Acute Myocardial Infarction Flashcards
What are overlapping areas of perfusion called
Collateral circulation
Ischemia causes
ST depression
Infarction causes
ST elevation
What are two main ECG infarct classifications?
Q wave and non-Q wave
A Q wave infarct has a ____ chance of acute mortality than a non-Q wave infarct
Higher
Every infarct =
high chance (about 40%) of arrhythmia leading to sudden
cardiac death
A Q wave infarct has a ____ chance of long-term mortality than a non-Q wave infarct
Lower
What are reciprocal changes?
The “mirror image” that occurs when two electrodes view the same AMI
from opposite angles
Posterior reciprocal changes are found in
V1 and V2
II, III, and aVF have reciprocal changes in
I and aVL
Anterior wall AMIs rarely ___
present by themselves. Often occur with the septum
When both anterior wall and septum are affected (anteroseptal AMI),
infarct changes appear in leads
V1 to V4
When infarct occurs in anterior and lateral walls (anterolateral AMI),
changes show in
V3to V6, possibly
I and aVL.
When anterior wall, septum, AND lateral wall are involved
(anteroseptal AMI with lateral extension), what leads are affected
V2to V5
and usually V1, V6, I, and aVL.
hemodynamic compromise
and cardiogenic shock
are associated with what form of MI
Anteroseptal MI
True or false: High lateral AMIs do not show reciprocal changes in inferior leads.
false
Where do changes occur in an apical AMI
leads I, II,
III, aVF, aVL, and V to V.
What leads may be used for a posterior MI
V7-V10
What leads may be used in a right sided MI
V4r, V5r, V6r
Right ventricular AMI causes
just enough pressure to push blood into ventricles
and assist with blood return slightly
What are the criteria for a RVI
- IWMI
- ST segment elevation greater in lead III than II
- ST elevation in V1(possibly extending to V5to V6)
- ST depression in V2(unless elevation extends, as in #3)
- ST depression in V2can’t be more than 1/2 ST elevation in aVF
- More than 1 mm of ST elevation in right-sided leads (V4R to V6R)
If you see ST segment elevation in II, III,
and aVF as well as V1,the most
probable explanation is
RVI
For an IRVI ST Depression in V2Cannot Be More Than
Half the ST Elevation in aVF
The most specific sign of RVI is
More Than 1 mm ST Elevation in Right
Sided Leads (V4R to V6R)
