BP and Cardiovascular Lab Flashcards
BHP
blood hydrostatic pressure
- force that pushes on walls of blood vessels and moves blood forward
effect of volume and resistance on BHP
- increased volume = increased BHP
- increased resistance = increased pressure
effect of radius on resistance
smaller radius = larger resistance
preload and afterload
- preload = EDV
- afterloa = TPR
frank starling law of the heart
- EDV directly proportional to contractility
- increased volume –> heart muscles stretch more –> greater recoil
cardiac output formula
CO = heart rate * stroke volume
TPR, where generated, effect on stroke volume and pressure
- generated by small arteries and arterioles
- decreases stroke volume because more for heart ot pump against
- greater TPR = decreased stroke volume
- greater TPR = increased pressure upstream and decreased pressure down stream
laminar flow
- silent, blood flow parallel, faster in the center
turbulent flow and cause
- noisy due to some obstruction
workflow of taking blood pressure - Korotkoff sounds
- inflate cuff to pressure higher then suspected systolic bp so vessel collapses –> let cuff deflate until first sound = systolic pressure because obstructed blood flow allowed –> continue to decrease pressure and korotkoff sounds will change –> diastolic bp when sounds disappear because vessels are unobstructed
pulse pressure
- systolic - diastolic bp, this is what we feel when pulse is felt
systolic and diastolic pressure meaning and normal ranges
systolic = 80-120 diastolic = 60-80
mean arterial pressure formula and why
diastolic + 1/3 pulse pressure because more time is spent in diastole
maximum cardiac rate formula
220 - age and only 80% of that otherwise CO drops since not enough type in diastole for ventricles to fill
aerobic capacity
maximum rate of oxygen consumption
