ECG

Question 1

In which lead is the P and T wave upside down

Answer 1

aVR

Question 2

which statement is correct?

a. lead I runs from left arm to right arm
b. lead III runs entirely along left hand side
c. lead II is positive at the right side
d. lead II goes on the right leg

Answer 2

b. lead III runs entirely along left hand side

Question 3

what is true regarding TP interval?

a. atria relax, ventricles contract
b. atria contract, ventricles relax
c. both atria and ventricles relax
d. both atria and ventricles contract

Answer 3

c. both atria and ventricles relax
(diastole for both atria and ventricles)

Question 4

the PR interval should be:

a. 0.02-0.12s
b. 0.12-0.2s
c. 0.012-0.12s
d. 0.012-0.02s

Answer 4

b. 0.12-0.2s

Question 5

which of the following is NOT a sign of polymorphic tachycardia?

a. QRS duration of >120ms (>3 small squares)
b. wide, slurred S waves in lateral leads (I, aVL, V5-6)
c. HR over 100bpm
d. asymmetrical QRS complexes

Answer 5

b. wide, slurred S waves in lateral leads (I, aVL, V5-6)

• typical of right bundle branch block+ M-shaped R wave in V1 and V2

Question 6

which of the following is a sign of 1st degree AV block?

a. M shaped R wave in V5 and V6
b. inverted T wave in V5 and V6
c. S wave depth in V1/2 + R wave height in V5/6 >35mm (35 small squares)
d. PR interval consistently over 5 small squares

Answer 6

d. PR interval consistently over 5 small squares

Question 7

one tiny horizontal square on ECG represents:

a. 0.1s
b. 0.04s
c. 0.01s
d. 0.4s

Answer 7

b. 0.04s