TY - JOUR
T1 - Effect of skin-to-stone distance on shockwave lithotripsy success
AU - Jacobs, Bruce L.
AU - Smaldone, Marc C.
AU - Smaldone, Arlene M.
AU - Ricchiuti, Daniel J.
AU - Averch, Timothy D.
PY - 2008/8/1
Y1 - 2008/8/1
N2 - Purpose: We evaluated the effect of increased body habitus on stone-free rates after shockwave lithotripsy (SWL), determined by three reproducible skin-to-stone distances (SSDs) on CT. Patients and Methods: We retrospectively reviewed the records of 85 patients with preoperative CT scans available on Stentor Radiology Imaging who underwent SWL with the unmodified Dornier HM3 lithotripter from 2002 to 2007. SSDs were measured at the following angles: 0 degrees (vertical), 30 degrees, and 90 degrees (horizontal). Successful therapy was defined as stone free (residual fragments <2 mm) on follow-up imaging. Data were analyzed using descriptive statistics, Student t test, and the Fisher exact test. Results: Four hundred and eighty patients underwent SWL at our institution from 2002 to 2007; 85 patients (50.6% men, mean age 50.8 ± 15.7 years, mean body mass index [BMI] 28.8 ± 6.6 kg/m2) had preoperative CT scans available for review. On follow-up imaging (142.7 ± 217.2 days), 49.4% of patients were stone free. Mean SSDs (vertical, 30 degrees, horizontal) in patients who were stone-free v those with residual stone were 104.3 ± 26.2 mm v 102.6 ± 29.9 mm (P = 0.79), 103.9 ± 28.2 mm v 101.0 ± 31.5 mm (P = 0.66), and 106.6 ± 25.3 mm v 107.1 ± 29.3 mm (P = 0.94), respectively Conclusions: Multiple variables have been shown to be associated with SWL success. In our sample of patients with preoperative CT scans, SSD was found to have no effect on SWL success.
AB - Purpose: We evaluated the effect of increased body habitus on stone-free rates after shockwave lithotripsy (SWL), determined by three reproducible skin-to-stone distances (SSDs) on CT. Patients and Methods: We retrospectively reviewed the records of 85 patients with preoperative CT scans available on Stentor Radiology Imaging who underwent SWL with the unmodified Dornier HM3 lithotripter from 2002 to 2007. SSDs were measured at the following angles: 0 degrees (vertical), 30 degrees, and 90 degrees (horizontal). Successful therapy was defined as stone free (residual fragments <2 mm) on follow-up imaging. Data were analyzed using descriptive statistics, Student t test, and the Fisher exact test. Results: Four hundred and eighty patients underwent SWL at our institution from 2002 to 2007; 85 patients (50.6% men, mean age 50.8 ± 15.7 years, mean body mass index [BMI] 28.8 ± 6.6 kg/m2) had preoperative CT scans available for review. On follow-up imaging (142.7 ± 217.2 days), 49.4% of patients were stone free. Mean SSDs (vertical, 30 degrees, horizontal) in patients who were stone-free v those with residual stone were 104.3 ± 26.2 mm v 102.6 ± 29.9 mm (P = 0.79), 103.9 ± 28.2 mm v 101.0 ± 31.5 mm (P = 0.66), and 106.6 ± 25.3 mm v 107.1 ± 29.3 mm (P = 0.94), respectively Conclusions: Multiple variables have been shown to be associated with SWL success. In our sample of patients with preoperative CT scans, SSD was found to have no effect on SWL success.
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U2 - 10.1089/end.2008.0169
DO - 10.1089/end.2008.0169
M3 - Article
C2 - 18721043
SN - 0892-7790
VL - 22
SP - 1623
EP - 1627
JO - Journal of Endourology
JF - Journal of Endourology
IS - 8
ER -