lab quiz cardiac

Question 1

What is an ECG?

Answer 1

measure of the sum of all the charges outside the heart

Question 2

what form of electrical activity is measured by an ECG?

Answer 2

heart rhythm and action potentials

Question 3

why do lead 1, lead II, and lead iii all look different?

Answer 3

each different places from the heart and are recorded from different directions

Question 4

why. is this important for medical personnel

Answer 4

gives precision to see where depolarizations occur

Question 5

what does the P wave represent?

Answer 5

Atrial depolarization

Question 6

what does the QRS represent

Answer 6

ventricle depolarization

Question 7

T wave?

Answer 7

ventricle repolarization

Question 8

why don’t we see a wave that represents the depolarization of the atria?

Answer 8

Because it happens at the same time ventricual waves depolarize

Question 9

Flat line meaning

Answer 9

Tine between beats and no difference between electrical activity

Question 10

heart rate equation

Answer 10

1500/number of small squares

Question 11

60-100bpm

Answer 11

normal sinus rhythm

Question 12

less than 60bpm

Answer 12

bradycardia

Question 13

more than 100bpm

Answer 13

tachycardia

Question 14

what causes the lab sound of the heartbeat?

Answer 14

AV valve closing

Question 15

What causes the dub sound of the heartbeat?

Answer 15

semilunar valve closing

Question 16

Why does the lab sound occur just after the peak of the R-wave?

Answer 16

Because the AV valve closes due to the heart contracting

Question 17

Is the time delay between the R-wave and the lab sound always the same?

Answer 17

No, because blood pressure fluctuates.

Question 18

why does the dub sound occur just after the peak of the T-wave?

Answer 18

b/c it closes when the heart relaxes the semilunar valve