How many hours should elapse before performing a single-shot spinal anesthetic in a patient receiving enoxaparin 1 mg/kg twice daily for deep vein thrombosis?

How many hours should elapse before performing a single-shot spinal anesthetic in a patient receiving enoxaparin 1 mg/kg twice daily for deep vein thrombosis?

• A. 2 hours
• B. 6 hours
• C. 12 hours
• D. 24 hours

Answer: (D)

Neuraxial anesthesia must be timed with anticoagulation to avoid spinal hematoma. When enoxaparin is given at a therapeutic dose (1 mg/kg twice daily), there is significant anticoagulant effect that can persist and elevate bleeding risk in the spinal canal. To minimize this risk, a 24-hour interval after the most recent enoxaparin dose is recommended before performing a spinal block. Shorter intervals (2, 6, or 12 hours) would leave substantial anticoagulant activity and are not considered safe in this setting.

Neuraxial anesthesia must be timed with anticoagulation to avoid spinal hematoma. When enoxaparin is given at a therapeutic dose (1 mg/kg twice daily), there is significant anticoagulant effect that can persist and elevate bleeding risk in the spinal canal. To minimize this risk, a 24-hour interval after the most recent enoxaparin dose is recommended before performing a spinal block. Shorter intervals (2, 6, or 12 hours) would leave substantial anticoagulant activity and are not considered safe in this setting.