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Aortic arch replacement with proximal first technique.

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Summary

This study modified aortic arch repair to shorten deep hypothermic circulatory arrest (DHCA) times. While successful, DHCA duration remained the key factor for temporary neurological dysfunction, suggesting continuous cerebral perfusion is safer.

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Area of Science:

  • Cardiovascular Surgery
  • Neurosurgery
  • Anesthesiology

Background:

  • Deep hypothermic circulatory arrest (DHCA) without retrograde cerebral perfusion (RCP) has critical time limitations.
  • A modified surgical technique was developed to reduce DHCA duration and unilateral cerebral perfusion (UCP) time.
  • This study aimed to evaluate the safety and efficacy of the modified technique in aortic arch repair.

Purpose of the Study:

  • To shorten the duration of deep hypothermic circulatory arrest (DHCA) during aortic arch replacement.
  • To evaluate the impact of a modified surgical technique on cerebral perfusion and neurological outcomes.
  • To compare outcomes between DHCA and unilateral cerebral perfusion (UCP) groups in aortic arch surgery.

Main Methods:

  • Retrospective analysis of 23 patients undergoing aortic arch replacement with branches (March 1993-August 2001).
  • Patients were divided into DHCA (n=9) and UCP (n=14) groups.
  • The modified technique involved performing proximal anastomosis first, followed by branch reconstruction during circulatory arrest, and then resuming perfusion.

Main Results:

  • Mean DHCA time was 18.8 minutes; mean UCP time was 11.0 minutes.
  • Overall survival was 91.3% (21/23 patients).
  • Transient neurological dysfunction was significantly associated with DHCA duration, occurring in 4 patients in the DHCA group.

Conclusions:

  • The modified technique successfully reduced DHCA and UCP times in aortic arch repair.
  • DHCA duration was the sole significant predictor of temporary neurological dysfunction.
  • Continuous cerebral perfusion during deep hypothermia may offer superior cerebral protection.