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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Name: ____________________   Date: ____________

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/mVregularregularly irregularirregularly irregular

Look at the R–R intervals on this lead II strip. How would you describe the ventricular rhythm? 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. 1regular
  2. 2regularly irregular
  3. 3irregularly irregular
3.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 Bazett’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
4.Medium
II25 mm/s · 10 mm/mVatrial flutter, 2:1 conductionatrial flutter, 3:1 conductionnormal sinus rhythmsinus 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. 1atrial flutter, 2:1 conduction
  2. 2atrial flutter, 3:1 conduction
  3. 3normal sinus rhythm
  4. 4sinus tachycardia
5.Hard
II25 mm/s · 10 mm/mVimmediate defibrillationsynchronised cardioversiontranscutaneous pacingCPR (non-shockable rhythm)

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. 1immediate defibrillation
  2. 2synchronised cardioversion
  3. 3transcutaneous pacing
  4. 4CPR (non-shockable rhythm)
6.Hard
II25 mm/s · 10 mm/mVfirst-degree AV blocksecond-degree AV block type II2:1 AV block (type undetermined)sinus bradycardia

Interpret this lead II strip. Which interpretation can you defend from this single 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. 1first-degree AV block
  2. 2second-degree AV block type II
  3. 32:1 AV block (type undetermined)
  4. 4sinus bradycardia

Answer key

  1. 1. heart rate = 48 bpm
  2. 2. regular
  3. 3. QTc = 0.49 s
  4. 4. atrial flutter, 3:1 conduction
  5. 5. CPR (non-shockable rhythm)
  6. 6. 2:1 AV block (type undetermined)

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