Everyone's new favorite doppler marker for pulmonary embolism is back! We discussed the ESN (early systolic notching) when this concept was first introduced as a marker for large PEs, but now we have a prospective study that improves upon some of the limitations of the past article...or does it?

https://www.ultrasoundgel.org/115
https://pubmed.ncbi.nlm.nih.gov/33987920/