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

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/mVaccelerated junctional rhythmsupraventricular tachycardia (SVT)sinus tachycardiaventricular 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. 1accelerated junctional rhythm
  2. 2supraventricular tachycardia (SVT)
  3. 3sinus tachycardia
  4. 4ventricular tachycardia
4.Medium
II25 mm/s · 10 mm/mV

This lead II strip shows atrial flutter. How many flutter waves per QRS complex are there (the n of n:1 conduction)?

lead II, 25 mm/s, 10 mm/mV1 small box = 0.04 s, 1 large box = 0.20 sstrip length 6 s
flutter waves per QRS =
5.Hard
II25 mm/s · 10 mm/mVtorsades de pointesatrial flutter, 2:1 conductionventricular fibrillationidioventricular rhythm

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. 1torsades de pointes
  2. 2atrial flutter, 2:1 conduction
  3. 3ventricular fibrillation
  4. 4idioventricular rhythm
6.Hard
II25 mm/s · 10 mm/mVpulseless electrical activity (PEA)asystolejunctional rhythmventricular fibrillation

A monitored patient is found unresponsive and not breathing normally, and no carotid pulse can be felt. The monitor shows this organised rhythm. What is this situation called? 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. 1pulseless electrical activity (PEA)
  2. 2asystole
  3. 3junctional rhythm
  4. 4ventricular fibrillation

Answer key

  1. 1. QRS = 0.16 s
  2. 2. PR = 0.2 s
  3. 3. supraventricular tachycardia (SVT)
  4. 4. flutter waves per QRS = 2
  5. 5. torsades de pointes
  6. 6. pulseless electrical activity (PEA)

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