Journal of the Chinese Medical Association
Volume 71, Issue 10 , Pages 496-501, October 2008

Predictive Factors of Lower Calyceal Stone Clearance After Extracorporeal Shockwave Lithotripsy (ESWL): The Impact of Radiological Anatomy

  • Chih-Chieh Lin

      Affiliations

    • Division of Urology, Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C.
    • ,
  • Yen-Shen Hsu

      Affiliations

    • Division of Urology, Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C.
    • Department of Urology, National Yang-Ming University School of Medicine, Taipei, Taiwan, R.O.C.
    • Corresponding Author InformationCorrespondence to: Dr Yen-Shen Hsu, Division of Urology, Department of Surgery, Taipei Veterans General Hospital, 201, Section 2, Shih-Pai Road, Taipei 112, Taiwan, R.O.C.
    • ,
  • Kuang-Kuo Chen

      Affiliations

    • Division of Urology, Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan, R.O.C.
    • Department of Urology, National Yang-Ming University School of Medicine, Taipei, Taiwan, R.O.C.

Received 7 August 2008; accepted 2 September 2008.

Article Outline

Background

This study was carried out to determine whether or not there is a significant relationship between the radiologic anatomy of the lower calyx, as seen on preoperative intravenous urography (IVU), and the outcome of stone clearance after extracorporeal shockwave lithotripsy (ESWL) for lower renal calyceal stones.

Methods

Between June 1998 and April 2007, 112 patients with a solitary lower renal calyceal stone measuring 20 mm or less in size were enrolled in this retrospective study. Pretreatment IVU was reviewed for measuring the anatomical predictors, such as lower pole infundibular length, infundibular width (IW) and infundibulopelvic angle, while the stone location and size were determined on plain abdominal X-ray. All patients were treated with ESWL using a Siemens Lithostar Plus lithotriptor and were followed-up for the outcome of stone clearance 3 months after ESWL with plain abdominal X-ray films and ultrasonography.

Results

Three months after ESWL, only 49 (43.7%) patients were stone-free. Under multivariate analysis with logistic regression, smaller stone size (10 mm or less, p = 0.005) and greater IW (4 mm or more, p = 0.029) were significant favorable predictors for better stone clearance.

Conclusions

In addition to the influence of stone size, lower pole anatomy, especially IW, has a significant impact on stone clearance for lower calyceal stone after ESWL.

Key Words:  extracorporeal shockwave lithotripsy , infundibulopelvic angle , kidney , stone clearance , urolithiasis

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PII: S1726-4901(08)70157-6

doi:10.1016/S1726-4901(08)70157-6

Journal of the Chinese Medical Association
Volume 71, Issue 10 , Pages 496-501, October 2008

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