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Clinical audit of a new extracorporeal shockwave lithotripsy machine
Author(s) -
Lo Alex HakKeung,
Au YukWa
Publication year - 2014
Publication title -
surgical practice
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.109
H-Index - 10
eISSN - 1744-1633
pISSN - 1744-1625
DOI - 10.1111/1744-1633.12041
Subject(s) - medicine , extracorporeal shockwave lithotripsy , asymptomatic , surgery , urinary system , lithotripsy , urology
Objective To evaluate the effectiveness and safety of the newly installed ESWL machine ( S torz M odulith SLX‐F2 ) in the treatment of urinary tract stones. Methodology All patients who had been treated with urinary tract stone (larger than 5 mm in size) by the newly installed ESWL machine in 2009 to 2010 were included. Patients' demographic data, target stone characteristics, patients' discomfort and treatment outcomes were prospectively collected. Treatment was considered a success if the patient was stone free or had asymptomatic, unobstructed stone fragments less than 4 mm. Results 329 patients were analysed. M : F = 2.6:1. Age ranged from 24 to 81. 135 patients had renal stone and 194 patients had ureteric stone. Their stone size ranged from 5–36 mm, mean 8.7 mm. 92.7% of the target stone were radio‐opaque and 56.7% of the stones had obstructive effect. 76.3% of them had their procedures performed under sedoanalgesia. 95.4% of the target stones were localized by X ‐ray. The no. of shocks given per treatment ranged from 1000 to 4000 shocks. The overall single session success rate was 88.1% (Complete stone clearance: 64.4%; CIRF : 23.7%). The single session success rate / complete stone clearance rate for renal and ureteric stone was 84.4%/40% and 93.3%/81.4% respectively. Stone size was the only pre‐treatment factor associated with the treatment outcome (p = 0.010). 79.9% and 2% of the patients complained minor symptoms on D 1 and D 14 respectively. Conclusion Storz M odulith SLX‐F2 lithotripter is effective and safe in the treatment of urinary tract stones.