Biomedical subjects

W Diederichs

Publications and source records attributed to W Diederichs.

22 records · Page 2Linked to original sources

PubMed1989

[Percutaneous treatment of a renal pelvis-calyx cholesteatoma].

A 54-year-old women reported recurrent pain in one side. Radiological and ultrasonographic examination revealed a mass in the left renal pelvis and the lower calyx. With percutaneous calycopyeloscopy keratinous fragments of a cholesteatoma were found and extracted during the same procedure. Up to now, malignant degeneration of a cholesteatoma has never been reported in the literature. Therefore, a conservative surgical treatment is acceptable.

Cholesteatoma↗

PubMed1988

Long-term followup in 1,003 extracorporeal shock wave lithotripsy patients.

We evaluated 1,003 patients treated with extracorporeal shock wave lithotripsy after a mean followup of 19.1 months (range 12 to 26 months). Followup excretory urograms were normal in 97 per cent of the patients. Two-thirds of the patients reported further discharge of residual fragments, mainly during the first 3 months. Rehospitalization was necessary in 57 patients. Over-all, the rate free of stones after followup was 72.2 per cent and it was not different for primary and recurrent stone patients. Rates free of stones were influenced mainly by the primary stone location and the number of stones in a renal unit. Patients with lower caliceal stones had a rate without calculi of only 57.8 per cent. Almost identical results were obtained for stones other than in the lower calix, when fragments were found in the lower calix at the time the patient was discharged from the hospital. The pre-treatment stone volume, as determined by measuring the stone area in square millimeters, did not influence the final rates free of stones for calculi up to 400 mm.2, that is 2.4 cm. of a sphere. Only calculi larger than 400 mm.2 showed an inverse relationship to the final rate free of stones. Multiple stones yielded a success rate of 64 per cent, with 90 per cent of the patients having regrowth of residual fragments. Serious complications during followup were not encountered.

Adolescent↗

PubMed1988

The diagnosis of venogenic impotence: dynamic or pharmacologic cavernosometry?

In an attempt to refine the diagnosis of venogenic impotence, we evaluated different techniques of cavernosometry in 10 dogs. Saline was perfused intracavernously in five dogs to induce erection. Regardless of the amount required for induction, a mean flow rate of 23.4 ml./min. was necessary to maintain an intracavernous pressure level of 110 cm. H2O. In seven dogs, a leak was created by intracavernous insertion of a 19-gauge needle. When erection was induced by either cavernous nerve stimulation or a combination of papaverine injection and saline perfusion, the mean flow through the needle was significantly less than when erection was induced by saline perfusion alone (1.73, 1.78, and 8.77 ml./min., respectively). Sympathetic trunk stimulation at the level of L5 could reduce the intracavernous pressure by 90% in erections induced by neural stimulation or papaverine plus perfusion but had no effect on erection induced by saline perfusion alone. Our findings show that cavernosometry after intracavernous injection of papaverine will provide more valuable information in patients in whom venogenic impotence is suspected.

Animals↗

PubMed1988

The rationale for pharmacologic cavernosography.

To refine the diagnostic method for opacification of aberrant venous drainage in venogenic impotence, an experimental study was done in eight monkeys. In all monkeys, cavernosography after induction of erection by saline perfusion showed significant drainage via the cavernous veins. However, when cavernosography was performed after neurostimulation or papaverine injection, no cavernous drainage was visualized, even when the intracavernous pressure had been significantly lowered by creation of an artificial cavernous leak. Because erection can result from saline perfusion only when the volume perfused exceeds the venous outflow capability, cavernosography during saline-induced erection will always demonstrate the entire venous system and, thus, is of no diagnostic value. Pharmacocavernosography imitates the physiologic venous occlusive mechanism and should therefore be used to identify the abnormally draining veins in venogenic erectile dysfunction.

Animals↗