Medical dissolution therapy for the treatment of uric acid nephrolithiasis.
INTRODUCTION
Uric acid (UA) nephrolithiasis represents 10% of kidney stones in the US with low urine pH and high saturation of UA as the main risk factors for stone development. Dissolution therapy for UA kidney stones via urinary alkalization has been described as a treatment option. We present our experience in treating UA nephrolithiasis with medical dissolution therapy.


METHODS
A retrospective review was performed of UA stone patients referred for surgery but treated with dissolution therapy between July 2007 and July 2016. Patients were identified using ICD-9 codes. Patients were treated with potassium citrate alone or in combination with allopurinol. Serial imaging and urine pH were obtained at follow-up. Demographics, aggregate stone size, time to stone clearance, urine pH (office dip), and complications were recorded.


RESULTS OBTAINED
Twenty-four patients (14 men and 10 women) were identified that started medical dissolution therapy for UA nephrolithiasis after initial referral for surgical management. Three patients (13%) did not tolerate the initiation of dissolution therapy and discontinued this treatment. Of the 21 patients that were maintained on dissolution therapy, 14 patients (67%) showed complete resolution of nephrolithiasis and 7 patients (33%) showed partial reduction. Patients with partial response had a mean reduction in stone burden of 68%. There were 3 recorded complications (UTI, GI upset with therapy, and throat irritation) and 4 recorded stone recurrences among these 21 patients.


CONCLUSION
Based on our study population, medical dissolution therapy is a well-tolerated, non-invasive option for UA nephrolithiasis.
['Gridley|Chad M|CM|', 'Sourial|Michael W|MW|', 'Lehman|Amy|A|', 'Knudsen|Bodo E|BE|http://orcid.org/0000-0002-2542-0330']
D000328:Adult D000368:Aged D000493:Allopurinol D005260:Female D006801:Humans D007669:Kidney Calculi D008297:Male D008875:Middle Aged D053040:Nephrolithiasis D019357:Potassium Citrate D012189:Retrospective Studies D014527:Uric Acid
Dissolution Uric acid Nephrolithiasis Alkalization