Doppler Flow Wires in Cerebral Angiography

Study Overview
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Brief Summary
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The purpose of this study is to use a wire with a Doppler tip to measure blood flow in vessels in the brain and determine hemodynamic factors associated with treatment success or failure. Many neurological diseases cause abnormal blood flow in the brain in specific vessels. The special wire used in this study is place into brain blood vessels during standard of care procedure to treat such diseases, and blood flow parameters (such as velocity and pressure) are measured to gain better understanding of these neurological diseases.

Detailed Description
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Current treatments of cerebral aneurysms are imperfect, and aneurysmal hemodynamics is an important factor in treatment failure. The identification of hemodynamic factors that influence treatment success could predict outcome. Published studies show that the hemodynamic environment of aneurysms changes after treatment, and there is limited retrospective evidence that the degree of change affects treatment success. However, previous hemodynamic calculations did not have access to patient-specific measurements of blood flow, which substantially reduced their accuracy. In addition, no prospective studies of the predictive value of post-treatment aneurysm hemodynamics have been done. Methods: Prospectively test new aneurysm patients for hemodynamic predictors of treatment outcome based upon the hypothesis long-term aneurysm treatment outcome can be prospectively predicted by measuring the immediate hemodynamic effects of aneurysm treatment with novel patient-specific modeling techniques. Task 1: In a new cohort of patients undergoing aneurysm treatment, the investigators will again use Doppler guidewire measurements to create patient-specific hemodynamic models of treatment effects. By prospectively applying the knowledge of crucial hemodynamic changes the investigators will use immediate post-treatment hemodynamics to predict long-term treatment outcome.

Official Title
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Predicting Cerebral Aneurysm Recurrence Using Doppler Guidewire Measurements

Conditions
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Aneurysm, Cerebral Aneurysm

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patient with an unruptured intracranial aneurysm ≥ 5mm in size undergoes endovascular treatment and subsequent angiographic follow-up Exclusion Criteria: -previously enrolled in the study

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Treatment Prediction | The results of this prospective aim have the potential to substantially influence aneurysm management by predicting long-term outcome at the time of initial treatment. The investigators will determine how well the prospective test predicts long-term treatment success as applied at the time of treatment, using computational fluid dynamics modeling of hemodynamic factors with the incorporation of patient-specific measurements obtained by the Doppler guidewire | May 2017- July 2019 |