Hipovitaminosis D en pacientes hemodiálizados (HD): factores relacionados e influencia sobre la fuerza muscular

Introduction: 25(OH) vitamin D deficiency is a prevailing alteration in patients with chronic kidney disease (CKD); however, in our environment, it is not routinely measured and, therefore, vitamin replacement is unusual. Objective: Our purpose was assessing the prevalence of and the factors related to 25 (OH) vitamin D deficiency in patients with CKD in hemodialysis (HD), especially the relation to function and muscle mass. Methods: We conducted a prospective, multicenter study in adult patients on chronic HD who were not receiving any vitamin D derivative. Blood levels of 25(OH) D, Hemoglobin, CRP, Albumin, Ca, P, ALP and PTHi were measured. The handgrip strength was measured with a dynamometer and the sitting-rising test was carried out. A bioimpedance analysis (BCM, Fresenius Medical Care) was conducted in the patients who had no contraindications. Results: 138 patients were included. The levels of 25(OH) vitamin D were 20.43±10.5 ng/ml; the insufficiency/deficiency had 87% prevalence (and 37% prevalence with less than 15 ng/ml). Vitamin D concentrations/deficiency showed a significant correlation with/relation to age, diabetes, hemoglobin and albumin levels, muscle strength and mass, and functional class (p<0.05). Conclusions: High prevalence of hypovitaminosis D in patients on hemodialysis, particularly in the elderly and in patients with diabetes. This should be related to undernutrition, anemia, the functional class and the muscle strength/mass of patients, the latter two being unreported factors until now. All these factors should be considered when vitamin replacement is conducted and when its effectiveness is assessed.