AneurysmFlow R1.0 is an approved (i.e. CE labeled, 510k, Health Canada), software tool intended to provide relevant information on the blood flow in a cerebral aneurysm and its parent artery based on angiography. It calculates the Mean Aneurysm Flow Amplitude (MAFA) ratio to measure the volumetric flow rate quotient before and after Flow Diverter Stent (FDS) implantation in the region of interest. The current study is a prospective, single arm, observational, multicenter cohort study to assess the prognostic value of the MAFA ratio for predicting full aneurysm occlusion 12 months after flow diverter placement.
AneurysmFlow R1.0 is an approved (CE labeled, cleared in US, Canada and Argentina), software tool intended to provide relevant information on the blood flow in a cerebral aneurysm and its parent artery based on angiography. It provides color coded and vector field representation of a digital subtraction angiography (DSA). It can quantify blood flow rates in the artery based on DSA and 3-D Rotational Angiogram (3DRA) data. It can visualize blood flow patterns in an aneurysm based on DSA data. Specifically, it calculates the Mean Aneurysm Flow Amplitude (MAFA) ratio to measure the volumetric flow rate quotient before and after Flow Diverter Stent (FDS) implantation in the region of interest. It is manufactured by Philips Medical Systems bv., a Philips Healthcare company. 120 subjects with unruptured, \>5mm saccular aneurysm(s) located in the anterior intracranial circulation and suitable for an endovascular treatment with a Flow Diverter Stent will be enrolled in the study. The enrollment period is expected to last for 1 year. Physician investigators participating in this study are expected to follow their normal clinical practice in enrolling, treating and following patients with intracranial aneurysms that are amenable to treatment with flow diverter stents. No additional procedures are required of patients in order to participate in this observational study. Pre-Screening Patients presenting with intracranial saccular aneurysm(s) will be evaluated by the neuro interventional team, in accordance with institutional practice, to establish an appropriate treatment plan based on the patient's medical condition and available diagnostic screening procedures prior to recruitment in the study. More than one aneurysm in a single patient may be treated, but only one target aneurysm treated with an FDS device will be considered as part of this study. If treatment of the aneurysm with the FDS is deemed appropriate, the institution's guidelines regarding their ethics committee and informed consent process will be followed. Screening After obtaining the consent form(s) approved by the local research ethics board (REB), the principal investigator will screen the potential investigation subjects for the CARO study. The principal investigator or his delegates on the study team will enter data in a pre-designed digital Case Report Form (e-CRF). This will include patient demographics, relevant past medical and surgical history, and specific target aneurysm data along with pre-procedural/screening imaging details. Only patients who meet all inclusion and none of the exclusion criteria will qualify for this study. The measurement and size of each aneurysm will be verified by the principal investigator. If the size of the aneurysm is acceptable, then it will be included in the study. It is recommended that this measurement should be done within 180 days before the procedure. Index Procedure and Discharge The investigator will proceed with standard of care procedures on the day of Index Procedure (i.e. FDS insertion) for the target aneurysm(s). Then, endovascular treatment procedure details should be provided for each eligible patient. Blood flow velocity will be calculated using the dedicated software AneurysmFlow (Philips Healthcare, Best, The Netherlands), which will be installed on standard of care imaging equipment. For this purpose, digital subtraction angiograms will be acquired during the procedure; just before and right after placement of the FDS. Calculation of blood flow velocity will be performed automatically on the AneurysmFlow software. There are no additional devices or medications required for the study. The AneurysmFlow software uses standard-of-care 2D DSA and 3D-RA image sequences to determine this flow information. All raw image sequences will be stored for future reference. This study will not make any recommendation on patient management or on treatment strategy. Also, this software will not disrupt standard-of-care workflow for the interventionalist. Follow-Ups (6 and 12 months) All registry patients treated with FDS are expected to follow their routine post treatment clinical visits, which will include a standard-of-care head imaging (e.g. Computed Tomography Angiography (CTA), Magnetic Resonance Angiography (MRA) and/or DSA) test to classify aneurysm occlusion (i.e. Raymond-Roy Occlusion Classification I) at 6 months (±49 days) and 12 months (±49 days). During the 6 and 12 month follow up visits, patient medical charts will be accessed to collect adverse events (if applicable) and document any post-treatment neurological deterioration (neurological assessment, modified Rankin Scale). De-identified data (i.e. clinical notes, imaging reports etc.) will be entered in the relevant e-CRF sections. All (serious) adverse events (i.e. re-operations, ruptures and deaths) whether or not related to the investigational device will be collected and reported conform local rules and regulations. The total duration of the study is expected to take approximately 2.5 years. Patient enrollment will take place between September 2018 and September 2019. Each subject will be in the study for 1 year (follow-up).
