Long-Term Follow-Up of Patients Treated by Percutaneous Ultrasonic Lithotripsy for Struvite Staghorn Calculi

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Abstract
Between October 1981 and June 1984, partial or total struvite staghorn calculi in 74 renal units in 68 patients were managed solely by percutaneous methods. There were residual stones in 12 kidneys at the time of hospital discharge. An average of 34 months of follow-up has been obtained in 80% of these patients. Of the eight evaluable kidneys in which residual stones were present, five had stone regrowth. All patients in this group had urinary infection. Five of these patients, including all with stone recurrence, had predisposing anatomic or metabolic factors. Of the 57 evaluable kidneys that were stone free at discharge, five (9%) had recurrent calculi. Ten patients had urinary infections. Again, there were predisposing factors in most patients with recurrent infection or stones. A struvite stone patient rendered stone free by percutaneous ultrasonic lithotripsy who is treated for any metabolic abnormalities has a 90% chance of remaining stone free for at least 3 years. The likelihood may be even greater in patients without predisposing anatomic abnormalities.