9-10 ECG

Question 1

What effects magnitude of the potential

Answer 1

Strength of source
Distance from electrodes to dipole
angle of a line from electrode to the midpoint of the dipole

Question 2

P wave

Answer 2

Small positive or negative deflection

Question 3

Q wave

Answer 3

First negative deflection after P wave

Question 4

R wave

Answer 4

First positive deflection after P wave

Question 5

S wave

Answer 5

A large negative deflection sometimes seen after R wave

Question 6

T wave

Answer 6

Positive or negative deflection after R or S wave

Question 7

Sensitivity

Answer 7

Percent of time that a condition is detected

Question 8

Specificity

Answer 8

Percent that it wont lie and say an animal has a condition when it actually doesn’t

Question 9

How should the patient be laying for an ECG

Answer 9

Right lateral recumbent
Limbs perpendicular to body
Skin should be wet where electrodes go
Electrodes placed just below elbow/stifle

Question 10

Height of one box on ECG

Answer 10

.1 mV

Question 11

50 mm/sec width

Answer 11

1 box = .02 sec

Count 30 ‘big’ boxes and multiply by 20 for HR

Question 12

25 mm/sec width

Answer 12

1 box= .04 sec

Count 15 ‘big’ boxes and multiply by 20 for HR

Question 13

4 basic determination for ECG

Answer 13

1. Heart rate
2. Rhythm analysis
3. Measurements for analysis of cardiac size
4. Mean electrical axis determination

Question 14

The bic pen method to determine HR

Answer 14

25 mm/sec: 6 seconds

50mm/sec: 3 sec

Question 15

Instantaneous HR measurement

Answer 15

Divide 60 by the time between 2 beats

Question 16

Supra-ventricular

Answer 16

Narrow upright

>90% like normal

Question 17

Ventricular

Answer 17

Wide, Bizarre

No related P wave

Question 18

Mean electrical axis

Answer 18

Average direction that a wavefront of dipoles is moving in the heart