[Scanning electron microscopy analysis of peroperative injury at the junctions of the vasa vasorum and the collateral veins of venous autografts prepared for myocardial revascularization]. / Scann-elektronskomikroskopska analiza peroperativnih ostecenja utoka vasa vasorum i kolateralnih vena venoznog autotransplantata pripremljenog za revaskularizaciju miokarda.

The authors' objective was to determine the peroperative changes in affluences of collateral veins and vasa vasorum of venous autografts prepared for a coronary bypass by standard and proposed methods. The investigations were carried out on dogs. In control group, the veins were prepared by the standard method where the vein is presented by several minor incisions with "skin bridges" planted in between. In the second group, the veins were prepared by the method developed by the authors, where the vein is presented by a long incision, maintaining perfusion with its own blood throughout surgery. The scanning electron microscope analysis has shown that the standard method of vein preparation causes significant damage in collateral veins and vasa vasorum affluences which are actually part of an internal surface of future venous autograft prepared for myocardium revascularization. The proposed surgical method considerably reduces possible peroperative damage of the vasa vasorum and collateral vein affluence sites forming a portion of the internal surface of the venous autograft. Therefore, based on the obtained results, this method is recommended for clinical application.

[Use of the free venous auto-transplant of the "patch" type in the prevention and treatment of ureteral stenoses. Experimental study with emphasis on the functional value of the operation]. / Upotreba slobodnoga venoznoga auto-transplantata oblika "patcha" u prevenciji i lijecenju stenoza uretera. Eksperimetalni rad sa osvrtom no funkcionalnu vrijednost operacije.

The author analyze the problems of transplantation of the free venous auto-transplant which they implant in the milieu of the urinary system at the location of a previously intentionally performed defect on the side of the ureter. Distinctively, they examine the functional value of such an operation. The experimental model was chosen as the ureter of a dog. A free venous auto-transplant, elliptical in shape (patch) with standard dimensions 2cm-6mm is built in a defect of the ureter side. Fifteen days after the operation an intravenous urography is done, while is repeated after four months. The findings of the urography show consistent values. Four months after the operation in order to check the functional value of the operation a dynamic scintigraphy of the kidneys together with computer data processing is done. An intravenous injection is given to the dogs of 25 micro Curie Hipurin (ortho-iod-hippuric acid labeled with J131). Following this, the dogs are put under a Gamma camera (LFOV - Searle), while registers a accumulation of activity. The results are expressed by a dynamic graph; from which it is easily seen that part of the graph, which relates to the disappearance of activity is almost identical with the graph of the non-operated half of the urinary system. This shows the functional equivalence of the operated and non-operated sides. Such good functional results are obtained in all trials. All together 6 dogs are operated and a total of 8 operations are performed. The results of this work, as well as the clinical experience of other author allow us to propose the application of the free venous auto-transplant (patch), in the cure and prevention of the stenosis of the ureter of the shorter segment at specific indications.