Efficiency of EDAP LT-01 Machine on Shock Wave Lithotripsy for Urinary Stone by Method of Effectiveness Quotient

Kim, Tae Han; Kim, Dong Sun; Cho, Jae Heung

Abstract

It is somewhat difficult to evaluate the result of shock wave lithotripsy for urinary stone due to a variety of lithotripter machine, auxillary procedures and various criteria of successful treatment. So, we analyzed the results of extracorporeal shock wave lithotripsy (ESWL) for the various urinary stones using EDAP LT-01 machine by the method of Effectiveness Quotient( EQ). From February to October in 1992, 175 patients with urinary stone(renal 68, ureteral 117, bladder 1 : 186 organs) underwent ESWL in Korea University. The treatment was done on out-patient basis weekly or biweekly and average shock wave storage was 60 per session and average total storage was 181(20-143l). Completeness of treatment was defined as no stone density on plain film of KUB or ultrasonography. The result of l86 cases of ESWL treatment analyzed by stone free rate(SFR %) at 3months, retreatment, auxillary procedure and effectiveness quotient were 90.3%, 61.3%, 7.5%, 53.8%, respectively. As the size of the stone was increased, the EQ was decreased. Difference of EQ between lower calyceal stone from mid- upper calyceal stone was not seen. Hydronephrosis on the IVP of the ureteral stone patients were classified by 6 group by Fuchs's classification. Mild Hydronephrosis (I, II, III) has larger EQ than severe hydronephrosis(IV, V, VI). It seemed more efficient in mild hydronephrosis for ESWL. The result of EQ was lower than stone free rate in all cases but didn't show reversed result. So, considering of the advantages of ESWL such as non-invasiveness, the rate of retreatment or auxillary procedure should be included in analyzing the results of ESWL in spite obtaining of decreased success rate. Also EQ for the evaluation of the result of ESWL seems to be able to offer standardization among the various machines and circumstances.