Diagnosis and monitoring of cerebral hyperperfusion after carotid endarterectomy with single photon emission computed tomography: Case report

Christopher J. Baker, Stephan A. Mayer, Charles J. Prestigiacomo, Ronald L. Van Heertum, Robert A. Solomon

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

OBJECTIVE AND IMPORTANCE: Focal neurological deficits after carotid end- arterectomy may result from ischemia or hyperperfusion. The usefulness of single photon emission computed tomography (SPECT) for differentiating between these two mechanisms has not been previously emphasized. CLINICAL PRESENTATION: An 83-year-old man experienced dysarthria and left-sided weakness immediately after undergoing endarterectomy of the right internal carotid artery. The results of computed tomography of the head were normal, and transcranial Doppler sonography showed symmetrically elevated velocities in both middle cerebral arteries. On the 1st postoperative day, the patient's deficits worsened in parallel with spontaneous increases in blood pressure, and blood pressure reduction with labetalol resulted in clinical improvement. INTERVENTION: On the 2nd postoperative day, technetium-99-hexametazime SPECT demonstrated markedly increased flow in the right basal ganglia and inferior frontal cortex, confirming the diagnosis of cerebral hyperperfusion. The patient's deficits continued to improve with antihypertensive therapy, and SPECT performed 7 and 48 days after surgery showed gradual normalization of the focal hyperemia. CONCLUSION: SPECT can be used to diagnose and monitor cerebral hyperperfusion after carotid endarterectomy and may be of particular value for differentiating hyperperfusion from ischemia when characteristic computed tomographic and transcranial Doppler sonographic findings are absent.

Original languageEnglish
Pages (from-to)157-161
Number of pages5
JournalNeurosurgery
Volume43
Issue number1
DOIs
StatePublished - Jul 1998
Externally publishedYes

Keywords

  • Carotid endarterectomy
  • Computed tomography
  • Hyperperfusion
  • Single photon emission
  • Transcranial Doppoler
  • Ultrasonography

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