Normal ECG Review - Johnston

Question 1

the P wave is upright in what leads

Answer 1

1,2, V4-V6, AVF

Question 2

what is a normal P-R interval

abnormal means?

Answer 2

.12-.20 seconds

• if longer than 1st degree AV block
• if shorter then pre-excitatory syndrome (WPWS)

Question 3

normal QRS complex

Answer 3

.05-.11 seconds

if longer than BBB or ventricular hypertrophy

Question 4

Q waves shouldn’t be more than ____ sec in width

Answer 4

.03

Question 5

ST depression means

Answer 5

subendocardial infarction

Question 6

ST elevation means

Answer 6

subepicardial or transmural injury or ischemia

Question 7

T wave is upright in leads

Answer 7

1,2 V3-V6

inverted in AVR, variable in rest

Question 8

T wave inversion from

Answer 8

ischemia

Question 9

Q wave or QS complex

Answer 9

pattern of necrosis or infarction

Question 10

best leads for reading p waves

Answer 10

lead II and V1

Question 11

what is considered bradycardia

Answer 11

HR under 60

Question 12

thick dark lines HR

Answer 12

300, 150, 100, 75, 60

Question 13

situation in which a P wave follows a QRS

Answer 13

SVT (AV nodal re-entry tachy)

junctional rhythm

Question 14

situation in which there are no P waves

Answer 14

A fib, A flutter, junctional or ventricular escape rhythms, junctional tachy, VT