ECG Part 1

Question 1

The “+” and “-“ signs __ ____ necessarily correspond to the orentitation of the dipoles created in the heart

Answer 1

Do not

Question 2

What measures the voltage from the right forelimb electrode compared with the average voltage from the other 2 limb electrodes?

Answer 2

aVR

Question 3

What measures the voltage from the left forelimb electrode compared with the average voltage from the other 2 limb electrodes?

Answer 3

aVL

Question 4

What measures the voltage from the left hind limb electrode compared with the average voltage from the other 2 limb electrodes?

Answer 4

aVF

Question 5

What wave of corresponds to atrial depolarization?

Answer 5

P wave

Question 6

What wave corresponds to depolarization that spreads from left to right across the interventricular septum?

Answer 6

Q wave

Question 7

What type of depolarization and wave is the following:
There would be a positive voltage in the left forelimb compared with the right forelimb?

Answer 7

Atrial depolarization- P wave

Question 8

What type of depolarization is the following:
NOT detected by ECG

Answer 8

Atrial repolarization

Question 9

What type of depolarization and wave is the following:
First phase usually causes a small voltage difference between the left and right forelimb, with the left being slightly negative composted with the right?

Answer 9

Inter ventricular septum depolarization- Q wave

Question 10

What type of depolarization and wave is the following:
Corresponds to outward-spreading action potential in both ventricles?

Answer 10

Ventricular depolarization- R wave

Question 11

What type of depolarization and wave is the following:
Corresponds to the end of depolarization in both ventricles?

Answer 11

Depolarization of ventricular base- S wave

Question 12

What type of depolarization and wave is the following:
As depolarization finishes spreading outward through the wall of both ventricles, the voltage in the left forelimb compared with the right forelimb returns to 0 and becomes slightly negative for a few milliseconds?

Answer 12

Depolarization of ventricular base- S wave

Question 13

What type of repolarization and wave is the following:
Corresponds to repolarization of both ventricles

Answer 13

Ventricular repolarization- T wave

Question 14

What type of repolarization and wave is the following:
Pattern is NOT predictable
Has positive and negative waves

Answer 14

Ventricular repolarization- T wave

Question 15

What type of repolarization and wave is the following:
Common pattern: repolarization spreads inward through the walls of both ventricles, the outermost portion of the ventricular wall is the last ventricular tissue to depolarize but first to repolarize?

Answer 15

Positive T wave- ventricular repolarization

Question 16

What type of repolarization and wave is the following:
Proceeds in the same direction as depolarization which creates =

Answer 16

Negative T wave- ventricular repolarization