EKG Questions

Question 1

What is the upper “borderline” value for QT-prolongation for male and females?

Answer 1

> 450ms (male)

> 470ms (female)

Question 2

How long in seconds is 1 large ecg box?

Answer 2

1 large box = 0.20 seconds

Question 3

How long in seconds is 1 small ecg box?

Answer 3

1 small box = 0.04 seconds

Question 4

What are the 3 main coronary arteries?

Answer 4

Right coronary artery (RCA), Left anterior descending (LAD), Left circumflex artery (LCX)

Question 5

What does reciprocal changes mean?

Answer 5

When there is ST-elevation one anatomical side of the heart, then there can be “reciprocal” ST-depression on the opposite anatomical side of the heart.

Reciprocal Leads:

Inferior: II, III, aVF
&
High Lateral: I, aVL

Anterior: V1, V2, V3, V4 &
Posterior: None

Question 6

What MI would you suspect with an EKG that shows ST-depression in leads V1, V2, V3, V4?

Answer 6

Posterior MI

Question 7

What is the lower limit value that would be concerning for QT-shortening for males and females?

Answer 7

<360ms (males)

<370ms (females)