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Shen L et al, 2011: Comparison of Efficacy of German and Chinese Electromagnetic Shock Wave Lithotripters: Dornier Compact S vs Huikang MZ-SWL-V

Shen L, Sun X, Cong X, Wang Y, Zhu H, He L
Department of Urology, the Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical School, Nanjing 210008, People's Republic of China


Abstract

OBJECTIVES: To compare the treatment efficacy of Dornier Compact S and a Chinese electromagnetic shock wave lithotripter (Huikang MZ-SWL-V) in a large series.

METHODS: We retrospectively reviewed the outcome of shock wave lithotripsy (SWL) in 13,954 consecutive patients with upper urinary tract stones from December 1996 to December 2008 with Dornier Compact S (9124 cases) and Huikang MZ-SWL-V (4830 cases). An intramuscular injection of 50 mg pethidine was given to the patients with Dornier Compact S but not to those with Huikang MZ-SWL-V. Treatment outcomes were assessed by the stone-free rate at three months, the retreatment rate, the auxiliary procedure rate, and the effectiveness quotient. The pain scores were evaluated by visual analog scales, where 0 = pain and 10 = unbearable pain.

RESULTS: The overall stone-free rate at 3 months, retreatment rate, and ancillary procedure rate for Dornier Compact S were 95.9%, 13.4%, and 2.2%, respectively, and they were 85%, 29.6%, and 10.2%, respectively, for Huikang MZ-SWL-V. The overall efficiency quotients of Dornier Compact S and Huikang MZ-SWL-V were 83% and 60.8%, respectively. However, the pain scores in the Dornier group (6-10) were higher than those in the Huikang group (1-5). Three clinically significant subcapsular hematomas were detected in the Dornier group but there were none in the Huikang group.

CONCLUSIONS: Dornier Compact S is more effective than Huikang MZ-SWL-V, but SWL with Huikang machine could be performed with milder pain and without analgesia, and a lower significant hematoma rate was observed in Huikang group.

Copyright © 2011 Elsevier Inc. All rights reserved.
Urology. 2011 Dec;78(6):1240-3. doi: 10.1016/j.urology.2011.04.061. Epub 2011 Jul 20
PMID: 21777956 [PubMed - as supplied by publisher]

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Comments 1

Hans-Göran Tiselius on Friday, 23 September 2011 07:31

This comparison of the two electromagnetic litotripters Dornier Compact S (D) and Huikang MZ-SWL-V (H) - used in the treatment of almost 14,000 patients (!) - was in favour of the previous one. There are, however, some other observations in this report that might be of interest to emphasize.

With the lower shockwave power in the H-lithotripter no hematomas were observed. The stone-free rate with D was better than that reported in other studies, an effect that the authors relate to the lower BMI in Chinese patients. The authors also mention that the experience of the operator might have played a role, a factor that I personally believe is highly likely.

The bottom-line of this report is that with a low shockwave power, the need of re-treatments is increased, but the overall treatment results are quite acceptable.

Hans-Göran Tiselius

This comparison of the two electromagnetic litotripters Dornier Compact S (D) and Huikang MZ-SWL-V (H) - used in the treatment of almost 14,000 patients (!) - was in favour of the previous one. There are, however, some other observations in this report that might be of interest to emphasize. With the lower shockwave power in the H-lithotripter no hematomas were observed. The stone-free rate with D was better than that reported in other studies, an effect that the authors relate to the lower BMI in Chinese patients. The authors also mention that the experience of the operator might have played a role, a factor that I personally believe is highly likely. The bottom-line of this report is that with a low shockwave power, the need of re-treatments is increased, but the overall treatment results are quite acceptable. Hans-Göran Tiselius
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