,acute myocardial infarction (what is happening/stages of ECG(6))
abrupt occlusion of the vessel
normal
hyperacute T waves (tall+peaked)
ST segment elevation
improvement in ST segments with reperfusion
T wave inversion (myocardial damage left behind)
pathological Q waves (damage across whole myocardium, from
endocardium to epicardial surface-transmural)
ECG
electrocardiogram is a simple test that can be used to check the hearts
rhythm and electrical activity
Previous
sensors are attached to the skin and are used to detect the electrical
signals produced by the heart each time it beats
from which limb to limb do each of the limb leads move (negative to
positive)
what view of heart does this give
1 - right arm to left arm - Left view of heart
2 - right arm to left leg - Inferior left view of heart
3 - left arm to left leg - inferior right view of the heart
What plane do the limb leads view the heart in?
what do they show
attached to
what do the 3 have in common
vertical plane
the potential difference in the electrical activation of 2 limbs at a time
, R arm, L arm, L leg
bi-polar
what do the augmented leads measure?
what plane
polarity and therefore how do they take reading
The electrical activity between the heart & one extremity
more frontal
unipolar - 1 limb electrode as positive pole and take average of other 2
inputs as 0 reference
augmented leads setup
views they give
aVL - positive is left arm so looking at upper left side
aVR - positive is right arm so looking at upper right side
aVF - positive is left leg so looking at inferior wall
what is right leg electrode for
remove artefacts
earth electrode
V1-V6 chest electrodes follow what general directions
what plane
Right to the heart apex
anteroposterior direction
horizontal
cardiac axis
normal conduction
general direction in which the heart depolarises
-30degrees to 90degrees
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