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19 Cards in this Set

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  • Back
Where is there venous resistance to blood flow in the thorax
the subclacian vein compressing as it passes over the first rib; and increased intra abdominal pressure intermittently compresses abdominal veins
Why is venous pressure measured in a supine patient
no gravitational effect on peripheral venous pressure
hyperventilation does what to venous return
enhances
when does varicose veins occur
when there is prolonged increased intravenous pressure in the lower extremities
what is the treatment for varicose veins
leg elevation to heart level, use of compression stocking, weight loss, childbirth
what happens in superficial leg veins especially below the knees with varicose veins
the veins walls stretch and valves lose their ability to prevent blood backflow, they become enlarged and bulbous
what happens to capillary hydrostatic pressure with varicose veins
it increases which causes filtration which causes edema and inadequate gas and nutrient diffusion to muscle and skin
what does interstitial edema and inadequate gas and nutrient diffusion to skin and muscle cause
muscle weakness and pain, skin ulceration in severe cases
What does not function if you are standing at rigid attention for long periods
the venous pump does not function
When standing at rigid attention what happens to the capillary hydrostatic pressure
it increases rapidly
In ridged attention, after the capillary hydrostatic pressure has increased, what can happen next
up to 10-20% of blood volume is loss to plasma diffusing into tissue interstitial spaces and interstitial edema occurs, reducing diffusion and fainting may occur if the pump is to activated
a mechanism that overcomes gravitational pressure in the lower extremities of a standing or sitting person
the venous pump
walking decreases venous pressure in the feet to what
< 20 mmHg
What is the venous pressure in the feet
90mm
what is the venous pressure in the thigh
40mm
venous pressure while standing absolutely still is what in the feet
90mmHg
what is the venous pressure in the hands with arms at both side is what
35mmHg
What does gravitational pressure (hydrostatic pressure) do to the weight of blood in the veins between the extremities and the heart in a standing or sitting person
increase the weight
blood flow through compressed veins does what as CVP increases above normal
increases the compressed veins are the subclacian and the abdominal