Sometimes all it takes is a little push. That is the conclusion of a recently published study in which doctors used a handheld ultrasound device to nudge patients' kidney-stone fragments. As many as 50% of patients who have kidney stones removed surgically still have small fragments remaining in the kidneys afterward.
Of those patients, about 25% find themselves returning for another operation within five years to remove the now-larger fragments. UW Medicine researchers have found, however, that patients who underwent the stone-moving ultrasound procedure had a 70% lower risk of such a recurrence. The Journal of Urology published the findings in August.
"I think the main takeaways of this study are removing fragments reduces relapse and using a noninvasive, hand-held ultrasound device to help clear these kidney stone fragments," said UW Medicine urologist Dr. Jonathan Harper, the study's senior author. The multisite, randomized and controlled trial was conducted from May 2015 to April 2024.
Almost all of the 82 participants were from the UW Medicine or the VA Puget Sound health systems. All had stone fragments that had persisted in their kidneys for months, and their ureters were free of stones and fragments. In the study, 40 people underwent ultrasound treatment to encourage fragments to clear from the kidneys, while 42 control-group members received no such treatment.
With patients awake in a clinic office setting, doctors used a wand that generated ultrasonic pulses throug.