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Biomedical subjects

R Böwering

Publications and source records attributed to R Böwering.

16 recordsLinked to original sources
PubMed1986

Use of the neodymium-YAG laser in the treatment of ureteral tumors and urethral condylomata acuminata. Clinical experience.

The further development of endoscopic instruments has made neodymium-YAG laser irradiation of ureteral tumors possible. To date a total of 13 ureteral tumors in 10 patients have been photocoagulated. Over a mean follow-up period of 23 months, only 1 heterotopic recurrence was found after 14 months. In view of the results achieved so far, nephroureterectomy as the first therapeutic step appears to have been made obsolete. Since 1979 we have treated 48 patients with the neodymium-YAG laser. Seven patients with excessive condyloma involvement were followed postoperatively. Our experience indicates that, in view of its low complication and recurrence rates, endoscopic laser coagulation of urethral condylomata is the method of choice. A short-term ureteroscopic follow-up examination, however, is required to detect any condylomata that might have been overlooked.

Adult↗
PubMed1985

[Treatment of superficial ureteral tumors using the neodymium-YAG laser].

Today NYG laser radiation can be combined with ureteroscopy for endoscopic staging as well as the treatment of ureteral tumors. In a small series of 10 patients, 13 ureteral tumors were laser-irradiated. The mean follow-up was 23 months. Only one heterotopic tumor recurred after 14 months. Therefore, we feel carrying out nephroureterectomy as the first therapeutic step is unnecessary and should be avoided.

Aged↗
PubMed1983

[Destruction of ureteral tumors with the neodymium-YAG laser. A new, organ-preserving surgical procedure].

Only the neodymium-YAG laser is suitable for destroying tumors endoscopically, because it shows a very high transmission through water and a slight absorption in the tissue. It means scattering becomes important and leads to a homogeneous and uniform distribution of the radiation in the tissue producing a deep thermal effect. An examination of a section through a bladder wall under light microscope after neodymium-YAG laser irradiation shows a layered, sharply delimited coagulation necrosis that extends to all of the bladder wall layers and reaches the outermost zones. In this way it is possible to destroy not only the exophytic part of a tumor but also the tumor base in the tissue. Since 1976 we destroyed more than 4000 bladder tumors by laser application. For tumors on the ureter or kidney pelvis a special endoscope, described by Perez-Castro Ellendt and modified by us, can be used, if it is not possible to perform a conventional operation. It is reported about four cases of distal ureter tumors (GI-II) in patients who had refused an operation for removing the tumor bearing ureter segments. Now, for more than one and half a year all patients are free of tumors and the irradiated ureters show a good function. This novel procedure is not for routine, but for high risk patients or patients, who refuse an open operation.

Aged↗
PubMed1981

Endoscopic Neodymium-YAG laser application for destroying bladder tumors.

302 bladder tumors to a size of a thumb tip were treated with a Nd: YAG laser. 196 large bladder tumors were removed by transurethral resection combined with laser irradiation 1 week later. In all cases tumors were classified as pTA to pT3a, No, Mo tumors. 8 weeks after treatment we found local recurrences in 9% using the rigid laser endoscopes. On the contrary, the local recurrence was 2.1% using laser endoscope with modified Albarran insert. In proven cases the Nd:YAG laser application is an effective and careful procedure to destroy bladder tumors.

Humans↗
PubMed1979

[The acute scrotum].

Explore the source record for details and available documents.

Diagnosis, Differential↗
PubMed1979

Interferometric laser holography for determination of the localization and extent of bladder tumor.

In male giant rabbits (n = 10) with and without bladder carcinomas, holographic interferometric investigations with a double impulse rubin laser were made for testing the sensitivity of this method in detection of elasticity changes of the bladder wall caused by tumors. It could be shown that the holographic interferometry enables a distinction to be made between healthy and tumorous regions of the bladder wall by the various interference patterns.

Animals↗