Leaving small kidney stones behind causes problems later

Removal of the secondary stones reduced patients' relapse rate by 82%, urology researchers found
Leaving small kidney stones behind causes problems later  (representational image - Unsplash)
Leaving small kidney stones behind causes problems later (representational image - Unsplash)

When surgeons remove patients' kidney stones, they typically leave behind small stones that appear not to be causing problems.

A new randomized controlled study showed, however, that leaving these asymptomatic stones behind significantly increases the risk of a patient's relapse in the following five years. The findings were published in the New England Journal of Medicine.

When surgeons remove patients' kidney stones, they typically leave behind small stones that appear not to be causing problems.  (representational image - Unsplash)
When surgeons remove patients' kidney stones, they typically leave behind small stones that appear not to be causing problems. (representational image - Unsplash)

Generally, stones under 6mm in diameter that are not a procedure's primary target are not removed but monitored because “secondary” stones have high rates of successful passage if they move into the ureter, said lead author Dr. Mathew Sorensen, a urologist at the University of Washington School of Medicine.

Leaving small kidney stones behind causes problems later  (representational image - Unsplash)
Real-world data links rosuvastatin with signs of kidney damage

“Before this study, the clinical views were pretty mixed on whether some of these stones should be treated,” he said. “Most clinicians would decide, based on the size of the stone, whether it hit the bar for treatment, and if it did not, you would often ignore the little stones.”

The investigators studied the 75 patients who were treated at multiple institutions over a span from 2015 to 2021. About half of the patients had only their large primary stone treated, while the others had primary and secondary stones removed. Relapse was defined as having to go to the emergency room or undergo an additional procedure due to a recurrence or if a follow-up CT scan showed that the secondary stones grew.

Leaving small kidney stones behind causes problems later  (representational image - Unsplash)
Doctors perform an 'Auto-Kidney Transplant' in New Delhi

Removal of the secondary stones reduced the relapse rate by 82%, the researchers found, leading the authors to recommend that smaller stones should not be left behind.

“Results of our trial support the removal of small asymptomatic renal stones at the time of surgery with a larger stone,” their paper concluded. The authors noted that while removal of smaller stones could add to the procedure's duration and cost, those costs would likely be less than those associated with a patient's repeat procedure or visit to the emergency room. Some patients in the study visited the emergency department multiple times and then required surgery, the report noted.

Removal of the secondary stones reduced the relapse rate by 82%, the researchers found, leading the authors to recommend that smaller stones should not be left behind.  (representational image - Unsplash)
Removal of the secondary stones reduced the relapse rate by 82%, the researchers found, leading the authors to recommend that smaller stones should not be left behind. (representational image - Unsplash)

Sorensen said he would share the study results with colleagues with the hope of changing their sensibility toward smaller stones. Further study is needed to determine whether treatment of small stones alone is justified, as technology improves and the costs and risks of intervention diminish, he said.

Leaving small kidney stones behind causes problems later  (representational image - Unsplash)
How Covid directly infects, causes damage to human kidney cells

“I think we have proven through this rigorous study that removal of the small asymptomatic stones is beneficial when feasible and in patients that are candidates to have all their stones treated in one procedure,” he noted. “Leaving the stones behind risk trouble in the future.” (SP/Newswise)

Hurry up! Join the Medical Internship 3.0!

Related Stories

No stories found.
logo
Medbound
www.medboundtimes.com