Dysrhythmias

Question 1

isoelectric line

Answer 1

when cells are at rest

Question 2

P wave represents…

Answer 2

atrial contraction

Question 3

how SHOULD p waves present

Answer 3

round, upright, precede QRS, 1 P for every QRS

Question 4

normal PRI measurement

Answer 4

0.12 - 0.20

Question 5

what can a prolonged PRI mean?

Answer 5

delay at AV node

Question 6

what does the QRS complex represent

Answer 6

ventricular contraction

Question 7

normal QRS measurement

Answer 7

0.04-0.12; under 0.12

Question 8

what does a prolonged QRS mean

Answer 8

bundle branch block

Question 9

how should the ST segment appear?

Answer 9

isoelectric

Question 10

what can an ST segment elevation indicate?

Answer 10

STEMI

Question 11

what can ST segment depression indicate

Answer 11

NSTEMI, ischemia, hypokalemia

Question 12

what does the T wave represent

Answer 12

ventricular relaxation

Question 13

what can a tented/peaked T wave mean?

Answer 13

hyperkalemia

Question 14

what can a flattened T wave indicate

Answer 14

hypokalemia

Question 15

what can an inverted T wave indicate

Answer 15

ischemia, NSTEMI

Question 16

normal QT measurement

Answer 16

0.38-0.42

Question 17

causes of prolonged QT

Answer 17

low K, Mg, or Ca, certain medications

Question 18

risks of prolonged QT

Answer 18

R on T phenomenon

Question 19

SA node rate

Answer 19

60-100

Question 20

AV node rate

Answer 20

40-60

Question 21

Purkinje fiber rate

Answer 21

20-40

Question 22

absolute refractory period

Answer 22

when cells CANNOT respond to a stimulus

Question 23

relative refractory period

Answer 23

cells can respond to a very strong stimulus, lasts from peak & downward slope of T wave - deadly dysrhythmias