ECG rhythm strip interpretation worksheet with answers

Free printable ECG rhythm strip interpretation worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
II25 mm/s · 10 mm/mV

Measure the QRS duration on this lead II strip, in seconds.

lead II, 25 mm/s, 10 mm/mV1 small box = 0.04 s, 1 large box = 0.20 sstrip length 6 s
QRS = s
2.Easy
II25 mm/s · 10 mm/mV

This lead II rhythm is regular. Count the small boxes between two consecutive R waves and use the 1500 method to find the heart rate in beats per minute, rounded to a whole number.

lead II, 25 mm/s, 10 mm/mV1 small box = 0.04 s, 1 large box = 0.20 sstrip length 6 s
heart rate = bpm
3.Medium
II25 mm/s · 10 mm/mV

This lead II strip shows atrial flutter with a fixed conduction ratio. Find the ventricular rate in beats per minute.

lead II, 25 mm/s, 10 mm/mV1 small box = 0.04 s, 1 large box = 0.20 sstrip length 6 s
ventricular rate = bpm
4.Medium
II25 mm/s · 10 mm/mVatrial fibrillationfirst-degree AV blocknormal sinus rhythmjunctional rhythm

Interpret this lead II rhythm strip. Which rhythm is it? Click your answer.

lead II, 25 mm/s, 10 mm/mV1 small box = 0.04 s, 1 large box = 0.20 sstrip length 6 s
  1. 1atrial fibrillation
  2. 2first-degree AV block
  3. 3normal sinus rhythm
  4. 4junctional rhythm
5.Hard
II25 mm/s · 10 mm/mVsupraventricular tachycardia (SVT)sinus tachycardiaatrial flutter, 2:1 conductionventricular tachycardia

Identify the rhythm on this lead II strip. Click your answer.

lead II, 25 mm/s, 10 mm/mV1 small box = 0.04 s, 1 large box = 0.20 sstrip length 6 s
  1. 1supraventricular tachycardia (SVT)
  2. 2sinus tachycardia
  3. 3atrial flutter, 2:1 conduction
  4. 4ventricular tachycardia
6.Hard
II25 mm/s · 10 mm/mVsecond-degree AV block type IIsinus bradycardiafirst-degree AV blockthird-degree (complete) AV block

This lead II strip shows a conduction problem between the atria and the ventricles. Which rhythm is it? Click your answer.

lead II, 25 mm/s, 10 mm/mV1 small box = 0.04 s, 1 large box = 0.20 sstrip length 6 s
  1. 1second-degree AV block type II
  2. 2sinus bradycardia
  3. 3first-degree AV block
  4. 4third-degree (complete) AV block

Answer key

  1. 1. QRS = 0.08 s
  2. 2. heart rate = 65 bpm
  3. 3. ventricular rate = 63 bpm
  4. 4. junctional rhythm
  5. 5. ventricular tachycardia
  6. 6. second-degree AV block type II

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