| Two Cases of Gitelman's Syndrome Diagnosed by
Renal Clearance Study |
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Tae Hwa Kim, Seung Jun Kim, Yu Kyung Seo, Jung-Yeon Shim, Hye Lim Jung, Moon Soo Park, Dong Hyuk Kum |
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Department of Pediatrics, Sungkyunkwan University, School of Medicine, Seoul, Korea |
| 신장청소검사를 이용하여 진단한 Gitelman 증후군 2례 |
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김태화, 김승준, 서유경, 심정연, 정혜림, 박문수, 금동혁 |
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성균관대학교 의과대학 소아과학교실 |
Correspondence:
Moon Soo Park, Email: parkms@kbsmc.co.kr
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| Abstract |
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Gitelman's syndrome is an autosomal recessive disorder characterized by hypokalemic metabolic alkalosis, hypomagnesemia, and hypocalciuria that has recently been reported to be linked to thiazide-sensitive Na-Cl cotransporter gene mutation. In this study, we performed renal clearance studies to differentiate Gitelman's from Bartter's syndrome and to confirm the diagnosis in two patients clinically diagnosed with Gitelman's syndrome. Each patient was hydrated by 20 mL/kg body weight of oral water within 30 minutes, which was followed by intravenous half saline. When urinary flow reached 10 mL/min, samples of urine and serum were obtained to calculate the osmolar clearance, free water clearance, chloride clearance, and distal fractional chloride reabsorption. Subsequently, furosemide or hydrochlorothiazide was administered. Samples were collected and the same parameters were calculated. In our patients, chloride clearance was increased more than 10 times after furosemide administration(2.1 : 25.7 and 2.2 : 27.4 mL/min/100 mL GFR), but not increased after hydrochlorothiazide treatment(2.1 : 1.6 and 2.2 : 2.6 mL/min/100 mL GFR). And the distal fractional chloride reabsorption was significantly decreased by furosemide injection (73% : 15% and 75% : 4.6%), whereas hydrochlorothiazide had no effect on it(73% : 63% and 75% : 78%). These findings indicate that our patients have a defect in thiazide-sensitive Na-Cl cotransporter in the distal tubule, which is compatible with the pathophysiology of Gitelman's syndrome. |
| Key Words:
Gitelman's syndrome, Renal Clearance Study |
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