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II Reunión Nacional del Grupo de Trabajo en Osteoporosis

II Reunión Nacional del Grupo de Trabajo en Osteoporosis

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7 aspectos prácticos<br />

<strong>en</strong> patología metabólica ósea<br />

boletín<br />

GTO...<br />

y cols. [28] realizaron un estudio <strong>en</strong> mujeres sanas postm<strong>en</strong>opáusicas<br />

<strong>en</strong> las que se valoró las ingestas <strong>de</strong> sodio<br />

y calcio para <strong>de</strong>terminar la relación <strong>en</strong>tre las excreciones<br />

<strong>de</strong> ambos; <strong>en</strong>contraron que la alta ingesta <strong>de</strong> sodio (con<br />

una mayor excreción r<strong>en</strong>al <strong>de</strong> sodio) produce hipercalciuria,<br />

lo cual a su vez está modulado por la ingesta <strong>de</strong><br />

calcio, <strong>de</strong> manera que dietas <strong>de</strong> 1000 mg/día <strong>de</strong> calcio<br />

hac<strong>en</strong> más fuerte dicha relación.<br />

Por último, los fitatos también se han <strong>de</strong>stacado como<br />

elem<strong>en</strong>tos dietéticos con un papel <strong>en</strong> la patog<strong>en</strong>ia <strong>de</strong> la<br />

formación <strong>de</strong> cálculos [29]. Curhan y cols. [30] <strong>en</strong>cu<strong>en</strong>tran<br />

que la ingesta <strong>de</strong> fitatos está asociada a un reducido<br />

riesgo <strong>de</strong> LR.<br />

Recom<strong>en</strong>daciones higiénico-dietéticas <strong>en</strong> el<br />

tratami<strong>en</strong>to <strong>de</strong> la LR.<br />

Con la única excepción <strong>de</strong> la HC absortiva tipo I, <strong>en</strong> la<br />

que la restricción <strong>de</strong> calcio <strong>en</strong> la dieta es obvia [31], no<br />

existe motivo alguno para imponer a los paci<strong>en</strong>tes litiásicos<br />

una ingesta cálcica por <strong>de</strong>bajo <strong>de</strong> las cantida<strong>de</strong>s<br />

normalm<strong>en</strong>te recom<strong>en</strong>dadas. Múltiples estudios han<br />

<strong>de</strong>mostrado que una ingesta baja <strong>en</strong> calcio no sólo no<br />

previ<strong>en</strong>e la formación <strong>de</strong> cálculos [32], sino que, como<br />

ya hemos visto, la favorece; a lo cual añadiríamos su<br />

efecto negativo <strong>en</strong> el balance óseo.<br />

Una alta ingesta <strong>de</strong> agua y fibra, suplem<strong>en</strong>tos <strong>de</strong> potasio<br />

y álcalis, con una dieta baja <strong>en</strong> proteínas animales<br />

y sal, y un control <strong><strong>de</strong>l</strong> peso son medidas que la mayor<br />

parte <strong>de</strong> las veces son sufici<strong>en</strong>tes para evitar la recurr<strong>en</strong>cia<br />

<strong>de</strong> la LR [33,34,35], a<strong>de</strong>más <strong>de</strong> estar protegi<strong>en</strong>do<br />

al hueso <strong>de</strong> alteraciones <strong>en</strong> su metabolismo<br />

mineral [36,37]. En aquellos casos <strong>en</strong> que sea necesario,<br />

pue<strong>de</strong> establecerse un tratami<strong>en</strong>to farmacológico,<br />

que, con la única excepción m<strong>en</strong>cionada más arriba,<br />

nunca será acompañado <strong>de</strong> una restricción <strong>en</strong> la<br />

ingesta <strong>de</strong> calcio.<br />

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BOLETÍN GTO

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