A High Doppler Gradient: Obstruction or No Obstruction?. Issue 12 (15th December 2019)

• Record Type: Journal Article
• Authors: Baribeau, Yanick; Chaudhry, Daawar; Sharkey, Aidan; Chaudhary, Omar; Chu, Louis; Mahmood, Feroze
• Is Part Of: A & A practice. Volume 13:Issue 12(2019)
• Publication Date: 2019-12-15
• Subjects: Analgesia -- Periodicals; Analgesia -- Case studies -- Periodicals; Anesthesiology -- Periodicals; Anesthesiology -- Case studies -- Periodicals; 617.9605
• DOI: 10.1213/XAA.0000000000001120
• Languages: English
• ISSNs: 2575-3126

Abstract

Abstract : The angle correction feature in ultrasound systems is used when there is difficulty accurately aligning the Doppler beam with the flow to be interrogated. The operator can manually "correct" the angle to the actual direction of flow. Subsequently, the machine corrects the peak velocity for the angle. We present a case of aortic valve replacement (AVR) in which falsely high transaortic gradients were obtained immediately after separation from cardiopulmonary bypass (CPB). We recommend that there be a more prominent notification when the angle correction feature is used with machine prompts confirming when a peak velocity is obtained using angle correction.