Chronic localized hypotension and resetting of carotid sinus baroreceptors. Electrophysiological and histological studies in the dog.

Resetting of carotid sinus (CS) baroreceptors to chronically elevated systemic pressure in hypertension has been demonstrated. The effects of chronic system hypotension on CS baroreceptor afferents has not been elucidated, however. The purpose of the present study was to determine the electrophysiological and histological characteristics of CS baroreceptors exposed to chronic hypotension.

Abdominal aortic aneurysm and retroperitoneal fibrosis. Ultrasonographic diagnosis and treatment.

Until changes of ureteric or vascular compromise are noted, retroperitoneal fibrosis usually goes unnoticed. When symptomatic retroperitoneal fibrosis has been associated with abdominal aortic aneurysm, ureteral involvement has uniformly been present. Three cases demonstrate a new ultrasonographic picture that can aid in early identification of retroperitoneal fibrosis before complications are manifest.

Pathologic findings in the aortocoronary vein grafts. A scanning electron microscope study.

Examination of totally or partially obstructed human aortocoronary vein grafts, obtained at different time intervals after the bypass operation, has shown that the initial occlusive process is due to thrombosis and may appear a few hours or days after surgery. The cellular phase of intimal proliferation affecting most of the grafts becomes apparent about 4 weeks after the operation. After 1 year the intimal hyperplasia acquires a cell-poor, fibrotic character; the graft usually remains patent.