Evaluación de causas secundarias de baja masa ósea en mujeres colombianas con osteoporosis posmenopáusica

Introducción: La osteoporosis posmenopáusica puede coexistir con otras entidades que aumentan la pérdida ósea.
Objetivo: Determinar la frecuencia de causas secundarias de baja masa ósea en mujeres con osteoporosis posmenopáusica en una población colombiana.
Diseño: Estudio descriptivo retrospectivo.
Población: Mujeres mayores de 50 años con diagnóstico reciente de osteoporosis posmenopáusica antes de iniciar tratamiento.
Mediciones: Se incluyeron variables demográficas, densitométricas y bioquímicas como hemoglobina, fosfatasa alcalina, transaminasas, creatinina, 25-hidroxivitamina D, calcio, fósforo, magnesio, calciuria en 24 horas, PTH y TSH.
Resultados: Se incluyeron 129 mujeres con edad promedio de 67+/-8,8 años. Cuarenta y nueve mujeres (36%) presentaban antecedente de fractura por fragilidad. En el 86,8% se encontró al menos una alteración bioquímica asociada con pérdida de masa ósea, documentándose insuficiencia de vitamina D en 71,8%, hiperparatiroidismo normocalcémico en 18,1% e hipercalciuria en 6,4%. Las mujeres con antecedente de fractura presentaron valor promedio de fosfatasa alcalina superior (111,6 +/- 61,3 vs 87,1 +/- 30,4 U/L, p= 0,0143) y promedio de hemoglobina inferior (12,9 +/- 1,2 vs. 14,2 +/- 1,2gr/dl, p<0,0001) al compararse con las mujeres sin fractura. Se encontró correlación inversa entre los niveles de fosfatasa alcalina y la densidad mineral ósea de la columna lumbar (p<0,001) y la cadera (p=0,003).
Conclusiones: Las causas secundarias de baja masa ósea en mujeres con OPM son frecuentes en nuestro medio. Con base en una frecuencia de alteraciones mayor al 5%, sugerimos la evaluación de toda mujer con OPM con hemoglobina, calcio, calciuria en 24 horas, 25-hidroxivitamina D, AST, PTH y TSH.

Abstract
Introduction: Postmenopausal osteoporosis can coexist with other entities that increase bone loss.
Aim: To determine the frequency of secondary causes of low bone mass in women with postmenopausal osteoporosis in a Colombian population.
Materials and methods: A retrospective descriptive study was conducted, including women over 50 years with newly diagnosed postmenopausal osteoporosis without treatment. Demographic, densitometric and biochemical variables such as hemoglobin, alkaline phosphatase, transaminases, creatinine, 25 hydroxivitamin D, calcium, phosphorus, magnesium, calciuria in 24 hours, PTH and TSH were evaluated.
Results: 129 women with a mean age of 67 +/- 8,8 years were included. 49 patients (36%) had history of fragility fracture. At least one biochemical disorder associated with bone loss was reported in 86,8% of cases, vitamin D insufficiency was documented in 71,8%, normocalcemic hyperparathyroidism in 18,1% and hypercalciuria in 6,4%. Women with history of fracture showed higher average value of alkaline phosphatase (111,6 +/- 61,3 vs 87,1 +/- 30,4 U/L, p=0,0143) and lower mean hemoglobin (12,9 +/- 1,2 vs 14,2 +/- 1,2 gr/dl, p<0,0001) compared with women without fracture. Inverse correlation was found between levels of alkaline phosphatase and bone mineral density of lumbar spine (p<0,001) and hip (p=0,003).
Conclusions: Secondary causes of low bone mass in women with PMO are frequent in our clinical practice. Based on a frequency of laboratory abnormalities greater than 5%, we suggest that all women with PMO should be studied with hemoglobin, serum calcium, urinary calcium in 24 hours, 25 hydroxivitamin D, AST, PTH and TSH.
Keywords: ; ; etiology;; .

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Osteoporosis posmenopáusica
fractura osteoporótica
etiología
densidad mineral ósea
deficiencia de vitamina D
hiperparatirodismo secundario
hipercalciuria
Postmenopausal osteoporosis
osteoporotic fracture
etiology
bone mineral density
vitamin D deficiency
secondary hyperparathyroidism
hypercalciuria