Hypotensive anesthesia and autotransfusion in spinal surgery

Area of Science:

• Anesthesiology
• Neurosurgery
• Orthopedic Surgery

Background:

• Spinal surgeries often involve significant blood loss, necessitating transfusions.
• Managing intraoperative bleeding is crucial for patient outcomes.

Purpose of the Study:

• To compare blood loss and transfusion requirements between normotensive and controlled hypotensive anesthesia during spinal operations.
• To evaluate the efficacy of moderate blood pressure reduction in minimizing surgical bleeding.

Main Methods:

• Retrospective comparison of 68 spinal surgeries under normotensive anesthesia versus 77 under controlled hypotensive anesthesia.
• Procedures included Harrington instrumentation, fusion, laminectomies, and other spinal fusions.
• Controlled hypotension was achieved with a moderate systolic blood pressure reduction (approx. 20 mm Hg), coupled with hemodilution (hematocrit 28-30%) and autotransfusion.

Main Results:

• Controlled hypotensive anesthesia reduced intraoperative and postoperative blood loss by approximately 50% compared to normotensive anesthesia.
• A moderate systolic blood pressure reduction of 20 mm Hg was effective; greater reductions did not yield further significant blood loss reduction.
• The combination of hypotension, hemodilution, and autotransfusion substantially decreased the need for homologous blood transfusions.

Conclusions:

• Controlled hypotensive anesthesia is an effective technique for reducing blood loss during spinal surgery.
• Combining deliberate hypotension with hemodilution and autotransfusion can virtually eliminate the need for homologous blood transfusions in most spinal procedures.
• This approach enhances patient safety and resource management in spinal surgery.