ECG Exercise 7 - Narrow Complex Tachycardias

Last updated 10/9/24

Learning Objectives

1. Define sinus rhythm on ECG
2. Generate a differential diagnosis for tachyarrhythmias
3. Interpret ECGs

For desktop users, click on ECG for full-size

ECG 1

Differential Diagnosis of Tachycardias

The differential diagnosis can be sub-divided by QRS width and rhythm “regularity”

QRS Width

Narrow (≤120ms)

Wide( ≥ 120ms)

Regularity

Regular (constant R-R intervals)

Irregular (variable R-R intervals)

ECG 2

ECG 3

ECG 4

ECG 5

ECG 6

ECG 7

Source: LITFL.com

ECG 8

ECG 9

ECG 10

ECG 11

ECG 12

ECG 13

ECG 14

ECG 15

ECG 16

ECG 17

ECG 18

ECG 19

Additional information: history of CHF and atrial fibrillation

Source: Nathanson LA, McClennen S, Safran C, Goldberger AL. ECG Wave-Maven: Self-Assessment Program for Students and Clinicians. http://ecg.bidmc.harvard.edu.

This post is for education and not medical advice.