Search

Your search keyword '"Vizza E"' showing total 459 results
Start Over Author "Vizza E"
459 results on '"Vizza E"'

110. Changes of ovarian microvasculature in hCG stimulated rabbits. A scanning electron microscopic study of corrosion casts

Author

Guido MACCHIARELLI, Nottola, S. A., Vizza, E., Correr, S., and Motta, P. M.

Subjects
Microcirculation, Ovary, Corrosion Casting, Chorionic Gonadotropin, Estrus, Ovarian Follicle, Corpus Luteum, Pregnancy, Models, Animal, Microscopy, Electron, Scanning, Animals, Female, Rabbits, Pseudopregnancy
Abstract

The microvasculature of the ovarian cortex was studied by means of scanning electron microscopy of vascular corrosion casts in estrous and hCG stimulated rabbits in order to establish a better understanding of the structural as well as functional vascular changes which accompany the evolution of the luteofollicular complex. According to the various shape and size seven different morphological types of vascular plexuses corresponding respectively to antral follicles (Types 1-2), atretic follicles (Types 3-4), periovulatory follicles (Type 5), growing pseudopregnant corpora lutea (Type 6) and regressing pseudopregnant corpora lutea (Type 7) were identified. Growing to mature cycling type follicles (Types 1-2) showed a gradual enlargement and proliferation of the theca capillaries. These changes, associated with capillary hyper-permeabilization were observed in ovulatory and post-ovulatory follicles (Types 5), after hCG stimulation. The corpus luteum formation (Types 6) was accompanied by additional capillary dilatation, diffuse angiogenetic sprouts and organization of a more conspicuous venous drainage. The regression of the corpus luteum (Type 7) was characterized by the appearance of avascular areas within the glandular tissue and by regression of vascular dilatation. The atretic follicle (Types 3-4) wall showed large interruptions (avascular areas) and focal invasion of the central cavity by newly formed capillaries randomly arranged. The hCG stimulation did not affect consistently the atretic follicle microvasculature. The present observation shows that both thecal capillary vasodilatation and angiogenetic processes support the gradual increase of ovarian blood flow during follicle growth and corpora lutea formation and that microvascular changes of atretic follicles are possibly related to a type of inflammatory reaction since they seem to be a consequence rather than a primary cause of atresia.

Published
1995

111. A Multicenter Phase II Randomized Trial of Docetaxel/Gemcitabine versus Docetaxel/Capecitabine as First-Line Treatment for Advanced Breast Cancer: A Gruppo Oncologico Italia Meridionale Study

Author

Vici, P., primary, Giotta, F., additional, Di Lauro, L., additional, Sergi, D., additional, Vizza, E., additional, Mariani, L., additional, Latorre, A., additional, Pizzuti, L., additional, D’Amico, C., additional, Giannarelli, D., additional, and Colucci, G., additional

Published
2011
Full Text
View/download PDF

148. How to increase the proportion of hysterectomies performed vaginally.

Author

Davies, Anthony, Vizza, Enrico, Davies, A, Vizza, E, Bournas, N, O'Connor, H, and Magos, A

Subjects
VAGINAL hysterectomy, GYNECOLOGY
Abstract

Objectives: The main purpose of our study was to identify the patient characteristics of women undergoing hysterectomy and to estimate the proportion of hysterectomies that could be done vaginally by recognized surgical techniques.Study Design: The records of 500 women who underwent hysterectomy were reviewed. The characteristics of patients without an absolute contraindication to vaginal hysterectomy were analyzed.Results: Overall, 96 (19.2%) of our study group underwent vaginal hysterectomy. A total of 382 (76.4%) women were judged not to have an absolute contraindication to this route. The most frequent characteristics of this group were lack of uterine prolapse (76.4%), a myomatous uterus (44.5%), and a need for oophorectomy (43.2%). We did not exclude women who did not have significant uterine prolapse or a history of pelvic surgery or pelvic tenderness and we included those requiring oophorectomy or with a uterine size up to that of 14 weeks' gestation; with these criteria more than two thirds of the entire study population could undergo vaginal surgery.Conclusions: To maximize the proportion of hysterectomies performed vaginally, gynecologists need to be familiar with surgical techniques for dealing with nonprolapsed uteri, uterine leiomyomas, and vaginal oophorectomy. [ABSTRACT FROM AUTHOR]

Published
1998
Full Text
View/download PDF

149. The three-dimensional organization of the smooth musculature in the ampulla of the human fallopian tube: a new morpho-functional model.

Author

Vizza, E, Correr, S, Muglia, U, Marchiolli, F, and Motta, P M

Subjects
SMOOTH muscle physiology, FALLOPIAN tube physiology, COMPARATIVE studies, ELECTROPHYSIOLOGY, FALLOPIAN tubes, HUMAN anatomical models, HYDROXIDES, RESEARCH methodology, MEDICAL cooperation, MUSCLE contraction, RESEARCH, SCANNING electron microscopy, SMOOTH muscle, EVALUATION research
Abstract

The three-dimensional organization of the smooth musculature around the human ampulla is revealed by means of scanning electron microscopy after NaOH maceration and ultrasonic microdissection of the interstitial connective tissue. The muscular wall of the ampulla appears as a continuous network of randomly anastomosed smooth muscle cell bundles that showed a multidirectional arrangement. The smooth muscle cell bundles modify their orientation along their course, intertwine repeatedly with each other and dichotomize, generating new bundles with a different orientation from that at the origin. These results demonstrate that the myosalpinx of the human ampulla is not organized into clear cut longitudinally, circularly or spirally arranged layers, as suggested in previous light microscopy studies. In contrast, the presence of a network of multidirectional smooth muscle cell bundles revealed in this study suggests that there is no morphological evidence for unidirectional peristalsis, and that the musculature is probably structurally designed to stir rather than push the tubal contents. These morphological findings better explain the random pattern of propagation of the contraction waves and the electrical impulses through the smooth musculature of the human ampulla, as postulated in early experimental physiological studies. Further, they suggest a specific function for the ampullar musculature which may not be only strictly related to tubal content transport. [ABSTRACT FROM AUTHOR]

Published
1995

Catalog

Books, media, physical & digital resources
See catalog results