Factors predictive of cerebral hyperperfusion after carotid angioplasty and stent placement
Yasuhiko Kaku1, Shin-ichi Yoshimura, Jouji Kokuzawa
1Department of Neurosurgery, Asahi University Murakami Memorial Hospital, Japan.
Insights
Patient age, cerebral vasoreactivity (CVR), and asymmetry index predict cerebral hyperperfusion after carotid stenting. These factors can help identify patients at risk for this complication.
Area of Science:
- Neurology
- Radiology
- Vascular Surgery
Background:
- Cerebral hyperperfusion syndrome is an emerging complication following carotid angioplasty and stent placement.
- Identifying predictors is crucial for patient management and risk stratification.
Purpose of the Study:
- To determine significant predictors of the hyperperfusion phenomenon after carotid angioplasty and stent placement.
- To enhance the understanding of risk factors associated with post-procedural cerebral hemodynamics.
Main Methods:
- Retrospective review of 30 patients with severe carotid stenosis undergoing angioplasty and stenting.
- Quantitative measurement of resting cerebral blood flow (CBF) and cerebral vasoreactivity (CVR) using acetazolamide challenge.
- Single photon emission computed tomography (SPECT) imaging ([123I] iodoamphetamine and Tc-99m HMPAO) performed pre- and post-procedure.
Main Results:
- Three patients (10%) exhibited cerebral hyperperfusion phenomenon post-procedure, with one developing status epilepticus.
- Significant predictors identified were patient age, pretreatment CVR, and pretreatment asymmetry index.
- Pretreatment resting CBF, degree of stenosis, and symptom interval were not significant risk factors.
Conclusions:
- Patient age, pretreatment CVR, and asymmetry index are significant predictors of post-carotid stenting hyperperfusion.
- Pretreatment CBF measurements and immediate post-procedure SPECT may aid in identifying at-risk patients.
- Early identification allows for targeted monitoring and blood pressure management to prevent hyperperfusion syndrome.
Background And Purpose:
Cerebral hyperperfusion syndrome has been increasingly reported as a complication of carotid angioplasty and stent placement. The aim of the present study was to determine significant predictors of hyperperfusion phenomenon after carotid angioplasty and stent placement.
Methods:
We retrospectively reviewed 30 consecutive patients with unilateral severe carotid stenosis who underwent angioplasty and stent placement. Resting cerebral blood flow (CBF) and cerebral vasoreactivity (CVR) to acetazolamide challenge were quantitatively measured to evaluate cerebral hemodynamic reserve. Split-dose [(123)I] iodoamphetamine single photon emission CT (SPECT) was performed before and 7 days after carotid angioplasty and stent placement. Technetium-99m hexamethylpropyleneamine oxime (HMPAO) SPECT was performed immediately after the procedure.
Results:
Three patients had cerebral hyperperfusion phenomenon immediately after angioplasty and stent placement, as shown by HMPAO SPECT: One developed status epilepticus 2 weeks after the procedure. Significant predictors of hyperperfusion included patient age, pretreatment CVR, and pretreatment asymmetry index ([ipsilateral resting CBF/contralateral resting CBF] x 100). Variables determined not to be significant risk factors included pretreatment resting CBF value, degree of carotid stenosis, and interval from the onset of ischemic symptoms.
Conclusion:
Significant predictors of hyperperfusion phenomenon after carotid angioplasty and stent placement included patient age, pretreatment CVR, and pretreatment asymmetry index. Pretreatment CBF measurements, including those obtained by quantifying CVR and performing SPECT immediately after the procedure may aid in identifying patients at risk and in initiating careful monitoring and control of blood pressure to prevent hyperperfusion syndrome.
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