Cardiac Lecture 1 Flashcards
Normal MAP for this class
100mmHg (93 more accurate)
Normal MAP calculation
MAP= Diastolic + 1/3 x (Sys - Dia)
Normal RA pressure
0 mmHg
Normal PA pressure (mPAP)
16 mmHg
Normal PA systolic pressure
25mmHg
Normal PA diastolic pressure
8mmHg
Normal LA pressure
2 mmHg
Compliance
ability to stretch
change in volume over change in pressure
Δ V / Δ P
If a high pressure is needed to pump a volume into a space, the compliance of that space would be ______
low
If a low pressure is needed to pump a volume into a space, the compliance of that space would be ______
high
Normal CO for this class
5 L/min
Normal HR for this class
72bpm
Normal stroke volume for this class
70mL
gravity’s effect on BP
13.6mm = +1 mmHg
Reference point for BP with 0 effects of gravity
Isogravimetric point
Where is the isogravimetric point located
In the tricuspid valve
Venous system is a ______ compliance system
high
Arterial system is a _______ compliance system
low
Adding volume, but having little effect on pressure means the system is _____ compliance
high
Adding volume and having large effect on pressure means the system is _____ compliance
low
A ________ system readily accepts volume
high compliance
Free water clearance (CH2O)
volume of water removed from body/time
Relationship between free water clearance and ADH
Inverse
- More ADH → low free water clearance
- Low ADH → high free water clearance
Pulmonary circuit ΔP
PAP - LAP → 14 mmHg
Pulse pressure (ΔP) in the aorta
120 - 80 = 40 mmHg
Pulse pressure calculation
Pulse pressure = systolic - diastolic
Pulse pressure in arteries vs veins
High in arteries and low in veins due to compliance
Why does the pulmonary circuit have low pulse pressure?
low vascular resistance
Relationship between pulse pressure and stroke volume
Direct - high SV increases pulse pressure and low SV decreases pulse pressure
What are the venous vascular pressures at the umbilicus, knee, and base of foot?
20 mmHg @ umbilicus, 40 mmHg @ knee, 90 mmHg @ base of foot
What are the venous vascular pressures in the cranial sinuses?
-10 mmHg
Define distensibility
Aka expandability, similar to compliance but includes original volume of the container; determines how much volume the container can accept
- small original volume = higher distensibility
normal SVR
800 - 1600
How much blood is in the venous vs arterial circulation?
700 mL of blood in arterial circulation
2500 mL of blood in venous system
On a pressure vs volume graph, the slope of the line is an estimate of ______
compliance
