EKG Strip Diagram:
• Rhythm: Irregularly irregular
• Atrial Rate: Unable to determine, baseline is chaotic and wavy
• Ventricular Rate: 140 bpm
• P-waves: Absent, no discernible P-waves
• PR Interval: Not measurable
• QRS Complex: 0.08 sec (narrow)
What rhythm does this strip represent?
A) Atrial Flutter
B) Atrial Fibrillation
C) Ventricular Tachycardia
D) Sinus Tachycardia
E) 2nd Degree Heart Block Type I
Correct Answer: B) Atrial Fibrillation
Rationale: The rhythm is identified as Atrial Fibrillation due to the irregularly irregular
pulse, the heart rate greater than 100 bpm (uncontrolled), and the absent P-waves with a
chaotic baseline.
Question 2
EKG Strip Diagram:
• Rhythm: Regular
• Atrial Rate: ~300 bpm
• Ventricular Rate: 150 bpm
• P-waves: Replaced by a classic "saw-tooth" pattern of flutter waves
, • PR Interval: Not measurable
• QRS Complex: 0.06 sec (narrow)
What rhythm does this strip represent?
A) Atrial Fibrillation
B) Sinus Tachycardia
C) Atrial Flutter
D) Ventricular Fibrillation
E) 1st Degree Heart Block
Correct Answer: C) Atrial Flutter
Rationale: The rhythm is identified as Atrial Flutter due to the rapid atrial rate (240-350
bpm) and the characteristic saw-tooth pattern of the atrial waves.
Question 3
EKG Strip Diagram:
• Rhythm: Underlying rhythm is regular, interrupted by an early beat.
• Rate: Underlying rate is 75 bpm.
• P-waves: Normal sinus P-waves with the underlying rhythm. The early beat has no P-
wave.
• PR Interval: 0.16 sec on the sinus beats.
• QRS Complex: 0.08 sec on the sinus beats. The early beat has a wide, bizarre QRS
measuring 0.14 sec.
This strip shows an underlying sinus rhythm with which ectopic beat?
A) Premature Atrial Complex (PAC)
B) Premature Junctional Complex (PJC)