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12 Cards in this Set

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  • Back
What is the relationship between mitral pressure and should not affect pressure in the left atrium..
Mitral stenosis, aortic regurgitation, and mitral regurgitation all cause large increases in left atrial pressure. Tricuspid stenosis and regurgitation increase only the right atrial pressure, and should not affect pressure in the left atrium.
A twofold increase in what factor would result in the greatest increase in the transport of O2 across the capillary wall.
The transport of O2 across a capillary wall is proportional to the capillary surface area, capillary wall permeability to O2 and O2 gradient across the capillary wall. A twofold increase in the O2 conc gradientwould result in the greatest increase in the transport of O2 across the capillary wall.
Which vessels have the largest total cross-sectional area of all vessels of the circulatory system?
The capillaries. The venules also have a large total cross sectional area, but not as great as the capillaries, which explains the large storage of blood in the venous system compared with that in the arterial system.
What is the app. total blood volume in the veins?
App. 64%.
Which drugs have proved helpful to patients with myocardial ischemia?
Beta receptor blockers inhibit the sympathetic effects on the heart. Angiotensin converting enzyme inhibitors prevent the production angiotensin 11, thus decreasing the afterload effect on the heart. Norepinephrine increases the cardiac afterload which increases the myocardial O2 consumption. Coronary angioplasty opens up the coronary vessels. Chelation therapy has not proved to be of any benefit in patients with myocardial ischemia.
What can be said about the velocity of blood flow?
The velocity of blood flow within each segment of the circulatory system is inversely proportional to the total cross sectional area of the segment. B/C the aorta has the smallest total cross sectional area of all circulatory segments, it has the highest velocity of blood flow.
Which segment of regional capillaries have the lowest capillary permeability to plasma molecules?
The brain has tight junctions between capillary endothelial cells that allow only extremely small molecules such as water, oxygen and CO2 to pass in or out of the brain tissues.
What is the relationship between vascular compliance and vascular distensibility?
Vascular compliance is proportional to the vascular distensibility and vascular volume of any given segment of the circulation. The compliance of a systemic vein is 24 times that of its corresponding artery b/c it is about eight times as distensible, and it has a volume about three times as great.
What is the result on circulation regarding intestinal obstruction?
Intestinal obstruction often causes a severe reduction in plasma volume. Obstruction causes distension and partially blocks the venous blood flow in the intestines.This results in an increased intestinal capillary pressure which causes fluid to leak from the capillary into the intestinal walls as well as the lumen. The leaking fluid has a high protein content, similar to that of plasma, which reduces the total plasma protein as the plasma volume.
Why is interstitial hydrostatic pressure in a muscle capillary bed normally negative, about -3mmHg?
Pumping by the lymphatic system is the basic cause of the negative pressure.
What is the Cushing reaction?
It is a special type of CNS ischemic response that results from increases pressure of the cerebrospinal fluid around the brain in the cranial vault. This includes enhanced sympathetic activity, decreases parasym. activity, and increases heart rate, arterial pressure and total peripheral resistance.
What is the plasma differential in patients with severe burns.
There is a large loss of plasma like substances from burned tissues. The plasma protein cocnc is severely decreases, and the therapy of choice is plasma infusion.