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For this reason, measured viscosities of the noble gases serve as important tests of the kinetic-molecular theory of transport processes in gases (see Chapman–Enskog theory). One of the key predictions of the theory is the following relationship between viscosity μ {\displaystyle \mu } , thermal conductivity k {\displaystyle k} , and ...
Ambulatory blood pressure monitoring allows blood pressure to be intermittently monitored during sleep and is useful to determine whether the patient is a "dipper" or "non-dipper"—that is to say, whether or not blood pressure falls at night compared to daytime values. A nighttime fall is normal and desirable.
Aortic pressure, also called central aortic blood pressure, or central blood pressure, is the blood pressure at the root of the aorta. Elevated aortic pressure has been found to be a more accurate predictor of both cardiovascular events and mortality, as well as structural changes in the heart, than has peripheral blood pressure (such as ...
10 to 13 hours per night for children under age 6. ... Normally, blood pressure drops by around 10% during sleep, but that was less likely when kids slept longer than the recommended amount.
The drop in blood pressure may be sudden (vasovagal orthostatic hypotension), within 3 minutes (classic orthostatic hypotension) or gradual (delayed orthostatic hypotension). [4] It is defined as a fall in systolic blood pressure of at least 20 mmHg or diastolic blood pressure of at least
This drop in pressure, combined with activity of the sympathetic autonomic nerves supplying vascular smooth muscle, leads to profound vasoconstriction to the extent that the intra-vessel pressure may not overcome the critical closing pressure and subsequently collapse. This abrupts blood supply to tissues, otherwise termed shock.
Pressure drops gradually as blood flows from the major arteries, through the arterioles, the capillaries until blood is pushed up back into the heart via the venules, the veins through the vena cava with the help of the muscles. At any given pressure drop, the flow rate is determined by the resistance to the blood flow.
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