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Systemic Heparinization After Neuraxial Anesthesia in Vascular Surgery: A Multicenter Retrospective Analysis.

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Anesthesiologists frequently administered heparin before the recommended 1-hour interval after neuraxial anesthesia in vascular surgery patients, despite guidelines. No spinal hematomas occurred, but compliance varied significantly across institutions and procedures.

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Area of Science:

  • Anesthesiology
  • Vascular Surgery
  • Patient Safety

Background:

  • Societal guidelines recommend initiating systemic heparinization over 1 hour after neuraxial anesthesia (NA) to minimize spinal hematoma (SH) risk.
  • Adherence to these guidelines is crucial for patient safety during vascular surgeries requiring NA.

Purpose of the Study:

  • To assess anesthesiologists' adherence to heparinization guidelines after NA in Canadian tertiary hospitals.
  • To compare compliance rates across different institutions and vascular surgical procedures.
  • To evaluate the incidence of SH as a secondary outcome.

Main Methods:

  • Retrospective chart review of 877 vascular surgery patients (>18 years) undergoing specific bypass or repair surgeries under NA.
  • Data collected from Canadian academic tertiary centers between April 2012 and April 2023.
  • Analysis focused on the timing of systemic heparinization relative to NA and the occurrence of SH.

Main Results:

  • 41.2% of patients received heparin less than 60 minutes after NA, and 26.3% received it less than 45 minutes after.
  • Significant variability in guideline compliance was observed between institutions and surgical procedure types (e.g., endovascular aneurysm repair).
  • No clinically significant spinal hematomas were reported, with estimated SH risks ≤1.3% (frequentist) or ≤0.34% (Bayesian).

Conclusions:

  • Anesthesiologists frequently administered systemic heparin before the recommended 1-hour interval post-NA, indicating widespread deviation from guidelines.
  • Guideline compliance varied significantly across Canadian tertiary hospitals and was influenced by the type of vascular surgery performed.
  • Despite non-compliance, no cases of spinal hematoma were observed in the study cohort.