Lilly Cardiology EKG Chapter

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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

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Aorta The largest artery in the body aortic valve the valve between the left ventricle and the aortaa WE …

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We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy How many layers of tissue does an artery have? Three The conduction system contains pacemaker cells, nodes, the __, …

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We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy The Heart – uses arteries to deliver blood to cells and tissues and veins to receive it back – …

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Rough ridges of muscle on the inner wall of the atria Pectinata These vessels carry reoxygenated blood back from …

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