- See:
EKG interpretation
Presence of
Q wave
Reciprocal ST
Location:
or ST seg changes
Depression
Sequelae
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Anterior:
V1-V4 (& poor R wave
II, III, AVF
Ant Hemiblock +/-R.BBB
progression in V1-V6
Lateral:
I, AVL, V5, V6
V1 - V3
R.A.D.
Inferior:
II, III, AVF (V6)
I, AVL,V1-3 (V4);
Post HemiBlock
Rt. BBB
AV block
Posterior: Abnormally tall R
V1 to V3;
and T in V1 to V3;
Subendo:
No abnormal
Q wave
None:
ST seg depression
in Ant leads (I, AVL,
V1-V6) or inferior
leads (II, III, AVL);
Septal:
V1 involvement;
Anterolat: V3-6, aVL, I;
- Discussion of
EKG Changes with MI:
-
ST depression: subendocardial ischemia;
- ST Elevation : Transmural Ischemia, Acute Injury Phase (along with tall positive hyperacute T waves);
- T Inversion
: Over days to weeks after MI, deep
T wave inversion replaces ST seg elevation;
-
Q wave: Occur 24-48 hrs after a transmural MI; A
Q wave is the initial negative deflection of QRS complex;
A "significant"
Q wave is 0.04 sec in duration and >25% Ht of R wave;
- note: Q waves cannot be diagnosed w/
Left B.B.B. and old Q waves may mask new Q waves;
- note: leads I, II, V5, and V6 commonly contain insignificant Q waves; ignore
Q wave in AVR;
