NUR1 324 Lecture : Physiology - Cardiovascular Notes.docx
Document Summary
Flow = volume (ml or l) /time (min) Cardiac output = 5 l/min: flow generated by left or right heart. Flow through a vessel = area (cm3) x mean velocity (sec: velocity not the same at all points in cross section. Pressure (pa) = force/area (mmhg) = pgh = height (cm h2o: blood pressure: 120/80 mmhg, central venous pressure: 6cm h2o, pgh density (can"t change) x gravity (can"t change) x height (can change) Measuring cvp (central venous pressure: veins which come into the right atrium have approximately the same pressure as in the right atrium. Cvp = pressure in ra: keep manometer at higher level than right atrium cause fluid to move out of manometer and into. Ra through catheter until hydrostatic pressure = ra pressure (cvp: when the liquid in the manometer is at the same level as the ra, the pin = pout and the flow = 0.
