NIBP Flashcards
MAP formula
SBP + (DBP x2) / 3
What components is the systolic BP determined by ? (2)
The volume of ventricular ejection IN REALTION TO the distensibility of the arterial system
What is the diastolic pressure chiefly determined by ? (2)
Vascular resistance AND the duration of diastole
What is the pulse pressure?
The difference between the SBP and DBP
What does the PP reflect?
Stroke Volume. A narrowed PP indicates a decreases in SV.
How does the MAP change in relation to the sampling site?
It does not change. p. 110 Darovic
How is the MAP formula derived?
It assumes a heart rate of 60 bpm because it assumes diastole occupies 2/3 of the cardiac cycle and systole occupying g the other 1/3
How does an increasing HR affect the MAP calculation?
As heart rate increases diastole time can decrease. As HRs reach 100 bpm diastole may be less than 1/2 the cardiac cycle. This would distort the formula which assumes a 1:2 ratio of systole to diastole.
What is Hydrostatic pressure?
The pressure exerted by a volume of fluid in a given space.
What is osmotic pressure?
The attraction of fluid to protein molecules across a semi-permeable membrane? Fluid moves from lower to higher concentrations. Albumin contributes to 75% of this pressure and keeps fluid intravascular. p. 112 Darovic
