1
NURS
NURS 403 EXAM 2 QUESTIONS WITH CORRECT
VERIFIED SOLUTIONS 100% GUARANTEED PASS
(2025/2026)
What does the QRS complex represent? - ANS ✓Ventricular depolarization, or
contraction of the ventricles.
What does the ST segment identify? - ANS ✓End of ventricular depolarization
and the beginning of ventricular repolarization. Should remain flat.
What does the T wave identify? - ANS ✓Ventricular repolarization (relaxing
and filling with blood - diastole)
How do you determine heart rate with the 10 times method? - ANS ✓Count
the R waves and multiply by 10
Ex. 6 R waves in a 6 second strip would be 60 bpm
6 x 10
How do you determine heart rate with the rule of 300 method? - ANS
✓Count the large boxes between R waves and divide into 300
How do you determine heart rate with the rule of 1500 method? - ANS
✓Count the small boxes between R waves and divide into 1500
When assessing a P wave, how should it look? - ANS ✓It should come before
the QRS complex
NURS 403
, 2
NURS
It should leave the isoelectric line and return
Should be 0.10 seconds or less
Should be rounded
Deflection should be positive
All P waves should appear the same, should have one per QRS complex
How long should a P wave be? - ANS ✓Less than 0.10 seconds (2.5 boxes)
When assessing a PR interval, how should it look? - ANS ✓It should start at
the beginning of the P wave, ends at the QRS complex
Should last 0.12 - 0.2 seconds (3-5 boxes)
Should be similar from beat to beat, if not, that's an arrythmia
How long should a PR interval be? - ANS ✓0.12 - 0.20 seconds (3-5 boxes)
How long should a QRS complex be? - ANS ✓0.10 seconds or less (2.5 boxes)
When assessing a QRS complex, how should it look? - ANS ✓It should follow
the PR Interval
Lasts 10 second or less (2.5 blocks)
NURS 403
, 3
NURS
Q wave - negative deflection after the P wave (falls below isoelectric line)
R Wave - positive deflection after Q wave
S Wave - negative deflection after R wave
When assessing an ST segment, how should it look? - ANS ✓FLAT! If elevated
or depressed, that would indicate heart muscle damage or necrosis
Deflection should be isoelectric
Goes from S save to the beginning of the T wave
When assessing a T wave, how should it look? - ANS ✓It should follow the S
Wave
Should last 0.16 seconds (4 boxes)
Should be rounded
Deflection: upright
How long should a T wave be? - ANS ✓0.16 seconds (4 boxes)
What does the QT interval represent? - ANS ✓Represents total ventricular
activity from contraction to relaxation
What would a prolonged QT interval indicate? - ANS ✓Life threatening
dysrhythmias
V-tach, V-fib
NURS 403
, 4
NURS
What would a shorted QT Interval indicate? - ANS ✓associated with digoxin
toxicity
A nurse is examining the ECG of a client having an acute MI. The nurse
would be correct to identify an elevated ST segment as most likely
indicating which alteration.
A.Necrosis
B.Hypokalemia
C.Hypomagnesemia
D.Insufficiency - ANS ✓A. Necrosis
ST segment is the end of ventricular contraction (depolarization), and
beginning of repolarization. If this cannot occur, negative/positive
deflection can occur and that would indicate heart muscle damage/necrosis
What is Sinus Bradycardia? - ANS ✓Regular heart rhythm, BUT it is less than 60
bpm
What symptoms may be present with sinus bradycardia? - ANS ✓Patient may
be/have;
Hypotensive
Chest Pain
Diaphoretic
Confused
Lightheaded
Restless
AMS
Syncope
NURS 403
NURS
NURS 403 EXAM 2 QUESTIONS WITH CORRECT
VERIFIED SOLUTIONS 100% GUARANTEED PASS
(2025/2026)
What does the QRS complex represent? - ANS ✓Ventricular depolarization, or
contraction of the ventricles.
What does the ST segment identify? - ANS ✓End of ventricular depolarization
and the beginning of ventricular repolarization. Should remain flat.
What does the T wave identify? - ANS ✓Ventricular repolarization (relaxing
and filling with blood - diastole)
How do you determine heart rate with the 10 times method? - ANS ✓Count
the R waves and multiply by 10
Ex. 6 R waves in a 6 second strip would be 60 bpm
6 x 10
How do you determine heart rate with the rule of 300 method? - ANS
✓Count the large boxes between R waves and divide into 300
How do you determine heart rate with the rule of 1500 method? - ANS
✓Count the small boxes between R waves and divide into 1500
When assessing a P wave, how should it look? - ANS ✓It should come before
the QRS complex
NURS 403
, 2
NURS
It should leave the isoelectric line and return
Should be 0.10 seconds or less
Should be rounded
Deflection should be positive
All P waves should appear the same, should have one per QRS complex
How long should a P wave be? - ANS ✓Less than 0.10 seconds (2.5 boxes)
When assessing a PR interval, how should it look? - ANS ✓It should start at
the beginning of the P wave, ends at the QRS complex
Should last 0.12 - 0.2 seconds (3-5 boxes)
Should be similar from beat to beat, if not, that's an arrythmia
How long should a PR interval be? - ANS ✓0.12 - 0.20 seconds (3-5 boxes)
How long should a QRS complex be? - ANS ✓0.10 seconds or less (2.5 boxes)
When assessing a QRS complex, how should it look? - ANS ✓It should follow
the PR Interval
Lasts 10 second or less (2.5 blocks)
NURS 403
, 3
NURS
Q wave - negative deflection after the P wave (falls below isoelectric line)
R Wave - positive deflection after Q wave
S Wave - negative deflection after R wave
When assessing an ST segment, how should it look? - ANS ✓FLAT! If elevated
or depressed, that would indicate heart muscle damage or necrosis
Deflection should be isoelectric
Goes from S save to the beginning of the T wave
When assessing a T wave, how should it look? - ANS ✓It should follow the S
Wave
Should last 0.16 seconds (4 boxes)
Should be rounded
Deflection: upright
How long should a T wave be? - ANS ✓0.16 seconds (4 boxes)
What does the QT interval represent? - ANS ✓Represents total ventricular
activity from contraction to relaxation
What would a prolonged QT interval indicate? - ANS ✓Life threatening
dysrhythmias
V-tach, V-fib
NURS 403
, 4
NURS
What would a shorted QT Interval indicate? - ANS ✓associated with digoxin
toxicity
A nurse is examining the ECG of a client having an acute MI. The nurse
would be correct to identify an elevated ST segment as most likely
indicating which alteration.
A.Necrosis
B.Hypokalemia
C.Hypomagnesemia
D.Insufficiency - ANS ✓A. Necrosis
ST segment is the end of ventricular contraction (depolarization), and
beginning of repolarization. If this cannot occur, negative/positive
deflection can occur and that would indicate heart muscle damage/necrosis
What is Sinus Bradycardia? - ANS ✓Regular heart rhythm, BUT it is less than 60
bpm
What symptoms may be present with sinus bradycardia? - ANS ✓Patient may
be/have;
Hypotensive
Chest Pain
Diaphoretic
Confused
Lightheaded
Restless
AMS
Syncope
NURS 403
