To know where given amounts of blood might be, we need to know the potential vascular space and what the distribution among various sized vessels is. Methyl inethaerylate was injected via the cannulated aorta into 4 rats, and vascular casts made. Polymerization caused 15 per cent shrinkage. The casts were separated into 3 compartments: 150 /x. and smaller, 150 to 600 u.., and 600 n. and larger....

A microcatheter foreign body retrieval device is described and its first two clinical applications are presented. The device functions identically to larger loop snare retrievers. It permits access to small vessels and was successful in its first clinical applications.

The levels of noradrenaline, neuropeptide Y, 5-hydroxytryptamine, and substance P were measured and compared between the large arteries of the circle of Willis and the small cerebral vessels of the pia mater in the rat, rabbit, cat, and monkey. In all species, noradrenaline and neuropeptide Y concentrations were greater in the larger arteries than in small pial vessels. Noradrenaline concentrat...

OBJECTIVES Stent implantation reduces restenosis in vessels > or =3 mm compared with balloon angioplasty, but few data are available for stents implanted in vessels <3 mm. The aim of this study was to evaluate immediate and follow-up patient outcomes after stent implantation in vessels <3 mm compared to stent implantation in vessels > or =3 mm. METHODS Between March 1993 and May 1996, a total...

the acute coronary syndrome due to the left main coronary artery (lmca) thrombosis is a clinically rare and catastrophic event.   we describe a young man ( smoker, alcoholic, and drug abuser) with a history of recent surgery and typical chest pain who had non-occlusive lmca thrombosis in coronary angiography. the thrombosis was successfully treated with two 180 µ/kg intracoronary boluses of ept...

Most blood vessels contain elastin that provides the vessels with the resilience and flexibility necessary to control hemodynamics. Pathophysiological hemodynamic changes affect the remodeling of elastic components, but little is known about their structural properties. The present study was designed to elucidate, in detail, the three-dimensional (3D) architecture of delicate elastic fibers in ...

The purpose of this study was to determine the effect of inhibition of nitric oxide (NO) release on the diaphragmatic microvascular responses to hypoxia. In alpha-chloralose-anesthetized mongrel dogs, the microcirculation of the vascularly isolated ex vivo left hemidiaphragm was studied by intravital microscopy. The diaphragm was pump perfused with blood diverted from the femoral artery through...

Spatial details of entoptically visible retinal vessels were investigated using transcleral and Maxwellian-view stimulators. Nine normal subjects provided detailed drawings of the entoptic images which were digitized and superimposed onto digitized fundus photographs and fluorescein angiograms from the same eyes. Subjects also used a tracing method to locate visible entoptic features. The trans...