ekg

Question 0

P wave (2)

Answer 0

1. atrial depolarization

2. SA node -> AV node, from R atrium to L atrium

Question 1

what is EKG measuring?

Answer 1

indirect associatins btwn surface electrical activity and mechanics of what happening in the heart

Question 2

QRS complex (3)

Answer 2

1. rapid depolarization of right and left ventricles
2. because ventricles are so large, QRS has large amplitude
3. Includes plateau

Question 3

PR segment

Answer 3

1. AV delay

Question 4

T wave (3)

Answer 4

1. repolarization (recovery) of ventricles
2. beginning of QRS complex -> apex of T wave = absolute refractory period
3. apex -> end of T wave = relative refractory period

Question 5

placement of precordial leads (6)

Answer 5

1. V1= 4th IC space, R of sternum
2. V2= 4th IC space, L of sternum
3. V3= directly btwn V1 and V2
4. V4= 5th IC space, L midclavicular line
5. V5= level with V4, L ant-axillary line
6. V6= level with V4, L mid-axillary line

Question 6

anatomical correlation btwn precordial lead placement and heart (and charge) (3)

Answer 6

1. V2= above top (base) of heart (-)
2. V4 = most (+)
3. V5 = below tip of heart (+)