Perfusion Flashcards
What is perfusion ?
process of transporting nutrients to the cells and surrounding tissues
What is the difference between central and tissue perfusion ?
- Central: perfusion to the heart muscle itself
- Tissue: peripheral perfusion
What is cardiac output ?
amount of blood pumped by each ventricle in 1 minute
What is blood pressure ?
force exerted by the blood against the walls of the blood vessels
What is blood pressure a measure of ?
cardiac output and systemic vascular resistance
What is systole ?
contraction of myocardium
- < 120 is good
What is diastole ?
relaxation of myocardium
- <80 is good
What is mean arterial pressure (MAP) ?
the average pressure within the arterial system that is felt by organs in the body
- goal MAP: >60 mmHG
What are the 3 functional ways to view cardiac activity ?
- electrical
- muscular
- vascular
What is the SA node ?
pacemaker of the heart
- electrical system starts here
- 60-100 bpm
What is the AV node ?
delays electrical signal
- 40-60 bpm
- further down the SA node the slower the HR
What is the Purkinje Fibers ?
deliver shock to both ventricles
- 20-40 bpm
What is the Frank-Sterling Law ?
the greater the contraction, the more force the blood is excreted out of the aorta
Where does the Left Coronary and Circumflex Artery supply blood to ?
to left atrium, left ventricle, interventricuar septum
Where does the Right Coronary Artery supply blood to ?
to right atrium, right ventricle, and posterior side of left ventricle
When does coronary circulation occur ?
during diastole
What is Systemic Vascular Resistance (SVR) ?
total peripheral resistance that your heart must overcome to provide adequate perfusion
What are the 3 factors that influence Systemic Vascular Resistance (SVR) ?
- vascular resistance
- blood viscosity
- turbulence
How does length affect vascular resistance ?
the longer the tube the more resistance
- usually static in pt’s
How does diameter affect vascular resistance ?
- the wider the diameter the less resistance
- the smaller the diameter the more resistance