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Introduction: The triad of hypercalcemia, metabolic alkalosis, and acute kidney injury associated with ingesting high doses of calcium and absorbable bases characterizes the calcium-alkali syndrome. Clinical Case. We report the case of a patient with postthyroidectomy hypoparathyroidism 15 years ago due to differentiated thyroid cancer who presented with severe hypercalcemia. He had adequate control of calcemia for many years on treatment with calcitriol and calcium carbonate and hypertension treated with amlodipine, losartan, and hydrochlorothiazide. After a period of loss to follow-up, he suddenly presents with severe hypercalcemia, metabolic alkalosis, and loss of renal function. Upon hydration and withdrawal of calcitriol and calcium replacements, hypercalcemia resolved. The etiological investigation identified no granulomatous or neoplastic diseases, but an aldosterone-producing adrenal incidentaloma was found. The cause of hypercalcemia in this patient was calcium-alkali syndrome due to calcium carbonate replacement potentiated by hydrochlorothiazide and primary aldosteronism. Six months after the hospitalization and suspension of calcium and vitamin D, the patient returned to hypocalcemia, reinforcing the diagnosis. Conclusion: Although seldom described, the calcium-alkali syndrome is an expected complication for individuals with postoperative hypoparathyroidism, as they require lifelong calcium and vitamin D supplementation. This case also shows the importance of hydrochlorothiazide use and primary aldosteronism as possible triggers of life-threatening hypercalcemia.
RESUMEN
UNLABELLED: Postmenopausal women with a high risk of fractures may not perceive their risk. This study showed no concordance between the perceived and calculated risk of fracture. Almost 80 % of the women identified as a high risk of fracture by the FRAX algorithm tool perceived themselves to have little risk. PURPOSE: This study aimed to assess the concordance between self-perception of osteoporosis and fracture risk and the 10-year risk of fractures calculated by the FRAX algorithm. METHODS: A cross-sectional study was conducted in Santa Maria, RS, Brazil, between March 1 and August 31, 2013. Postmenopausal women over 55 years of age who have had at least one appointment at primary care in the 2 years prior to the enrolment were recruited. We excluded women with cognitive impairment. A standardized questionnaire regarding the perception of personal risk of osteoporosis and fractures was used. We also evaluated previous fractures, family history of fracture, smoking, alcohol consumption, use of glucocorticoids, and secondary causes of osteoporosis. Weight and height of the participants were measured. The risk of fractures of each participant was calculated using the FRAX algorithm (Fracture Risk Assessment Tool). RESULTS: Of the 1301 invited women, 1057 completed the survey. The average (mean [SD]) age and BMI were 67.2 (7.6) years and 29.3 (5.5) kg/m(2), respectively. Only 16.9 and 19.9 % participants believed themselves to be at a high risk of osteoporosis and fractures, respectively. There was no agreement between the perceived risk of fractures and the calculated FRAX risk of fractures. Moreover, almost 79.3 % of the women identified with a high risk of fractures by the FRAX algorithm perceived themselves as having little risk. CONCLUSION: These results show that postmenopausal women underestimate their risk of osteoporotic fractures when compared with their 10-year fracture risk according to FRAX algorithm.
