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KMID : 0390320230330020053
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Chungbuk Medical Journal
2023 Volume.33 No. 2 p.53 ~ p.65
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Expectant management of large ureteral stones measuring 7?10 mm: Predictive factors for spontaneous passage rate and passage interval
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Kang Ho-Won
Kim Kyeong
Lee Woo-Suk
Moon Sung-Min
Lee Sang-Cheol
Ha Yun-Sok
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Abstract
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Purpose: Although shockwave lithotripsy or surgical removal is the preferred treatment for large ureteral stones measuring 7?10 mm, some stones spontaneously passed. We assessed predictive factors for spontaneous passage of large ureteral stones measuring 7?10 mm based on the experience of a single institution.
Materials and Methods: Data of 85 consecutive adult patients initially diagnosed by spiral computerized tomography with large ureteral stones measuring 7?10 mm in diameter and managed conservatively at our institution were retrospectively reviewed. Demographic and stone characteristics were compared between patients who experienced spontaneous passage and those who required intervention.
Results: Of the 85 patients with large ureteral stones measuring 7?10 mm, 37 (43.5%) passed their stones spontaneously after a mean (± standard deviation) of 13.1 ± 5.5 days. The likelihood of spontaneous passage was higher in patients with stones in the lower ureter than in patients with stones in the upper or mid-ureter (P < 0.001). Multivariate analysis revealed that stone location in the lower ureter was the only significant predictor of spontaneous passage (odds ratio, 8.138; 95% confidence interval, 2.464?26.877, P = 0.001). The time to spontaneous passage was shorter in patients with stones
measuring ≤ 8 mm than in patients with stones measuring > 8 mm (P = 0.022).
Conclusions: Despite the burden of large stones, 43.5% of patients with large ureteral stones measuring 7?10 mm passed their stones spontaneously. Stone location affected the success rate of spontaneous passage, while stone size was associated with passage interval.
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KEYWORD
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ureteral stone, conservative management, treatment outcome
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