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Intraoperative blood flow analysis of direct revascularization procedures in patients with moyamoya disease
Marco Lee1, Raphael Guzman, Teresa Bell-Stephens
1Department of Neurosurgery and Stanford Stroke Center, Stanford University School of Medicine, Stanford, California 94305, USA.
Abstract:
Moyamoya disease is characterized by the progressive stenosis and often occlusion of the terminal internal carotid arteries, which leads to ischemic and hemorrhagic injuries. The etiology is unknown and surgical revascularization remains the mainstay treatment. We analyzed various hemodynamic factors in 292 patients with moyamoya disease, representing 496 revascularization procedures, including vessel dimension and intraoperative blood flow, using a perivascular ultrasonic flowprobe. Mean middle cerebral artery (MCA) flow rate was 4.4 ± 0.26 mL/min. After superficial temporal artery (STA)-MCA bypass surgery, flows at the microanastomosis were increased fivefold to a mean of 22.2 ± 0.8 mL/min. The MCA flows were significantly lower in the pediatric (16.2 ± 1.3 mL/min) compared with the adult (23.9 ± 1.0 mL/min; P<0.0001) population. Increased local flow rates were associated with clinical improvement. Permanent postoperative complications were low (<5%), but very high postanastomosis MCA flow was associated with postoperative stroke (31.2 ± 6.8 mL/min; P=0.045), hemorrhage (32.1 ± 10.2 mL/min; P=0.045), and transient neurologic deficits (28.6 ± 5.6 mL/min; P=0.047) compared with controls. Other flow and vessel dimension data are presented to elucidate the hemodynamic changes related to the vasculopathy and subsequent to surgical intervention.
Insights
Surgical revascularization significantly increases middle cerebral artery (MCA) blood flow in moyamoya disease patients. While higher flows correlate with improvement, excessively high flow is linked to adverse outcomes like stroke and hemorrhage.
Area of Science:
- Neurology
- Vascular Surgery
- Hemodynamics
Background:
- Moyamoya disease involves progressive stenosis of internal carotid arteries, causing ischemic and hemorrhagic injuries.
- Surgical revascularization is the primary treatment, but its hemodynamic effects require detailed analysis.
Purpose of the Study:
- To analyze hemodynamic factors, including vessel dimensions and intraoperative blood flow, in patients undergoing revascularization for moyamoya disease.
- To correlate blood flow changes with clinical outcomes and postoperative complications.
Main Methods:
- Utilized a perivascular ultrasonic flowprobe to measure vessel dimensions and intraoperative blood flow in 292 moyamoya disease patients (496 procedures).
- Compared middle cerebral artery (MCA) flow rates before and after superficial temporal artery (STA)-MCA bypass surgery.
- Analyzed flow data in pediatric versus adult populations and correlated flow rates with clinical improvement and complications.
Main Results:
- Post-STA-MCA bypass surgery, MCA flow rates increased fivefold from a mean of 4.4 mL/min to 22.2 mL/min.
- Pediatric patients exhibited significantly lower MCA flows (16.2 mL/min) compared to adults (23.9 mL/min).
- Increased local flow rates correlated with clinical improvement, but very high MCA flow (>28 mL/min) was associated with increased risk of stroke, hemorrhage, and transient neurologic deficits.
Conclusions:
- Superficial temporal artery-middle cerebral artery bypass effectively augments cerebral blood flow in moyamoya disease.
- Hemodynamic monitoring is crucial, as excessively high postoperative flow may predict adverse neurological events.
- Understanding these hemodynamic changes is vital for optimizing surgical strategies and patient management in moyamoya disease.
