ATRIAL FIBRILLATION PRACTICE EXAM
QUESTIONS WITH CORRECT ANSWERS AND
RATIONALES
This comprehensive practice exam covers the pathophysiology, ECG identification,
classification, complications, pharmacologic management, and nursing
interventions for Atrial Fibrillation (AF). Each question includes the correct answer
in bold and a detailed rationale in italics based on current guidelines and
evidence-based practice.
Section 1: Pathophysiology & ECG Recognition
(Questions 1-15)
Question 1:
A nurse is analyzing an ECG strip. Which of the following findings are characteristic
of atrial fibrillation? (Select all that apply)
A) Regular ventricular rhythm
B) Irregular ventricular rhythm
C) Fibrillary (f) waves present
D) No identifiable P waves
E) Saw-tooth appearance of flutter waves
F) Atrial rate >400 bpm (unmeasurable)
*Rationale: Atrial fibrillation is characterized by an irregularly irregular ventricular
rhythm (no R-R interval is exactly the same), no identifiable P waves (they are
replaced by chaotic fibrillatory or "f" waves), and an unmeasurable atrial rate
typically exceeding 400 bpm. Saw-tooth waves are characteristic of atrial flutter,
not atrial fibrillation. The ventricular rate in AF may be normal, fast, or slow
depending on AV conduction and medications.*
,Question 2:
In atrial fibrillation, the electrical impulses in the atria typically fire at what rate?
A) 60-100 beats per minute
B) 150-250 beats per minute
C) 300-600 beats per minute
D) >600 beats per minute
*Rationale: In atrial fibrillation, the atrial rate is typically 300-600 beats per
minute. This rapid, chaotic electrical activity results in the atria quivering rather
than contracting effectively. The atrial rate is so fast that it cannot be measured on
standard ECG, and P waves are replaced by fibrillatory (f) waves.*
Question 3:
The nurse understands that which of the following ECG findings distinguishes
atrial flutter from atrial fibrillation?
A) Irregular ventricular rhythm
B) Absence of P waves
C) Saw-tooth flutter waves
D) Narrow QRS complexes
*Rationale: Atrial flutter is characterized by a "saw-tooth" appearance of flutter
waves (typically at a rate of 250-350 bpm), whereas atrial fibrillation shows
chaotic, irregular fibrillatory waves with no identifiable pattern. Both rhythms lack
distinct P waves and typically have narrow QRS complexes unless aberrant
conduction occurs.*
Question 4:
A patient's cardiac monitor shows a rhythm with no P waves, fine irregular
baseline fibrillatory waves, and an irregular ventricular rate of 88 bpm. The nurse
correctly identifies this rhythm as:
A) Atrial flutter
B) Atrial fibrillation with controlled ventricular response
C) Atrial fibrillation with uncontrolled ventricular response
D) Sinus arrhythmia
,*Rationale: The absence of P waves with fibrillatory waves and an irregularly
irregular rhythm is diagnostic of atrial fibrillation. A ventricular rate of 88 bpm is
considered "controlled" (typically <100-110 bpm at rest). The rate is determined
by how many atrial impulses are conducted through the AV node to the
ventricles.*
Question 5:
What happens to atrial contraction during atrial fibrillation?
A) Atrial contractions become stronger to compensate
B) Atria quiver rather than contract effectively
C) Atria contract in a regular pattern but at a faster rate
D) Atrial contraction is unaffected
*Rationale: In atrial fibrillation, the chaotic electrical activity causes the atria to
quiver or fibrillate rather than contract effectively. This leads to loss of the "atrial
kick" (the 20-30% contribution of atrial contraction to ventricular filling), which
can reduce cardiac output, particularly in patients with diastolic dysfunction.*
Question 6:
A nurse notes a pulse deficit in a patient with atrial fibrillation. What does this
finding indicate?
A) The patient is in cardiogenic shock
B) Some ventricular contractions are too weak to produce a palpable peripheral
pulse
C) The patient has an underlying bradycardia
D) The patient has developed a first-degree AV block
Rationale: A pulse deficit occurs when the apical heart rate exceeds the radial
pulse rate. In atrial fibrillation, some ventricular contractions occur so soon after
the previous contraction that ventricular filling is inadequate, resulting in a weak
stroke volume that does not generate a palpable peripheral pulse. This is a
common finding in AF.
, Question 7:
Which of the following ECG characteristics is NOT associated with atrial
fibrillation?
A) Regular R-R intervals
B) Absence of P waves
C) Irregularly irregular rhythm
D) Fibrillatory (f) waves
Rationale: Atrial fibrillation is defined by its irregularly irregular rhythm. Regular R-
R intervals would indicate a different rhythm such as atrial flutter with fixed block,
junctional rhythm, or sinus rhythm. The other options (absence of P waves,
irregular rhythm, and f waves) are all characteristic of AF.
Question 8:
During atrial fibrillation, the decreased cardiac output is primarily due to:
A) Decreased peripheral vascular resistance
B) Loss of atrial kick and rapid ventricular rate
C) Increased stroke volume
D) Enhanced ventricular contractility
*Rationale: Cardiac output decreases in atrial fibrillation due to two main factors:
(1) loss of the "atrial kick" (atrial contraction contributes 20-30% to ventricular
filling), and (2) rapid ventricular rates reduce diastolic filling time. Together, these
decrease stroke volume and cardiac output.*
Question 9:
A patient with atrial fibrillation has a ventricular rate of 150 bpm. The nurse
correctly documents this as:
A) Atrial fibrillation with rapid ventricular response (RVR)
B) Atrial fibrillation with controlled rate
C) Atrial flutter with variable block
D) Junctional tachycardia
QUESTIONS WITH CORRECT ANSWERS AND
RATIONALES
This comprehensive practice exam covers the pathophysiology, ECG identification,
classification, complications, pharmacologic management, and nursing
interventions for Atrial Fibrillation (AF). Each question includes the correct answer
in bold and a detailed rationale in italics based on current guidelines and
evidence-based practice.
