[Arterial embolectomy in the extremities. Results in 66 cases].
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Adolescent↗
Biomedical subjects
R Arcas
Publications and source records attributed to R Arcas.
[Experimental study of a new circular semiprosthesis for mitral and tricuspid valve replacement].
The experimental behaviour of a new semiprosthesis for mitral and tricuspid ring plasty is studied. The tolerance of the materials of which the ring is composed was realized by inserting it into the right atrium with hypothermia and occlusion of the cavas, in dogs which were permitted to live 6 months. It was shown that the ring was covered by a very thin, white membrane, with uniform characteristics and strongly attached. The histologic and the ultrastructural study with the electronic microscope, showed proliferation of conjunctive tissue with abundant collaginous fibers. The free border of this covering presented endotheliazation with flat endothelial cells. The prosthetic material behaves as an inert body when there is no evidence of lymphocytes or polymorfonuclears.
Animals↗
Immunological aspects of sarcoidosis associated with true thymic hyperplasia.
A 34-year-old woman had a three-month history of a double mitral lesion. Chest radiographs disclosed a mediastinal mass. Thoracotomy was performed and multiple white nodules and an enlarged thymus were seen. Sarcoidosis and true thymic hyperplasia were diagnosed in the excised white nodules and thymus. A decrease of cell-mediated immunity was also discussed. When commissurotomy of the mitral valve was performed 4 months later, sarcoidosis and true hyperplasia had disappeared and alterations of cell-mediated immunity became normal after a course of steroid therapy. The alterations of cell-mediated immunity, so frequent in sarcoidosis, could be related to true thymic hyperplasia.
Adult↗
[The implantable endocavitary cardioverter-defibrillator: the initial and short-term results].
Utilization of endocavitary defibrillation electrodes avoids thoracotomy used in implantable cardioverter-defibrillator procedures, reducing associated morbi-mortality. In our institution we have used this approach in 16 patients during a two years period (July 1990-July 1992). Fifteen were males, with a mean age of 56.9 +/- 10.6 (range 32-73). Nine patients suffered ischemic cardiomyopathy, 4 non ischemic cardiomyopathy and in three there was no structural heart disease. Mean ejection fraction was 44.3 +/- 18.3% (range 20-73%). Clinical arrhythmia was ventricular tachycardia in 8 cases, ventricular fibrillation in 6 cases and both types in 2. Endocavitary implantation procedure was not completed in 3 patients, thus an open trans-sternal approach was performed. In 13 patients it was completed successfully, using a total amount of 14 units (1 patient required two procedures due to sepsis in the generator pouch). Most important intraoperative incidences have been defibrillation thresholds between 20-24 J in 4 cases, displacement of defibrillation electrode from vena cava into coronary sinus in 4 cases, epicardial patch implantation via subcostal approach in 1 case and right ventricle perforation in 1 case. No operative mortality was registered. One patient suffered sudden death during follow-up. Surgical complications were few: 1 case of lead dislodgement and 1 infected wound in the generator's pouch. Non-surgical complications were also few: 1 case with superior vena cava syndrome and 1 patient with inadequate discharges. In conclusion, due to our early experience, we believe that endocavitary implantation of an implantable cardioverter-defibrillator is the procedure of choice at the present time.
Adult↗