Orientation: EKG Basics

Question 1

Review this lecturer’s system for analyzing EKGs.

Answer 1

1) Rate
2) Rhythm
3) Axes
4) Intervals (PR, QRS, QT)
5) Segments (ST-elevations, T peaks)

Question 2

_______ is the rhythm strip.

Answer 2

Lead II

Question 3

Which rhythm has the “bunny ears” sign?

Answer 3

Right bundle-branch block

Question 4

Each large (sharply red box) is _________.

Answer 4

0.2 seconds

Question 5

The small boxes (faintly written) are _________.

Answer 5

0.04 seconds (40 mSec)

Question 6

Go through the large-box method for calculating heart rate.

Answer 6

• 1 box: 300 bpm
• 2 boxes: 150 bpm
• 3 boxes: 100 bpm
• 4 boxes: 75 bpm
• 5 boxes: 60 bpm

Question 7

Look at these leads for QRS axis: ____________.

Answer 7

I, II, aVF

Question 8

Being positive in lead I means ______________.

Answer 8

that the axis is somewhere in the left part of the body

Question 9

Being positive in lead aVF means _____________.

Answer 9

that the axis is somewhere in the inferior part of the body

Question 10

What can cause right axis deviation?

Answer 10

• COPD
• Pulmonary embolism
• RVH

Question 11

Normal PR interval is ____________.

Answer 11

120 - 200 mSec (3-5 small boxes)

Question 12

PR interval is calculated by ____________.

Answer 12

the beginning of the P to the beginning of the R

Question 13

QT is calculated by _____________.

Answer 13

the beginning of the Q to the end of the T

Question 14

As a rough rule of thumb, the QT should not be longer than _____________.

Answer 14

half the RR interval

Question 15

An extra P wave is called ___________.

Answer 15

premature atrial complex

Question 16

Mobitz ____ is also called Wenckebach.

Answer 16

I

Remember the One-ckebach.

Question 17

No P waves with a regular rhythm is likely what rhythm?

Answer 17

Junctional rhythm

This is a rhythm generated by the bundles.