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Cerebral Oximetry Decrease After External Carotid Clamping with Normal Electroencephalography and No Change After

Rotem Naftalovich1, Enrique J Pantin, John T Denny

  • 1From the Rutgers Robert Wood Johnson Medical School, Rutgers University, New Brunswick, New Jersey; and Saint Barnabas Medical Center, Livingston, New Jersey.

A & a Case Reports
|December 15, 2015
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Summary
This summary is machine-generated.

Near-infrared spectroscopy monitors cerebral perfusion by estimating regional cerebral oxygen saturation (rSO2). This case shows external carotid clamping significantly impacts rSO2, not just internal carotid flow.

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Area of Science:

  • Neurology
  • Medical Devices
  • Surgical Monitoring

Background:

  • Near-infrared spectroscopy (NIRS) is used to monitor cerebral perfusion.
  • Regional cerebral oxygen saturation (rSO2) is a key metric estimated by NIRS.

Observation:

  • During carotid endarterectomy, left external carotid artery clamping caused an immediate 8% drop in left rSO2.
  • This decrease occurred despite no observed electroencephalogram changes.

Findings:

  • Cerebral oximetry values (rSO2) are influenced by both internal and external carotid artery blood flow.
  • The external carotid artery plays a significant role in maintaining cerebral oxygenation detectable by NIRS.

Implications:

  • NIRS monitoring during carotid surgery should consider the contribution of external carotid blood flow.
  • Understanding these influences can refine the interpretation of rSO2 during neurosurgical procedures.