Hemodynamics Flashcards
MAP
mean arterial pressure
MAP calculation
SBP + (DBP*2) / 3
CO
cardiac output
CO calculation
SV * HR
preload
return of blood to the heart; blood volume
how is preload measured?
by taking CVP from CVC
how is CO measured?
using a PA pressure monitor/swan
afterload
vascular resistance, blood pressure
purpose of a transducer?
converts physiologic signals into electrical, to be displayed on monitor
where should the transducer be leveled to?
phlebostatic axis - 4th intercostal space, mid-axillary
what happens if the transducer is too low?
false high readings
what happens if the transducer is too high?
false low readings
risks of invasive hemodynamic monitoring
infection, air emboli, bleeding, inaccuracies
hemodynamic monitoring set up - what to assess
adequate fluid, pressure @ 300, secure connections, alarm parameters set
site assessment of invasive hemodynamic monitoring
occlusive & intact dressing, warmth, redness, drainage, bleeding, sutures; neurovascular checks
neurovascular check
color, temp, movement, sensation, pain, pulses
Allen’s test
checks if ulnar artery is strong enough to compensate for arterial line placement in radial artery
normal central venous pressure
2-8
causes of low CVP
hypovolemia
what does CVP measure?
pressure in R atrium - preload
causes of high CVP
hypervolemia, R ventricular failure, PE, pulmonary valve stenosis, high PEEP from mechanical ventilation
PA pressure
pulmonary artery pressure
what value does a PA pressure monitor or swan give you?
cardiac output
