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

‣

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?

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.

ECG Exercise 24 - PR Interval

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

ECG 1

ECG 2

Questions

ECG 3

ECG 4

ECG 5

ECG 6

ECG 7

ECG 8

ECG 9

ECG 10

ECG 11

ECG 12

ECG 13

ECG 14

ECG 15

Questions

ECG 16

ECG 17

ECG 18

ECG 19

ECG 20

ECG 21

ECG 22

ECG 23

ECG 24

ECG 25

ECG 26

Questions

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