ECG Blog #504 (Video) — A Challenging Rhythm ...

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 — Today's case is an ECG Video!

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The 3 successive lead II rhythm strips shown in Figure-1 — are from a 10-year old child with palpitations.

QUESTIONS:

• What is the rhythm? 
• What to consider clinically?

Figure-1: Succesive rhythm strips from a 10-year old child with palpitations.

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Below is the Video presentation of today's case (9 minutes):

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Acknowledgment: My appreciation for today's case — sent to me from an anonymous follower.

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Related ECG Blog Posts to Today’s Case: 

• ECG Blog #188 — Reviews how to read and draw Laddergram (with LINKS to more than 100 laddergram cases — many with step-by-step sequential illustration).
• ECG Blog #192 — AV Dissociation by Usurpation — Default — or by AV Block?

 

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ADDENDUM (11/8/2025): 

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The 2:30 minute ECG Video below reviews:

• The Ps,Qs,3R Approach — for systematic rhythm interpretation.
• Some additional general tips on rhythm interpretation.

ECG Media PEARL #9 (4:45 minutes) — reviews the 3 Causes of AV Dissociation — and emphasizes why AV Dissociation is not the same thing as Complete AV Block.