Jailyn and Ben kick off a new podcast format where they discuss the full-length lectures published on the Core Ultrasound YouTube channel — adding commentary, clinical pearls, and behind-the-scenes discussion that doesn't make it into the edited videos.

Why this new podcast format? The YouTube videos are kept concise, but a lot of valuable clinical discussion gets left on the cutting room floor. This podcast fills that gap.

In this episode, they break down their approaches to ultrasound-guided thoracentesis, with a detour into related tips for paracentesis.

 

  • Static vs. Dynamic approach

    • Static: Identify the pocket, mark the spot, proceed with a landmark technique
    • Dynamic: Watch the needle in real-time as it enters the fluid
    • When to use each: Large effusions → static often sufficient; small or complex effusions → dynamic preferred

  • Identifying the right pocket

    • Find the largest fluid pocket that is cephalad enough to clear the diaphragm and caudal enough to avoid pneumothorax
    • Watch diaphragm excursion with respiration to confirm safe needle trajectory
    • Avoid inadvertent liver/spleen biopsy

  • Probe and needle technique for thoracentesis

    • Use a phased array or curvilinear probe to find the effusion, then switch to linear for the procedure
    • Orient transducer in the intercostal space (sagittal, rotated)
    • In-plane (long axis) approach recommended — short axis is mechanically difficult due to the ribs
    • Probe orientation: oblique when lateral, nearly horizontal when posterior

  • Paracentesis pearls

    • Out-of-plane technique can work well, given the larger pockets typical in the ED
    • Curvilinear probe makes needle identification harder vs. linear
    • For small-volume paras (e.g., ruling out SBP), dynamic approach is strongly preferred

  • Color Doppler before you needle

    • Scan the intended trajectory with color Doppler to rule out intercostal arteries or abdominal wall vessels (e.g., inferior epigastrics, caput medusa)
    • Release probe pressure nearly completely when looking for veins — they collapse easily and can be missed

Resources Mentioned

Thanks for listening — and happy scanning!

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