ELECTROCARDIOGRAM

Question 1

organized cardiac contraction is dependent on …

Answer 1

timing of action potential from atria to ventricles

Question 2

ECG examines what

Answer 2

the coordinated contraction through heart

helps gain info about health of heart

Question 3

p wave

Answer 3

depolarization of artia

Question 4

QRS complex

Answer 4

depolarization of ventricles

Question 5

t wave

Answer 5

repolarization of ventricles

Question 6

QRS complex, peak descriptions

Answer 6

• first downward peak : Q wave
• first upward peak: R wave
• downward peak after R wave: S wave

Question 7

each cycle should have a p wave followed by

Answer 7

a QRS complex

Question 8

PR interval is greater than

Answer 8

0.12 seconds

Question 9

sinus tachycardia

Answer 9

greater than 100 bpm

Question 10

normal interval times

Answer 10

PR range: 0.12 - 0.20 seconds
QRS less or equal to 0.10 seconds
QT : less or equal to 0.44 seconds

Question 11

hypercalcemia does what to QT

Answer 11

decreases

Question 12

hypocalcemia does what to QT

Answer 12

increases

Question 13

bundle branch block

Answer 13

• if right or left conduction bundles are damaged, conduction does not occur and electrical transmission is cell to cell slowing the process
• may see 2 R waves , separated bc of conduction delay

Question 14

myocardial infarction

Answer 14

• q wave larger and longer duration