Lilly Cardiology EKG Chapter

Normal PR interval
.12 -.2 seconds

Normal QRS interval
< .1 seconds

Normal QT interval
Half or RR interval. Or QTc<.44 sec

Corrected QT interval formula
QT/sqroot(R-R)

Criteria for Right Ventricular Hypertrophy
R>S in V1
Right axis deviation

Criteria for Left Ventricular Hypertrophy
S in V1 +R in V5 or V6> 35mm

Criteria for RBBB
Criteria for RBBB
– Wide QRS
– RSR’ in V1 (rabbit ears
– Prominent S in V6

Criteria for LBBB
Criteria for LBBB
– Widened QRS
– Broad notched R in V6
– Absent R and prominent S in V1

Criteria for Left Anterior Fascicular Block
Criteria for Left Anterior Fascicular Block
– LAD
– Small Q in lateral leads (I and aVL)
– Small R in inferior leads (II, III and aVF)

S in aVF, R in aVL

Criteria for Left Posterior Fascicular Block
– RAD
– Small R in lateral leads (I and aVL)
– Small Q in inferior Leads (II, III, aVF)

R in aVF, S in aVL

Inferior MI Leads
II, III, aVF

Inferior MI

Coronary Arteries Affected:

RCA

Anteroseptal MI Leads
V1-V2

Anteroseptal MI Coronary Arteries Affected:
LAD

Anteroapical MI Coronary Arteries affected
Distal LAD

AnteroApical MI Leads
V3-V4

Anterolateral MI Leads
V5-V6, I, aVL

Anterolateral MI Coronary Artery affected
Left Circumflex

Extensive Anterior MI leads and Coronary Arteries affected
V1-V6, Proximal Left Coronary Artery

Posterior MI leads and Coronary Arteries affected
V1-V2 (R waves, not Q)

Right Circumflex artery

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