unit 4

Question 1

what starts the pumping of the heart muscle

Answer 1

electrical activity

Question 2

what causes the electrical current of the heart

Answer 2

chemical changes in cells of the heart

Question 3

what is the electrical state of a resting cell

Answer 3

negative

Question 4

what is the mechanical response to depolarization

Answer 4

contraction (systole)

Question 5

what happens to the electrical state of cells during repolarization

Answer 5

positive cell returns to negative state

Question 6

what type of electrode is only used once for a short time

Answer 6

resting

Question 7

when would you chose monitoring over resting electrodes

Answer 7

for continuous monitoring, when electrodes must stay on the patient longer

Question 8

what is telemetry used for

Answer 8

ongoing monitoring in the hospital but the patient can move around. 5 leads.

Question 9

what is a holter monitor used for

Answer 9

longer look at cardiac activity outside of the office. 5 leads.

Question 10

what is event monitoring used for

Answer 10

long term cardiac monitoring

Question 11

what is continuous monitoring used for

Answer 11

ER, ICU, OR, bedside monitoring without movement. 3-5 leads/

Question 12

what is a 12 lead EKG used for

Answer 12

evaluate rate, rhythm, and signs of heart disease.

Question 13

what is a stress test used for

Answer 13

evaluates for heart disease when heart rate is increased

Question 14

what electrode is positive in lead 1, which is negative

Answer 14

left arm, right arm

Question 15

in lead 2 which electrode is positive, which is negative

Answer 15

left leg, right arm

Question 16

in leaf 3 which electrode is positive, which is negative

Answer 16

left leg, left arm

Question 17

which electrode are you always viewing the heart from

Answer 17

positive

Question 18

what is the positive electrode in aVR

Answer 18

right arm

Question 19

what is the positive electrode in aVL

Answer 19

left arm

Question 20

what electrode is positive in aVF

Answer 20

left foot

Question 21

what is the negative electrode in the precordial leads

Answer 21

wilson’s central terminal

Question 22

which leads look at the inferior wall of the heart

Answer 22

2, 3, and aVF

Question 23

which leads look at the front of the left ventricle

Answer 23

v1, v2, v3, v4

Question 24

which leads look at the left lateral wall

Answer 24

1, aVL, v5, v6

Question 25

which coronary artery is the primary source of blood for the anterior wall

Answer 25

left anterior descending

Question 26

which coronary artery is the primary source of blood for the inferior wall

Answer 26

right coronary artery

Question 27

what us the primary source of blood in the lateral wall of left ventricle

Answer 27

circumflex

Question 28

when would you speed up EKG paper

Answer 28

fast rhythms

Question 29

when would you increase the gain of EKG tracing

Answer 29

when you need to make it easier to identify waves

Question 30

when would you decrease the gain of EKG paper

Answer 30

waves are vertically overlapping the lead

Question 31

how should a patient be positioned for an EKGQ

Answer 31

laying down, supine or semi-fowlers

Question 32

what do you need to avoid when applying electrodes to the skin

Answer 32

body hair, scars, implanted devices, nonintact skin

Question 33

what must you do when an EKG is complete

Answer 33

check for clear tracing and fix issues before removing electrodes. check for signs of dangerous arrhythmias

Question 34

who removes the wires and electrodes from patient

Answer 34

tech removes wires, patients remove electrodes

Question 35

what are stress tests used for

Answer 35

heart function, future heart problems, planning for invasive heart procedures, routine screening, family history, heart surgery follow up

Question 36

how is stress induced in a stress test

Answer 36

exercise or injection of medication that increases HR

Question 37

how is a nuclear stress test different from a plain stress test

Answer 37

done in addition to a normal stress test, provides brain imaging to see where blood is not flowing. done with arms above the head while laying down

Question 38

when is the imaging done in a nuclear stress tst

Answer 38

before and after test