EKG

Question 1

How can you determine LAD on an EKG?

Answer 1

1) II and avF are negative

2) I and aVL are positive

Question 2

What is a characteristic to distinguish LAFB on EKG?

Answer 2

• -prolonged R-wave peak time in aVL (>45 msec) (1.5 tiny boxes)
• -qRs in I and aVL
• -rSs in II, III, aVF

Question 3

What are the characteristics of distinguishing LBBB on EKG?

Answer 3

• -QRS 120ms

- -WiLLiaM (w in v1, M in v6)

Question 4

What is voltage criteria for LVH?

Answer 4

• -S in V1 + R in V6 >35
• -R in aVL > 11
• -TWI in V5-V6, I, aVL (from left ventricular strain; NOT seen in LAFB although LAFB can meet voltage criteria)

Question 5

What are the causes of LAD?

Answer 5

1) LAFB
2) LBBB
3) LVH
4) Inferior MI
5) ventricular ectopy
6) paced rhythm
7) WPW