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Systemic gaseous microemboli during left atrial catheterization: a common occurrence?

A E Feerick1, J A Church, J Zwischenberger

  • 1Department of Anesthesiology, University of Texas Medical Branch, Galveston 77555-0591, USA.

Journal of Cardiothoracic and Vascular Anesthesia
|August 1, 1995
PubMed
Summary

Left atrial catheter insertion can cause gaseous microemboli, potentially leading to neurologic injury during cardiac surgery. Monitoring during insertion and flushing is crucial to minimize these events.

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Area of Science:

  • Cardiovascular Surgery
  • Neurology
  • Medical Device Technology

Background:

  • Gaseous microemboli (GMEs) are a concern during cardiac surgery, potentially causing neurologic injury.
  • Monitoring techniques exposing the circulation to atmospheric pressure may introduce GMEs.

Purpose of the Study:

  • To investigate the incidence of carotid artery GMEs during left atrial catheter insertion.
  • To assess the risk of cerebral microembolization associated with this procedure.

Main Methods:

  • Prospective clinical study involving 12 patients undergoing elective cardiac surgery.
  • Continuous wave Doppler probe used to monitor the left carotid artery for GMEs.
  • GMEs detected by a 30% increase in signal amplitude and characteristic sound.

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Main Results:

  • No GMEs detected before left atrial catheter insertion.
  • Statistically significant numbers of GMEs observed in 6 patients during catheter insertion (3 ± 1) and 5 patients during catheter flushing (5 ± 2).
  • A trend suggested lower filling pressures correlated with increased GME incidence during insertion (r=0.44, p=0.149).

Conclusions:

  • Left atrial catheter insertion and flushing can introduce systemic GMEs in over 50% of patients.
  • While the number of GMEs is generally small, caution is advised during catheter insertion.
  • Further research may be needed to evaluate the clinical significance of these microemboli.