Test 1 Flashcards
Stroke volume
volume of blood in ventricles just before contraction
Stroke Volume average
70 ml/beat in adults
Ejection Fraction
fraction or percent of blood ejected with each contraction
Ejection Fraction Average
50-70%
Average Cardiac Output
4-8 L/min
Preload is
volume of blood in cardiac muscle
Afterload is
Pressure the blood overcomes to eject blood
Cardiac Index normal range
2.5-4.2 L/min/m2
Hear a Bruit feel a Thrill
bruit-swishy noise from turbulent blood
thrill- feeling over a shunt
Order of listening to valves
APTM aorta-upper right of sternum Pulmonic-upper left Tricuspid-lower right Mitral-lower left
aortic and mitral valves have the most
murmurs
S1 sound
lub
closure of AV valves
beginning of systole
heard loudest at apex
S2 sound
dub
closure of semi lunar valves
end of systole beginning of diastole
Echocardiogram
test for wall motion and valve movement that also gives us ejection fraction
Transesophageal Echo
more invasive echo used with afib for blood clots
Troponin cardiac enzyme
measures protein released after MI, most specific and most widely used, usually under 0.3, rises in 3-6 hours and stays elevated up to 2 weeks
Healthy lipid
HDL
Lethal lipid
LDL
Most common electrolyte imbalance for heart pts
K- performs major function in cardiac depolarization and repolarization
Na in heart
vital part in depolarization of myocardium
Ca in heart
important function in depolarization and myocardial contraction
Absolute Refractory Period
cardiac cell unable to respond to new electrical stimulus
Relative Refractory Period
repolarization is almost complete, cardiac cell can be stimulated to contract prematurely if stimulus is stronger then normal
How long does artia need to rest
0.15 sec
how long does ventricles need to rest
0.25 to 0.30 sec
hearts period of rest is also called
repolarization
P wave is
atrial depolarization
PR interval should be
0.12-0.20 sec
QRS is
ventricular depolarization
T wave is
ventricular repolarization
U wave is a sign of
hypokalemia and dig tox
St segment elevation and depression
elevation- infarction
depression- ischemia