Quiz 6 - Waves, Segments & Intervals

Question 1

What are the 3 methods used to calculate HR and when they are best used?

Answer 1

Triplets Method (Regular Rhythms)
R - R Method (Regular Rhythm, greater accuracy)
6 sec method (Irregular, regular and brachycardia)

Question 2

What are the beats per min in triplets and how to do identify where to start? What does this give you

Answer 2

300, 150, 100, 75, 60, 50
start on R-wave on line
An estimate of the bpm

Question 3

What is a normal HR for healthy adults?

Answer 3

60 to 100 bpm

Question 4

How do you calculate HR using the R-R method?

Answer 4

Count the small boxes x 0.04sec = ____ ; then 60/ ___ (*the small box answer) = ___ BPM

3 small boxes or less (aka 0.12 or less) = regular
>3 (i.e. greater than 0.12) = irregular

Question 5

How do you identify HR using the 6 second method?

Answer 5

Count the # of QRS complexes in a 6 sec strip (30 LARGE boxes) then x by 10.

Question 6

Explain what each of the following waves represent.
P
Q
R
S
T
U

Answer 6

p = atrial deporlarzation
Q, R, S = ventricle depolarization
T = ventricle reporlazation
U = recovery/repolarization of the Purkinje fibers

Question 7

30 large boxes = how many sec?

Answer 7

6 sec

Question 8

How do you determine if a a HR is regular?

Answer 8

By seeing r measuring ff the distance between P-P’s or R-R’s differ within 30 large squares. If they do not align, irregular.

Question 9

What charcterstics makea t-wave abnormal?

Answer 9

If its tall, biphasic, inverted, flat or completely symmetrical

Question 10

A PR interval is how many small boxes? What is that equivalent to in seconds?

Answer 10

3-5 small boxes ( = 0.12 to 0.20 bc each small box is 0.04)