[Severe osteoporosis - the story of chronic medication-related hyponatremia]

The authors present a case-report of a 73 years old woman treated for arterial hypertension within past 15 years with diuretics (thiazides, amiloride and indapamide) and concomitantly with antidepressive trazodone. The patient developed severe osteoporosis after 6 years of such a treatment with multiple fractures even after minor trauma; during whole this period severe hyponatremia without adequate supplementation was documented. Most probably, there exists tight relationship of osteoporosis and hyponatremia in this patient - the authors discuss possible pathophysiological mechanisms at the level of renal tubules, osteoblasts and osteoclasts, hypopituitary-skeletal axis, syndrome of inadequate adiuretin secretion (SIADH) and possible influence of acid-base balance disturbances.