolled patients with endometriosis diagnosed and treated by laparoscopy, with scores of at least 3 for of dysmenorrhea and/or pelvic pain at 8 weeks after surgical treatment. They were randomly prescribed vitamin D (50 000 IU weekly for 12 weeks) or placebo. Severity of pain in the 2 groups (placebo and treatment) was compared by VAS test at 24 weeks after surgical treatment.
RESULTS: There were 19 patients in the vitamin D group and 20 in the placebo group. Baseline characteristics in the 2 groups were similar. Following the treatment with vitamin D or placebo, we did not find significant differences in severity of pelvic pain (p=0.24) and dysmenorrhea (p=0.45) between the 2 groups. Mean pelvic pain at 24 weeks after laparoscopy in the vitamin D group was 0.84±1.74 and in placebo group it was 0.68±1.70 (p=0.513). Mean dysmenorrhea was 2.10±2.33 in the vitamin D group and 2.73±2.84 in the placebo group (p=0.45).
CONCLUSIONS: After ablative surgery for endometriosis, vitamin D treatment did not have a significant effect in reducing dysmenorrhea and/or pelvic pain.

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