Treatment of Vitamin D Insufficiency in Postmenopausal Women: A randomized clinical trial Journal Club 1/8/2016 Sharda Mukunda.

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Treatment of Vitamin D Insufficiency in Postmenopausal Women: A randomized clinical trial Journal Club 1/8/2016 Sharda Mukunda

Holick MF. N Engl J Med 2007;357: Synthesis and Metabolism of Vitamin D in the Regulation of Calcium, Phosphorus, and Bone Metabolism.

Background Renal production of active vitamin D Parathyroid hormone Circulating levels of Ca/Phos Effects on Renal calcium absorption Intestinal calcium and phosphorous absorption Bone Vitamin D deficiency  inc PTH  Osteoclasts  osteopenia/porosis

Patient Case 80 Haitian woman with uncontrolled hypertension. Has never had a fracture. Does not like to take medications 25-OH D level of 20 She declines vitamin D prescription How important is it for us to focus on her vitamin D?

Study Design Randomized, double blind, placebo controlled INCLUSIONEXCLUSION Age less than or equal to 75, postmenopausalAge >75- Intestinal resistance to vitamin D Baseline 25(OH)D level 14-27Osteoporosis (measured BMD), fragility, fracture of the hip, spine, or wrist 5 yrs or more past menopause/ oophorectomyHypercalcemia 60 yrs or older if they had prior hysterectomyNephrolithiasis Cancer within 5 yrs IBD, malabsorption, sprue, diarrhea CKD (GFR <45) Use of bone active meds within 6 months

Methods 230 Women randomized to 1.High dose cholecalciferol 50,000 IU q15 d (74 completed) 2.Low dose cholecalciferol 800 IU qd (74 completed) 3.Placebo (73 completed) All subjects received the same pills Yellow capsules = 50,000 IU White capsules = 800 IU 31 day prefilled boxes Only personnel who did not have contact with participants knew assignments

Methods Study visits 30, , 240, 365 days 1.Timed Up and Go (TUG) 2.5 Sit to stand tests (STS) 3.Pain reports on 10 point scale 4.Functional status 5.Physical Activity for the Elderly Scale 6.Adverse Events Urine calcium levels at 0, 60, 120, 240 (Total fractional calcium absorption, TFCA) Vitamin D levels- treated if high dose <30 Repeat BMD 1 yr after entrance into study

Calcium absorption studies Total Fractional Calcium Absorption (TFCA) Dual stable calcium isotope method IV isotope tracks renal reabsorption and endogenous fecal calcium excretion Fasted from midnight to 7AM Breakfast with a standardized with calcium isotope IV infusion of a DIFFERENT calcium isotope 24 hr urine collection TFCA is the ratio of the two isotopes found in the urine INCREASE in TFCA means you have better intestinal absorption

Outcomes 1.Primary outcome: 1 yr change in Total Fractional Calcium Absorption 2.Secondary outcome Change in BMD 3.Additional outcomes Effects on muscle function, muscle mass, trabecular bone score, and bone turnover 4.Pain, functional status, and physical activity

Results 25 (OH)D levels significantly different between the groups (<0.001) Placebo Low dose High dose

Adverse events

Other testing All treatment arms had slightly faster TUG and STS testing No between arm differences No between arm differences in: muscle mass number of falls number of fallers No between arm differences for 1 yr change in the health assessment questionnaire or physical activity for the elderly score

Conclusions High-dose cholecalciferol therapy increased calcium absorption, but the effect was small and did not translate into beneficial effects on bone mineral density, muscle function, muscle mass, or falls.

Validity Was the assignment of patients to treatment randomized? –YES How exactly were they randomized? Was the randomization concealed– YES Were the groups similar at the start of the trial—YES Was follow up sufficiently long– ONLY 1 YEAR Were all patients analyzed in groups to which they were randomized—YES Were patients, clinicians, and study personal kept blind to the treatment—YES Were groups treated equally—YES… received sham pills

Applicability 1.Is this study valid in our population? Do our patients fit in? Mean age ~60- how does this effect how we interpret? 89-90% White! 2.Is the treatment feasible? Negative trial- would be feasible to decrease vitamin D Rx in elderly postmenopausal women 3.What are our patient’s potential benefits and harms from the therapy? No significant harms; though recent studies differ 4.What are our patient’s values and expectations for both the outcome we are trying to prevent and the treatment?

Patient Case Age is 80 (mean age 60 in this study) Though increasing age associated with resistance to vitamin D effects in intestine She is Haitian Creole Perhaps she would not benefit from vitamin D treatment

Further considerations

References 1.Hansen, KE et al. “Treatment of Vitamin D Insufficiency in Postmenopausal Women: A randomized clinical trial.” JAMA Internal Med. 2015; 175 (10): Holick, MF. “Vitamin D Deficiency.” N Engl J Med 2001; 357: