• Ryan Butzko and Mangala Narasimhan.
• Department of Pulmonary, Critical Care and Sleep Medicine, Northwell Health, Long Island Jewish Medical Center, New Hyde Park, NY, USA.
• Perfusion. 2021 Mar 26: 2676591211003874.

IntroductionPoint-of-care ultrasound (POCUS) is widely utilized to make timely decisions regarding patient care. This approach allowed us to diagnose the cause of acutely rising transaminases in a patient in severe ARDS secondary to influenza pneumonia requiring veno-venous extracorporeal membrane oxygenation (VV-ECMO).Case ReportA 36-year-old female presented with acute hypoxemic respiratory failure secondary to influenza A infection. Within 24 hours, she required intubation and met severe ARDS criteria with a PaO2/FiO2 ratio of 62. She was managed with high PEEP and low tidal volume ventilation strategy, however her clinical status continued to deteriorate and the decision was made to pursue VV-ECMO. Within hours of cannulation her aspartate aminotransferase (AST) dramatically increased from 736 to 4512 µ/L, with concurrent mild increases in alanine aminotransferase (ALT) and creatine phosphokinase (CPK). Point-of-care ultrasound was performed which revealed a complete absence of flow in the hepatic vein, secondary to acute obstruction by an 25-French drainage catheter for the ECMO circuit. The catheter was exchanged with a smaller French catheter and the patient's transaminases and CPK levels quickly decreased and returned to normal within several days.DiscussionBudd-Chiari syndrome (BCS) is a rare but potentially life-threatening condition caused by acute obstruction of hepatic vein blood flow that can lead to fulminant liver failure if left untreated. BCS is usually caused by a hepatic vein thrombus, however any mechanical obstruction can lead to the same pathology. Point-of-care ultrasound lead to a prompt diagnosis and allowed for quick action to correct the obstruction. Although BCS is not a common problem with VV-ECMO, the syndrome should always be on the differential of any patient on VV-ECMO with acutely rising transaminases.ConclusionUltrasound played an integral role in providing a crucial diagnosis of BCS secondary to obstruction by an ECMO drainage catheter.

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