EKG

Question 0

QRS complex represents…

Answer 0

Phase of ventricular depolarization

Question 1

PR interval represents…

Answer 1

Time of atrial depolarization onset to ventricular depolarization onset

Question 2

QRS duration represents…

Answer 2

The duration of ventricular depolarization

Question 3

QT interval represents…

Answer 3

The duration of ventricular depolarization and repolarization

Question 4

What does the U wave represent and is it always visible?

Answer 4

Intraventricular septum repolarization, is not always visible. Always follows the T wave. If extremely prominent, suspect hyperkalemia, hypercalcemia or hypothyroid.

Question 5

T wave represents

Answer 5

Ventricular repolarization

Question 6

P wave represents

Answer 6

Atrial depolarization

Question 7

Common EKG changes with hypokalmia include…

Answer 7

ST depression, inverted T waves and prominent U waves

Question 8

A patient with hypokalemia may also develop…

Answer 8

Heart block

Question 9

Each large box on an EKG =

Answer 9

.20 sec

Question 10

Each small box =

Answer 10

.04 sec

Question 11

Describe the 300 method of HR determination

Answer 11

If rhythm is regular, HR is 300/#of large boxes between QRS complexes (RR interval).
e.g if 2.5 boxes HR = 300/2.5=120

Question 12

Describe the 6 second method to determine heart rate on an EKG

Answer 12

It is used if the rhythm is irregular. Count the number of R waves in a 6 second strip and multiply by 10.

e.g. 8 R waves x 10 = HR 80

Question 13

What are the 6 components that enable the interpretation of EKGs?

Answer 13

Rate (tachy, brady)
Regularity (regular, irregular)
P wave
PR Interval (duration)
QRS complex (shape, size, duration)
QT interval (duration)