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Results for “ARTERIOVENOUS ANASTOMOSIS”

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At least 19 recordsLinked to original sources
PubMed1983

Scanning electron microscopy of arteriovenous anastomosis in nasal respiratory mucosa.

Arteriovenous anastomosis (AVA) in nasal respiratory mucosa of humans and guinea pigs were studied with scanning electron microscopy (SEM) after removal of extracellular connective tissues by tryptic digestion and HCl hydrolysis. The shape of AVA in humans is different from that in guinea pigs. In guinea pigs, it is simple with no specific structure observed on the vessels. In humans, it is characterized by a spherical swelling at the intermediate segment. The Tunica media of the spherical body is formed by the aggregation of spindle-shaped cells and receives a rich nerve supply. These findings suggest powerful contractility of human AVA compared with guinea pigs. Arteriovenous anastomosis in human nasal respiratory mucosa may strongly influence arterial blood flow into the cavernosus sinusoid and determine the characteristic microcirculatory pattern in human nasal mucosa.

Adult↗
PubMed1988

[Evaluation of the results of arterial reconstructions supplemented by the creation of an arteriovenous anastomosis].

Arterial reconstructions supplemented with arteriovenous anastomosis were studied experimentally. The ischemic changes in the operated dog limb were evaluated by various methods, including electronic diagnostic technique. When the diameter of arteriovenous anastomosis was equal to 40-60 per cent of arterial graft diameter, the best postoperative results were observed.

Animals↗
PubMed1994

Tissue transfer with a distal to proximal arteriovenous anastomosis for venous drainage: microcirculatory analysis on the rabbit ear model.

An experimental study was conducted to find out the survival mechanism of tissue transfers drained by distal to proximal arteriovenous fistulas in 22 rabbit ear chambers using a videorecording system. In the first experiment (n = 12) the rabbit earlobe was cut at the base to eliminate blood and lymphatic flow. The central artery was reanastomosed and an anterior marginal distal to proximal arteriovenous anastomosis was created. In the second experiment (n = 10) the anterior marginal artery was reanastomosed, and a central distal to proximal arteriovenous fistula was created. In the first experiment, constant blood flow was observed postoperatively in arterioles, venules, capillaries and arteriovenous shunts, while in the second experiment, no blood was observed in any vessels. In conclusion, capillary blood circulation was experimentally confirmed in a tissue transfer with distal to proximal arteriovenous anastomosis, and selection of arteries, one for reanastomosis and one for anastomosis to a vein for drainage, seems to be of critical importance for the success of this tissue transfer.

Anastomosis, Surgical↗
PubMed1976

Adrenergic and cholinergic innervation of the arteriovenous anastomosis in the rabbit's ear.

The distribution of adrenergic and cholinergic nerves in the arteriovenous anastomosis in the rabbit's ear was studied light microscopically using specific histochemical techniques for catecholamines and acetylcholinesterase. Histochemical observations was made with whole stretch preparations and cryostat or paraffin sections. Both kinds of nerves showed similar distribution, though the adrenergic innervation was denser than the cholinergic one. The intermediate segments of the anastomoses, which were characterized by a very thick wall, had the most dense innervation. The small arteries and arterial segments had a moderate innervation whereas most of the small veins and venous segments had few nerve fibers. The segmental variation in the vasomotor nerve supply clearly suggests that the intermediate segment has the most active contractility. An unusually rich innervation in the anastomosis, therefore, indicates the significance of the neurogenic mechanisms in the vasomotor control of the anastomosis.

Animals↗