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ECG Exercise 24 - PR Interval
ECG Exercise 24 - PR Interval

ECG Exercise 24 - PR Interval

Last updated November 23, 2025

Below is an ECG Exercise focused on the PR interval. Consider reading the following ECG Topics before proceeding:

  • The PR Interval
  • Pericarditis
  • Wolff Parkinson White (WPW)
  • Lown Ganong Leveine
  • 1st degree av block
  • 2nd degree av block
  • 3rd degree av block

Comment on the PR segment and determine the diagnosis. Answer any associated quiz questions.

ECG 1

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ECG 1400
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Describe the PR and determine the diagnosis.

ECG 2

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ECG 1404
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Describe the PR and determine the diagnosis.

Questions

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Q1: What is the typical character of chest pain associated with acute pericarditis.
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Q2: What is the most typical ECG pattern in acute pericarditis?
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Q3: What three ECG findings specifically suggest the presence of a large pericardial effusion?
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Q4: How is low voltage defined in the limb and precordial leads?
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Q5: What is Spodick’s Sign?
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Q6: What ST/T ratio in V6 favors the diagnosis of pericarditis over early repolarization.

ECG 3

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ECG 1402
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Describe the PR and determine the diagnosis.

ECG 4

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ECG 859
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Describe the PR and determine the diagnosis.

ECG 5

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ECG 1361
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Describe the PR and determine the diagnosis.

ECG 6

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ECG 1401
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Describe the PR and determine the diagnosis

ECG 7

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ECG 1403
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Describe the PR and determine the diagnosis

ECG 8

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ECG 1404
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Describe the PR and determine the diagnosis

ECG 9

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ECG 1405
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Describe the PR and determine the diagnosis

ECG 10

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ECG 1406
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Describe the PR and determine the diagnosis

ECG 11

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ECG 1408
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Describe the PR and determine the diagnosis

ECG 12

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ECG 1409
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Describe the PR and determine the diagnosis

ECG 13

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ECG 1410
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What is the heart rate?
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What is differential diagnosis for the rhythm?
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Pt was given an av nodal blocker, a repeat ECG is taken:

ECG 14

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ECG 1412
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Describe the PR and determine the diagnosis.

ECG 15

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ECG 1415
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Describe the PR and determine the diagnosis

Questions

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Q1: What are the classic ECG features of Lown-Ganong-Levine Syndrome?
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Q2: What are the 3 classic ECG findings of Wolff-Parkinson-White (WPW) Syndrome?
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Q3: What is the etiology of the delta wave in WPW?
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Q4: What are the ECG differences between Type A, Type B, and Type C WPW?
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Q5: What arrhythmias are associated with WPW?
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Q6: Why is the combination of atrial fibrillation and WPW concerning?
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Q7: What class of drugs should be avoided in patients with atrial fibrillation and WPW?

ECG 16

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ECG 1413
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Describe the PR and determine the diagnosis

ECG 17

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ECG 1414
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Describe the PR. What is the rhythm?

ECG 18

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ECG 1416
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Describe the PR interval. What is the rhythm?
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What bundle branch block is present?

ECG 19

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ECG 1417
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Describe the PR. What is the rhythm?
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What is the differential diagnosis of tall R waves in the right precordial leads (V1-V3)?

ECG 20

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ECG 1418
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What is the rhythm?

ECG 21

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ECG 1419
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Describe the PR. What is the rhythm?

ECG 22

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ECG 1420
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Describe the PR. What is the rhythm?

ECG 23

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ECG 1421
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Describe the PR. What is the rhythm?

ECG 24

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ECG 1091
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Describe the PR. What is the rhythm?

ECG 25

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ECG 1287
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Describe the PR. What is the rhythm?

ECG 26

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ECG 1120
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Describe the PR. What is the rhythm? What is the diagnosis?

Questions

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Q1: What are the PR interval cutoffs for 1st degree AV block and marked 1st degree AV Block?
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Q2: What is the hallmark ECG findings of Mobitz Type 1 2nd degree AV Block
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Q3: In a 2:1 AV block, what QRS morphology strongly suggests the block is Mobitz Type?
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Q4: What is the difference between a high-grade AV block and 3rd degree AV Block?
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Q5: What is the typical heart rate of a ventricular escape rhythm?
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Q6: What is isorhythmic AV dissociation?

Related Posts

  • ECG Exercise 13 - Dude, is this sinus?
  • ECG Exercise 14 - Identify the AV block
  • ECG Exercise 15 - Premature Contraction
  • ECG Exercise 16 - Bradycardias

This post is educational and not medical advice.

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