Episode 25: Evaluating residual anti-Xa levels following discontinuation of treatment-dose enoxaparin in patients presenting for elective surgery: a prospective observational trial

RAPM Focus

In this episode of RAPM Focus, Dr. Brian Sites sits down with Daryl Henshaw, MD, and Christopher Edwards, MD, to discuss “Evaluating residual anti-Xa levels following discontinuation of treatment-dose enoxaparin in patients presenting for elective surgery: a prospective observational trial,” first published in June 2023.

Dr. Daryl Henshaw completed his medical school residency in regional anesthesia and acute pain fellowship training at Wake Forest. He is the associate vice chair of clinical operations at Atrium Health Wake Forest Baptist, the section head of regional anesthesia and acute pain management, and the medical director of acute pain services.

Dr. Christopher Edwards is a graduate of Louisiana State University Health Sciences at Wake Forest for both anesthesia and fellowship training in RAPM. He is the medical director for regional anesthesia and acute pain.

Dr. Henshaw and colleagues performed a prospective observational trial, where they asked the question if current guidelines to hold full anti-coagulation dose of Lovenox for 24 hours before surgery resulted in adequate anti-Xa level activity to support the performance of neuraxial or deep anesthetic type nerve block procedures. Consenting patients on treatment-dose enoxaparin were randomized to either a 24-hour group (last dose at 07:00 the day prior to surgery) or a 36-hour group (last dose at 19:00 2 days prior to surgery). On arrival for surgery, blood samples were obtained to assess residual anti-Xa level activity and renal function. The primary outcome was residual anti-Xa level activity following the last treatment dose of enoxaparin. Incorporating all patients, linear regression modeling was performed to predict the timepoint at which the level of anti-Xa activity reliably fell below 0.2 IU/mL.

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