The Etiology of Stone Formation in Patients with Surgically Active Urolithiasis
Patients with urinary calculi that are causing pain, colic, obstruction, and/or associated infection are considered to have surgically active urolithiasis (1). Their presenting complaints are often dramatic and require prompt surgical intervention to manage the acute problem and prevent long-term complications. A detailed metabolic evaluation of the patient at the point when he is in acute distress is often neither practical nor adequate. In particular, the results of urine chemistries in a 24-h urine collection may be inadequate because the patient is not taking his usual diet or fluids.
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