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AHN 447 TEST #1- Questions & Answers
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AHN 447 TEST #1- Questions & Answers
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AHN 447 TEST #1- Questions & AnswersStarling's law Correct Ans-The SV or the heart increases in response to an increase in the
volume of blood in the ventricles, before contraction (end of diastolic volume), when all other
factors remain constant
The more volume a pt has, the higher the R atrial pressure will be
What influences preload? Correct Ans-Hypovolemia
Hypervolemia
Venous obstruction
What does pulmonary artery pressure measure? Correct Ans-Very specific indicator of overall
volume status (usually post open heart surgery, HF pt, on cardiac units, etc)
Pressure in lungs or pulmonary system
Looks at function of left side of heart
Cardiac output Correct Ans-Amount of blood ejected from left ventricle with each heartbeat
SV x HR=CO
Preload Correct Ans-Amount of blood returning to right atrium...how much blood is coming
back from the body
How do you measure preload Correct Ans-CVP
, After load Correct Ans-Indicator of the force or resistance the heart must overcome to empty
oxygenated blood into the aorta (how much resistance the heart must overcome)
How do you measure after load? Correct Ans-SVR
What controls the AV valves? (Mitral and tricuspid) Correct Ans-Chordae tendinae
Troponin I Correct Ans-Released with any myocardial damage
"Gold standard"
Results available within 15 min
Any elevation above 0.1 is abnormal
Myoglobin Correct Ans-Muscle protein
Earliest marker available
Not clinically useful
Normal lipid profile Correct Ans-Total: <200
HDL (good): men: >45; women: >55
LDL (bad): men: <160; women: <135
INR Correct Ans-Warfarin, Coumadin
Thick blood = low INR
PTT Correct Ans-Heparin
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