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Published on: November 8, 2019
Stepwise revascularization for prevention of postoperative hyperperfusion
Tetsuyuki Yoshimoto1, Tomohide Shirasaka, Takeshi Yoshidumi
1Kashiwaba Neurosurgical Hospital, Sapporo, Hokkaido, Japan. tetsu.yoshi@kashiwaba-nougeka.or.jp
Insights
To prevent brain damage after carotid endarterectomy (CEA), a two-stage surgery gradually restores cerebral blood flow (CBF). This stepwise approach avoids dangerous hyperperfusion in high-risk patients with severe stenosis.
Area of Science:
- Neurosurgery
- Vascular Surgery
- Neurology
Background:
- Post-carotid endarterectomy (CEA) hyperperfusion can cause irreversible brain damage.
- Patients with severe carotid stenosis and poor cerebrovascular reserve are at high risk.
- The need for improved cerebral blood flow (CBF) conflicts with the risk of postoperative hyperperfusion in these patients.
Purpose of the Study:
- To present a novel surgical strategy for managing patients at high risk of hyperperfusion after CEA.
- To investigate the efficacy of stepwise restoration of CBF in preventing postoperative hyperperfusion complications.
Main Methods:
- A two-stage surgical approach was employed.
- Superficial temporal artery-middle cerebral artery (STA-MCA) anastomosis was performed first to gradually improve cerebrovascular reserve.
- Carotid endarterectomy (CEA) was performed weeks later to fully restore CBF.
Main Results:
- The surgical approach successfully prevented postoperative hyperperfusion complications in four patients.
- Good surgical outcomes were achieved without adverse events.
- Stepwise restoration of CBF demonstrated efficacy in managing high-risk patients.
Conclusions:
- A gradual, stepwise restoration of CBF via a two-stage surgical procedure is a viable strategy for preventing hyperperfusion after CEA in select high-risk patients.
- Careful preoperative evaluation using perfusion studies is crucial for identifying suitable candidates and determining the efficacy of this management approach.
Abstract:
Abrupt normalization of cerebral blood flow (CBF) after surgical procedures to improve excessive cerebral hypoperfusion can cause irreversible brain parenchymal damage. Such hyperperfusion, which is caused by inflow at normal blood pressure into maximally dilated fine vessels, is an important complication following carotid endarterectomy (CEA). Strict control of blood pressure in the perioperative period can prevent this complication except in a few patients, who have severe cerebral hypoperfusion and poor cerebrovascular reserve due to extremely severe stenosis of the ipsilateral or the bilateral carotid arteries, for which CEA is indicated. The requirement for improved CBF and the risk of postoperative hyperperfusion conflict in the pathogenesis of these patients. We tried to prevent abrupt improvement in perfusion by attempting gradual restoration of CBF. Superficial temporal artery-middle cerebral artery anastomosis was first performed to improve the poor cerebrovascular reserve by allowing insufficient blood flow. A few weeks later, CEA was performed to completely restore CBF. This surgical approach obtained good results without postoperative problems in four patients. The indications of this surgical management and efficacy of stepwise restoration of CBF to prevent postoperative hyperperfusion depend on careful preoperative evaluation of perfusion studies.
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