ECG Exercise 26 - Dude is this sinus?…Part 2

Last updated 12/26/25

It’s flu season and everyone in the ED including staff is tachycardic. You’re clawing your way through the last 10 minutes of a 3-11pm shift when you feel a tap on your shoulder. You turn around and find the local orthopedic surgeon handing you the following ECG and asking, “Dude, is this sinus?”

ECG 1

ECG 2

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

ECG 16

ECG 17

ECG 18

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ECG 20

ECG 21

ECG 22

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ECG 24

ECG 25

ECG 26

ECG 27

ECG 28

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ECG 30

ECG 31

ECG 32

ECG 33

ECG 34

ECG 35

ECG 36

ECG 37

ECG 38

ECG 39

ECG 40

This post is for education and not medical advice.