Exam 1- EKG interpretation

Question 1

depolarization of both right and left atria

Answer 1

P wave

Question 2

good indicator of AV node health

Answer 2

PR interval

Question 3

normal .12-.20 seconds

Answer 3

PR interval

Question 4

represents ventricular depolarization

Answer 4

QRS complex

Question 5

normal .04-.10

Answer 5

QRS complex

Question 6

represents ventricular repolarization

Answer 6

T wave

Question 7

represents depolarization and repolarization of the ventricles

Answer 7

QT interval

Question 8

Normal Sinus Rhythm

Answer 8

Only rhythm considered normal
Upright P wave precedes every QRS complex
All PR intervals range from .12-.20
QRS is less than .12
All P waves look alike
Rate is 60-100 beats per minute

Question 9

Sinus Bradycardia

Answer 9

The rate is less than 60 bpm
Causes: vomiting and drugs such as dig, morphine, and sedatives
Treat with Atropine or other cardiac stimulant

Question 10

Sinus Tachycardia

Answer 10

The rate is between 100-150 bpm

Causes: pain, fear, anemia, hemorrhage, exercise, anxiety, drugs like atropine, nicotine, caffeine, or amphetamines

Question 11

Sinus Arrhythmia

Answer 11

The SA node initiates all the electrical impulses, but at irregular intervals
Change with respirations
Normal in infants and children, but can be a warning of diseased SA node or CAD in adults.
Treat HTN, shock, eliminate caffeine

Question 12

Sinus Arrest/Pause

Answer 12

The SA node initiates an electrical impulse that is blocked and not conducted to atria.
The atria do not depolarize and a P wave will not be seen.
Impulse is not conducted to the ventricles to cause depolarization so no QRS.
Period of asystole
Causes: MI, hypoxia, drugs: dig or quinidine