33 terms

Theory... Focus 7

Cardiac output
4-8 liters
stroke volume
amount of blood pumped when hert beats
70 ml is normal
significance of heart beat
number of times the ventricle contracts in one minute... nomral is 60-100
calculation for CO
SV x HR = CO
common nursing diagnosis
decreased cardiac output
(nausea, SOB, Increase HR, decrease BP, skin color change, decreased urinary output)
ineffective tissue perfusion
(something interfering with blood flow, ex. blood clot)
excessive fluid volume
(cooling extremities, fluid in lungs)
characteristics cardiac cells
each cell in the heart can start electrical impulse
abilty to respond to electricle stimulus
abilty to transmit electricity from one cell to the next
ability of cells to shorten causing them to contact in response to stimuli
Contraction" electrical stimuli sent to cardiac muscle, making it contract
recovery phase: muscle of the heart has already contracted and is returning to ready state.
conduction pathway
SA node (located in Upper rt. atrium)
AV node (located in bottom rt. atrium)
bundle of his
bundle branches: break off into the ventricle
pukinje fibers: go into the muscle walls of the ventricles and cause contraction.
ventricle muscle
lead placement
white: right arm, right upper chest
green: right lower abdomen
brown: center
black: left arm, left upper chest
red: left lower area
little box
15 large squares
3 sec
5 small squares
2 hash marks
6 seconds
isoelectric line
can have positive deflection (above baseline)
can have negative deflection (belowe baseline)
sometims it's imaginary
P wave
first posative deflection
depolarization of atria
round and smooth
1 - for every QRS
PR interval
begining of P wave to the QRS complex
time it takes for the electrical conduction to go through atria and av node
PR interval
normal 0.12 -.0.20
QRS interval
three waves
first a negative deflection, the posative, then negative again
ventricle depolarization
QRS interval
normal is less than 0.12 seconds
ST segment
end of S wave to the begining of T wave
May be flat (normal), elevated, or depressed
change indicates cardiac problems
T wave
follows ST segment
repolarization of the ventricle
can be above or below basline
QT interval
less than 0.44 is normal
QT interval
depolarization and repolarization
begining of QRS to end of the T wave
rythm regular/irregular
R-R interval
determines if its regular/ and irregular
8 steps for ECG interpretation
determine heart rate
determine heart rhythm
is there a P wave for each QRS
Determine PR interval
Determine the QRS interval
Is there a T wave after each QRS
determine QT interval
what is the client's response and VS
normal sinus rythm
heart rate between 60-100
always a P wave for each QRS
PR interval less than 0.12
Normal QT interval less than 0.44
rhythm regular
sinus bradycardia
heart rate is less than 60
everything else is the same
characteristics of asystole
no electrical activity in atria or ventricles
No P wave, No QRS, No T wave