Venous Tone
نویسندگان
چکیده
منابع مشابه
Perceptual relationships to peripheral venous tone.
IN AN experiment performed a few years ago [l], which involved periodic drawings of venous blood from an indwelling cournand needle, it was observed that it was more difficult to withdraw venous blood (from a superficial arm vein) in Field Dependent (FD) than Field Independent (FI) Ss. A variety of other investigations have suggested that these two groups differ in the degree to which they are ...
متن کاملVenous smooth muscle tone and responsiveness in older adults.
Venous compliance is lower in older adults compared with younger adults. It is possible that alterations in venous smooth muscle tone and responsiveness may contribute to the age-related differences in venous compliance. To determine the effects of sympathetic activation [cold pressor test (cold pressor test); rhythmic ischemic handgrip (rhythmic ischemic handgrip)] and endothelium-independent ...
متن کاملLack of variation in venous tone potentiates vasovagal syncope.
OBJECTIVE To investigate the peripheral venous response to head up tilting in malignant vasovagal syndrome. PATIENTS 31 Patients with unexplained syncope or dizziness referred from the cardiology department. METHODS Changes in calf venous volume were studied by a radionuclide technique during 45 degrees head up tilt testing. RESULTS During tilt testing six patients became syncopal but 25 ...
متن کاملReflex alterations in venomotor tone produced by venous congestion.
Changes in venous tone produced by partial occlusion of the thoracic inferior vena cava, or of the mitral orifice, have been studied in acute experiments on anesthetized dogs, employing distensibility diagrams obtained from injections into the veins of a loop of intestine to measure venous tone. The results demonstrate a reflex mechanism producing venous dilation in response to venous congestio...
متن کاملRepeated pregnancies (multiparity) increases venous tone and reduces compliance.
In humans, multiparity (repeated pregnancy) is associated with increased risk of cardiovascular disease. In rats, multiparity increases the pressor response to phenylephrine and to acute stress, due in part to changes in tone of the splanchnic arterial vasculature. Given that the venous system also changes during pregnancy, we studied the effects of multiparity on venous tone and compliance. Ca...
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ژورنال
عنوان ژورنال: BMJ
سال: 1961
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.2.5267.1589