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NUR 211 Perfusion Exam Questions And Verified Solutions
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NUR 211 Perfusion Exam Questions AndVerified Solutions
Perfusion - Answer circulation of blood within an organ or tissue in adequate amounts to
meet current needs of the cells, arterial blood flow through to the tissue, venous blood
return to the heart
What muscles assist in the return of venous blood to the heart? - Answer calf
when blood flow is interrupted to any portion of the body it results in __________. -
Answer ischemia
What portion of the body utilizes the most blood? - Answer the myocardium (80%)
electromechanical association - Answer required for adequate perfusion
electrical + muscle reaction of the myocardium to contract
Systemic Vascular Resistance (SVR) - Answer the pressure in the peripheral blood
vessels that the heart must overcome to pump blood into the system
required to have some SVR to perfuse, also called the diameter of the vessel
SVR is increased in - Answer HTN
SVR is decreased in - Answer shock
Cardiac Output (CO) - Answer measurement of the amount of blood ejected per minute
, from either ventricle of the heart
determined by the preload, after load, and contractility of the heart
cardiac output formula - Answer CO = HR x SV
Signs of decreased cardiac output - Answer - cold extremities
- weak pulses
- slow cap refill
- low BP
- mottled skin
- decline in cognition
- HR varies
- diaphoretic
- decrease in urine output
who is at risk for a silent MI? - Answer Diabetics r/t muscular neuropathy, women r/t
alternate symptoms, elderly r/t slowing heart
Starling's theory - Answer amount of pressure with blood leaving depends partially on the
stretching of the heart muscle
increased stretch = increased elactisity
Preload (Diastole) - Answer The precontraction pressure in the heart as the volume of
blood builds up
Afterload (Systole) - Answer the pressure that must be exceeded before ejection of blood
from the ventricles can occur
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