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/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
2.Easy
II25 mm/s · 10 mm/mV

This 6-second lead II strip is irregular, so the 300 and 1500 methods do not work. Use the 6-second method to estimate the ventricular heart rate in beats per minute.

lead II, 25 mm/s, 10 mm/mVstrip length 6 s (marks at 0, 3 and 6 s)
heart rate = bpm
3.Medium
II25 mm/s · 10 mm/mVjunctional rhythmsinus tachycardianormal sinus rhythmsinus arrhythmia

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. 1junctional rhythm
  2. 2sinus tachycardia
  3. 3normal sinus rhythm
  4. 4sinus arrhythmia
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/mVfirst-degree AV blocksecond-degree AV block type IIsinus bradycardiasecond-degree AV block type I (Wenckebach)

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. 1first-degree AV block
  2. 2second-degree AV block type II
  3. 3sinus bradycardia
  4. 4second-degree AV block type I (Wenckebach)
6.Hard
II25 mm/s · 10 mm/mV

This lead II strip shows an AV block, so the atria and the ventricles beat at different rates. The QRS complexes are regular: find the ventricular rate in beats per minute (1500 method, whole number).

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

Answer key

  1. 1. irregularly irregular
  2. 2. heart rate = 80 bpm
  3. 3. normal sinus rhythm
  4. 4. QT = 0.44 s
  5. 5. second-degree AV block type II
  6. 6. ventricular rate = 54 bpm

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