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

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
2.Easy
II25 mm/s · 10 mm/mV

Measure the PR interval 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
PR = s
3.Medium
II25 mm/s · 10 mm/mVnormal sinus rhythmfirst-degree AV blocksinus rhythm with PVCsatrial fibrillation

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. 1normal sinus rhythm
  2. 2first-degree AV block
  3. 3sinus rhythm with PVCs
  4. 4atrial fibrillation
4.Medium
II25 mm/s · 10 mm/mV

Measure the QT interval and the R–R interval on this regular lead II strip, then calculate the rate-corrected QTc with Fridericia’s formula QTc = QT/∛RR (both in seconds). Give the answer in seconds to three decimals.

lead II, 25 mm/s, 10 mm/mV1 small box = 0.04 s, 1 large box = 0.20 sstrip length 6 s
QTc = s
5.Hard
II25 mm/s · 10 mm/mVCPR (non-shockable rhythm)immediate defibrillationsynchronised cardioversiontranscutaneous pacing

A patient without a palpable pulse has this organised rhythm on the monitor (pulseless electrical activity). Which treatment do adult resuscitation guidelines name for 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. 1CPR (non-shockable rhythm)
  2. 2immediate defibrillation
  3. 3synchronised cardioversion
  4. 4transcutaneous pacing
6.Hard
II25 mm/s · 10 mm/mVjunctional rhythmthird-degree (complete) AV blockpaced rhythm, failure to capturedual-chamber (AV) paced rhythm

This patient has a pacemaker. Interpret the 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. 1junctional rhythm
  2. 2third-degree (complete) AV block
  3. 3paced rhythm, failure to capture
  4. 4dual-chamber (AV) paced rhythm

Answer key

  1. 1. heart rate = 60 bpm
  2. 2. PR = 0.36 s
  3. 3. sinus rhythm with PVCs
  4. 4. QTc = 0.402 s
  5. 5. CPR (non-shockable rhythm)
  6. 6. dual-chamber (AV) paced rhythm

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