When Microbubbles Cross: Diagnosing PFO and Pulmonary Shunts at the Bedside

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An elderly man with atrial fibrillation undergoes a bubble study in the ED. Agitated saline creates microbubbles in the right atrium that cross into the left atrium within a few beats, revealing an intracardiac shunt; the hosts review this clip and explain how early versus delayed bubble transit distinguishes PFOs or atrial septal defects from pulmonary shunts and why it matters for stroke and hypoxia workups.

Soundbytes are short, digestible clips from the Soundcheck podcast, designed to deliver quick POCUS pearls you can take straight to the bedside.
???? Full episodes: @MedStarEmergencyPhysicians | Resources: https://www.MEPsono.com
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Cardiology
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