Section 1: Pathophysiology & ECG Recognition
(Questions 1-15)
Question 1:
A nurse is analyzing an ECG strip. Which of the following findings are characteristic
of atrial fibrillation? (Select all that apply)
A) Regular ventricular rhythm
B) Irregular ventricular rhythm
C) Fibrillary (f) waves present
D) No identifiable P waves
E) Saw-tooth appearance of flutter waves
F) Atrial rate >400 bpm (unmeasurable)
*Rationale: Atrial fibrillation is characterized by an irregularly irregular ventricular
rhythm (no R-R interval is exactly the same), no identifiable P waves (they are
replaced by chaotic fibrillatory or "f" waves), and an unmeasurable atrial rate
typically exceeding 400 bpm. Saw-tooth waves are characteristic of atrial flutter,
not atrial fibrillation. The ventricular rate in AF may be normal, fast, or slow
depending on AV conduction and medications.*
,Question 2:
In atrial fibrillation, the electrical impulses in the atria typically fire at what rate?
A) 60-100 beats per minute
B) 150-250 beats per minute
C) 300-600 beats per minute
D) >600 beats per minute
*Rationale: In atrial fibrillation, the atrial rate is typically 300-600 beats per
minute. This rapid, chaotic electrical activity results in the atria quivering rather
than contracting effectively. The atrial rate is so fast that it cannot be measured on
standard ECG, and P waves are replaced by fibrillatory (f) waves.*
Question 3:
The nurse understands that which of the following ECG findings distinguishes
atrial flutter from atrial fibrillation?
A) Irregular ventricular rhythm
B) Absence of P waves
C) Saw-tooth flutter waves
D) Narrow QRS complexes
*Rationale: Atrial flutter is characterized by a "saw-tooth" appearance of flutter
waves (typically at a rate of 250-350 bpm), whereas atrial fibrillation shows
chaotic, irregular fibrillatory waves with no identifiable pattern. Both rhythms lack
distinct P waves and typically have narrow QRS complexes unless aberrant
conduction occurs.*
Question 4:
A patient's cardiac monitor shows a rhythm with no P waves, fine irregular
baseline fibrillatory waves, and an irregular ventricular rate of 88 bpm. The nurse
correctly identifies this rhythm as:
A) Atrial flutter
B) Atrial fibrillation with controlled ventricular response
C) Atrial fibrillation with uncontrolled ventricular response
D) Sinus arrhythmia
,*Rationale: The absence of P waves with fibrillatory waves and an irregularly
irregular rhythm is diagnostic of atrial fibrillation. A ventricular rate of 88 bpm is
considered "controlled" (typically <100-110 bpm at rest). The rate is determined
by how many atrial impulses are conducted through the AV node to the
ventricles.*
Question 5:
What happens to atrial contraction during atrial fibrillation?
A) Atrial contractions become stronger to compensate
B) Atria quiver rather than contract effectively
C) Atria contract in a regular pattern but at a faster rate
D) Atrial contraction is unaffected
*Rationale: In atrial fibrillation, the chaotic electrical activity causes the atria to
quiver or fibrillate rather than contract effectively. This leads to loss of the "atrial
kick" (the 20-30% contribution of atrial contraction to ventricular filling), which
can reduce cardiac output, particularly in patients with diastolic dysfunction.*
Question 6:
A nurse notes a pulse deficit in a patient with atrial fibrillation. What does this
finding indicate?
A) The patient is in cardiogenic shock
B) Some ventricular contractions are too weak to produce a palpable peripheral
pulse
C) The patient has an underlying bradycardia
D) The patient has developed a first-degree AV block
Rationale: A pulse deficit occurs when the apical heart rate exceeds the radial
pulse rate. In atrial fibrillation, some ventricular contractions occur so soon after
the previous contraction that ventricular filling is inadequate, resulting in a weak
stroke volume that does not generate a palpable peripheral pulse. This is a
common finding in AF.
, Question 7:
Which of the following ECG characteristics is NOT associated with atrial
fibrillation?
A) Regular R-R intervals
B) Absence of P waves
C) Irregularly irregular rhythm
D) Fibrillatory (f) waves
Rationale: Atrial fibrillation is defined by its irregularly irregular rhythm. Regular R-
R intervals would indicate a different rhythm such as atrial flutter with fixed block,
junctional rhythm, or sinus rhythm. The other options (absence of P waves,
irregular rhythm, and f waves) are all characteristic of AF.
Question 8:
During atrial fibrillation, the decreased cardiac output is primarily due to:
A) Decreased peripheral vascular resistance
B) Loss of atrial kick and rapid ventricular rate
C) Increased stroke volume
D) Enhanced ventricular contractility
*Rationale: Cardiac output decreases in atrial fibrillation due to two main factors:
(1) loss of the "atrial kick" (atrial contraction contributes 20-30% to ventricular
filling), and (2) rapid ventricular rates reduce diastolic filling time. Together, these
decrease stroke volume and cardiac output.*
Question 9:
A patient with atrial fibrillation has a ventricular rate of 150 bpm. The nurse
correctly documents this as:
A) Atrial fibrillation with rapid ventricular response (RVR)
B) Atrial fibrillation with controlled rate
C) Atrial flutter with variable block
D) Junctional tachycardia
