EKG III Flashcards
In reciprocal ST depression, which leads show an ST elevation?
II, III, aVF
In reciprocal ST depression, which leads show an ST depression?
I and aVL
Give me the leads for the localization of an aneterior MI
V2, V3, V4 (at least 2)
Give me the leads for the localization of an Anteroseptal MI
V1, V2, V3 (+- V4)
Give me the leads for the localization of an Anterolateral MI
V4, V5, V6 (+- V3 or V2)
Give me the leads for the localization of an Extensive anterior MI
V1-V6 (all)
Give me the leads for the localization of an Lateral MI
V5, V6 (+- I or aVL)
Give me the leads for the localization of a high lateral MI
I, aVL
Give me the leads for the localization of an Inferior MI
II, III, aVF
Give me the leads for the localization of an inferolateral MI
II, III, aVF, V6 (+- V5)
Give me the leads for the localization of a Posterior MI
V1, V2
Give me the leads for the localization of an Inferoposterolateral MI
II, III, AvF, V6, V1, V2
Give me the leads for the localization of a Right ventricular MI
V4R, +V3R and/or V5R
What is the shape of the ST segment in early repolarization that makes it differnet than Acute pericarditis or an MI?
It’s concave UPWARDS
What happens with the PR interval with acute pericarditis?
It’s depressed.
That’s why you treat acute pericarditis with SSRI’s.
What are the specific Sx of acute pericarditis which makes it distinguishable from early repolarization and acute MI?
sharp pain, improves with change in body position, flu-like Sx
What can be goofy about the ST segment in inferior or high lateral wall MI’s?
Reciprocal ST depression
Does a NSTEMI or STEMI give a Q wave MI after time?
STEMI
Gonna be a long explanation, but tell me the reason why there are significant Q waves on EKG’s with some MI’s.
infarction on wall –> wall becomes dead and inert –> EKG reads through inert wall to other side –> other side depolarizing normally from endocardium to epicardium –> depolarization AWAY from + electrode –> large depression on Q wave.
What are the 2 criteria for determining significant Q waves on EKG?
- > 1mm wide
2. > 1/3 the amplitude of the QRS complex
Give me the time when the following EKG characteristics occur for an MI:
Normal R wave, peaked ST segment, T wave
Acute MI (onset and first several hours)
What wave diminishes after the first day in an MI?
R wave
When does the T wave become inverted after the initial MI?
1st and 2nd days
During the first and second days after an MI, is the ST segment still just as high as the original form, or has it decreased?
It decreased.
You bastard.
Give me the time when the following EKG characteristics occur for an MI:
No R wave, deep Q wave, ST segment back to baseline, T wave inversion peresists.
after 2-3 days
After several weeks-months, which waves persist?
Q waves and T wave inversion (but lessens a little)