Study Type
OBSERVATIONAL
Enrollment
132
AneurysmFlow R1.0 is an approved (CE labeled, cleared in US, Canada and Argentina), software tool intended to provide relevant information on the blood flow in a cerebral aneurysm and its parent artery based on angiography. It provides color coded and vector field representation of a digital subtraction angiography (DSA). It can quantify blood flow rates in the artery based on DSA and 3-D Rotational Angiogram (3DRA) data. It can visualize blood flow patterns in an aneurysm based on DSA data. Specifically, it calculates the Mean Aneurysm Flow Amplitude (MAFA) ratio to measure the volumetric flow rate quotient before and after Flow Diverter Stent (FDS) implantation in the region of interest. It is manufactured by Philips Medical Systems B.V., a Philips Healthcare company.
Baptist Health
Jacksonville, Florida, United States
UMass Medical Center
Worcester, Massachusetts, United States
ENERI
Buenos Aires, Argentina
Toronto Western Hospital
Toronto, Ontario, Canada
Prognostic Value of the MAFA (Mean Aneurysm Flow Amplitude) Ratio With Respect to Full Aneurysm Occlusion Within 12 Months
To assess the prognostic value (i.e. c-statistic including confidence intervals) of the MAFA ratio with respect to full aneurysm occlusion (i.e. using the Raymond-Roy Occlusion Classification I on standard-of-care head imaging) 12 months after Flow Diverter Stent placement. The objective was evaluated using logistic regression analysis to evaluate the univariate predictive association between the index test (i.e., the MAFA ratio) and complete aneurysm occlusion (i.e., complete occlusion yes/no) at 12 months. The primary endpoint was presented using a Receiver Operating Characteristic (ROC) curve including the c-statistic (also known as the Area Under the Curve (AUC) of the ROC curve) and confidence intervals.
Time frame: 12 months
Prognostic Value of the MAFA Ratio With Respect to Full Aneurysm Occlusion Within 6 Months
To assess the prognostic value (i.e. c-statistic including confidence intervals) of the MAFA ratio with respect to full aneurysm occlusion (i.e. using the Raymond-Roy Occlusion Classification I on standard-of-care head imaging) 6 months after Flow Diverter Stent placement. The objective was evaluated using logistic regression analysis to evaluate the univariate predictive association between the index test (i.e., the MAFA ratio) and complete aneurysm occlusion (i.e., complete occlusion yes/no) at 12 months. The endpoint was presented using a Receiver Operating Characteristic (ROC) curve including the c-statistic (also known as the Area Under the Curve (AUC) of the ROC curve) and confidence intervals.
Time frame: 6 months
Optimal MAFA Threshold
To determine the optimal threshold for the MAFA ratio (to predict full aneurysm occlusion within 12 months), ROC analysis will be performed in combination with net-benefit analysis. Net benefit incorporates estimates of prevalence and misclassification costs, and it is clinically interpretable since it reflects changes in correct and incorrect diagnoses when a new diagnostic test is introduced. The optimal MAFA ratio threshold for clinical decision making is defined as the MAFA ratio where the net benefit is maximized. MAFA (Mean Aneurysm Flow Amplitude) = (mean aneurysm flow post / mean aneurysm flow pre) \* (mean arterial flow pre / mean arterial flow post)
Time frame: 12 months
Serious Adverse Events
To register serious adverse events (i.e. re-operations, ruptures and deaths).
Time frame: 12 months
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.