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 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
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/mVnormal sinus rhythmsinus bradycardiafirst-degree AV blocksinus tachycardia

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. 2sinus bradycardia
  3. 3first-degree AV block
  4. 4sinus tachycardia
4.Medium
II25 mm/s · 10 mm/mV

Measure the QT 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
QT = s
5.Hard
II25 mm/s · 10 mm/mVdual-chamber (AV) paced rhythmventricular paced rhythmpaced rhythm, failure to capturesinus rhythm with wide QRS

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. 1dual-chamber (AV) paced rhythm
  2. 2ventricular paced rhythm
  3. 3paced rhythm, failure to capture
  4. 4sinus rhythm with wide QRS
6.Hard
II25 mm/s · 10 mm/mVtranscutaneous pacingCPR (non-shockable rhythm)synchronised cardioversionimmediate defibrillation

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. 1transcutaneous pacing
  2. 2CPR (non-shockable rhythm)
  3. 3synchronised cardioversion
  4. 4immediate defibrillation

Answer key

  1. 1. PR = 0.2 s
  2. 2. heart rate = 88 bpm
  3. 3. first-degree AV block
  4. 4. QT = 0.42 s
  5. 5. ventricular paced rhythm
  6. 6. CPR (non-shockable rhythm)

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