A contribution to the formation mechanism of calcium oxalate urinary calculi. IV. Experimental investigations of the intrarenal crystallisation of calcium oxalate in rabbit.

Rabbits were given glyoxylic acid to induce intrarenal calcium oxalate crystal formation. The point of crystallisation in the renal tubule, the structure and the composition of the intrarenal crystals were studied. The initial crystallisation takes place in the proximal tubule.

Scanning electron microscope and microprobe investigation of phosphate phases in uroliths.

In uroliths various phosphate phases can be detected which indicate different formation conditions. Structure and topography of the respective phosphate phases are characterized by scanning electron microscopy and microprobe techniques. Trace element enrichment is investigated and illustrated; for example, sulfur is found preferentially in carbonate apatite.

[Effect of ionizing energy on the bladder dilated by dura, with special reference to the implantation technic. Animal experimental study].

On 60 female rabbits we examined the influence of the postoperative irradiation on the urinary bladder dilated by liophilized human dura after resection of the wall. Compared with former examinations as to the implantation technique the submucous deposition of the dura and fixation with single-button U-sutures (chromic catgut 000) has proved as superior. Vascular trophic disturbances on the margins of the resection could not be proved.

[Various problems in urinary calculi].

After evaluation of the essential parameters concerning urinary calculi and patient with the help of adequate computer programmes in more than 30,000 persons some conspicious trends could be established. The necessity of operative removal of calculi is still relatively high in the most frequent species of calculi whewellite, weddellite, uric acid, struvite and carbonate apatite. Thus nearly 65% of all struvite and carbonate apatite calculi must be operatively removed in women.