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.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

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

The rhythm on this lead II strip is regular. Use the 300 method (300 ÷ the number of large boxes between two consecutive R waves) to estimate 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/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
4.Medium
II25 mm/s · 10 mm/mVjunctional rhythmatrial fibrillationsinus bradycardiafirst-degree AV block

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. 2atrial fibrillation
  3. 3sinus bradycardia
  4. 4first-degree AV block
5.Hard
II25 mm/s · 10 mm/mVsinus rhythm with wide QRSventricular paced rhythmthird-degree (complete) AV blockdual-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. 1sinus rhythm with wide QRS
  2. 2ventricular paced rhythm
  3. 3third-degree (complete) AV block
  4. 4dual-chamber (AV) paced rhythm
6.Hard
II25 mm/s · 10 mm/mVsupraventricular tachycardia (SVT)idioventricular rhythmtorsades de pointesatrial flutter, 2:1 conduction

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. 1supraventricular tachycardia (SVT)
  2. 2idioventricular rhythm
  3. 3torsades de pointes
  4. 4atrial flutter, 2:1 conduction

Answer key

  1. 1. PR = 0.16 s
  2. 2. heart rate = 100 bpm
  3. 3. QT = 0.38 s
  4. 4. junctional rhythm
  5. 5. ventricular paced rhythm
  6. 6. torsades de pointes

Full step-by-step solutions: practise this topic on examproblems.com.