EKG basics

Question 1

quick cheat to confirm normal axis

Answer 1

up in 1 and avF

Question 2

nl HR

Answer 2

60-100

Question 3

1 small box time

Answer 3

0.04 sec or 40 msec

Question 4

how many small boxes in a big box?

Answer 4

5

Question 5

if reg rhythm, equation to calculate rate

Answer 5

300/# of large squares between consecutive R waves

Question 6

normal axis

Answer 6

-30 to +90

Question 7

PR interval

Answer 7

0.12-0.20 seconds (3-5 small squares)

Question 8

A prolonged or changing (esp lengthening) PR interval indicates _________

Answer 8

heart block

Question 9

QRS interval

Answer 9

normally less than 0.12 seconds (3 small squares)

Question 10

widened QRS width indicates some sort of conduction defect with ____________________

Answer 10

the left or right bundle branches

Question 11

what are we looking at with ST segments?

Answer 11

Look for sloping (especially downsloping) or flattening

Question 12

The PR interval reflects ___

Answer 12

conduction through the AV node.

Question 13

If PR interval is > 200 ms, what is present

Answer 13

first degree heart block

Question 14

Consistently prolonged PR interval

Answer 14

first degree heart block

Question 15

Progressilvely prolonged PR interval followed by dropped QRS

Answer 15

second degree heart block type I

Question 16

We see shortened PR interval (<120 msec) in ______

Answer 16

Preexcitation syndromes
AV nodal (junctional) rhythm

Question 17

The presence of broad, notched (bifid) P waves in lead II is a sign of ______

Answer 17

left atrial enlargement, classically due to mitral stenosis.

Question 18

The presence of tall, peaked P waves in lead II is a sign of ______

Answer 18

right atrial enlargement, usually due to pulmonary hypertension (e.g. cor pulmonale from chronic respiratory disease)

Question 19

Anterior leads

Answer 19

V1, V2, V3, V4

Question 20

Blood supply to anterior leads

Answer 20

LCA, LAD

Question 21

Lateral leads

Answer 21

1, aVL, V5, V6

Question 22

Blood supply to lateral leads

Answer 22

Circumflex

Question 23

Septal leads

Answer 23

V1, V2

Question 24

Blood supply to septal leads

Answer 24

LAD

Question 25

Inferior leads

Answer 25

II, III, aVF

Question 26

Blood supply to inferior leads

Answer 26

RCA