Early diagnosis of thyrotoxic periodic paralysis: Spot urine calcium to phosphate ratio

Shih H. Lin, Pauling Chu, Chih J. Cheng, Shi J. Chu, Yi J. Hung, Yuh Feng Lin

研究成果: 雜誌貢獻文章同行評審

35 引文 斯高帕斯(Scopus)


OBJECTIVES: To identify a clinically reliable index of thyrotoxic periodic paralysis (TPP), a life-threatening emergency with unique and effective therapies. DESIGN: Diagnostic study. SETTING: University teaching hospital. PATIENTS: Fifty-three consecutive patients with hypokalemic paralysis during a 3-yr period and 30 thyrotoxic patients without paralysis as the thyrotoxic control group. INTERVENTIONS: For patients with hypokalemic paralysis, blood and second-void spot urine samples were obtained and measured by routine laboratory prior to therapy. For the thyrotoxic control group, blood and spot urine were collected when they visited outpatient clinics. MEASUREMENTS AND MAIN RESULTS: Twenty-nine patients fulfilled the criteria for TPP. Compared with the thyrotoxic control group, the TPP group had significant decreases in plasma potassium (K) and phosphate concentrations associated with very low urine K and phosphate excretion. Compared with the non-TPP group, the TPP group had significantly lower plasma creatinine and phosphate levels, a significantly higher urine calcium to creatinine ratio (0.25 ± 0.12 vs. 0.08 ± 0.07 mg/mg, p <.001), and a significantly lower urine phosphate to creatinine ratio (0.08 ± 0.05 vs. 0.31 ± 0.23 mg/mg, p <.001). The urine calcium to phosphate ratio had greater discriminatory power between TPP and non-TPP hypokalemic paralysis (4.1 ± 2.3 vs. 0.5 ± 0.6 mg/mg, p <.001). Using a urine calcium to phosphate ratio cutoff value of 1.7 mg/mg, sensitivity and specificity for TPP were 100% and 96%, respectively. CONCLUSIONS: Hypercalciuria and hypophosphaturia are characteristic features of TPP.

頁(從 - 到)2984-2989
期刊Critical Care Medicine
出版狀態已發佈 - 12月 2006

ASJC Scopus subject areas

  • 重症監護和重症監護醫學


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