Hydrogel Endovascular Aneurysm Treatment Trial (HEAT)
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|ClinicalTrials.gov Identifier: NCT01407952|
Recruitment Status : Completed
First Posted : August 2, 2011
Results First Posted : June 27, 2019
Last Update Posted : June 27, 2019
This research study is being done to test the effectiveness of a new generation FDA approved device for treating aneurysms compared to the current standard device for endovascular aneurysm treatment which is bare platinum coils. Endovascular procedures are a form of minimally invasive surgery, which is performed on blood vessels. The technique involves the introduction of a catheter which is a long, thin, flexible, hollow plastic tube through the skin into a large blood vessel. Typically the chosen blood vessel is the femoral artery found near the groin. The catheter is then maneuvered through the body to the location of the aneurysm in the brain using image guidance. Coils are delivered into the aneurysm through the catheters. Once the coils are delivered in the aneurysm, they are detached from the catheter. This is repeated until enough coils fill the aneurysm, blocking the blood flow to the aneurysm. The body responds by forming blood clots around the coil(s), which helps block the flow of blood into the aneurysm and keeps the vessel from rupturing or leaking. This study will compare the study device to the standard bare platinum coil to see which is better at preventing future rupturing or leaking. The study device is called the HydroCoil Embolization System and this study is a post-market clinical trial.
About 600 subjects from multiple institutions will take part in this study.
|Condition or disease||Intervention/treatment||Phase|
|Cerebral Aneurysm||Device: HydroCoil Embolic System Device: Control (bare platinum coils)||Not Applicable|
Your part in this study will last up to 24 months and will involve 6 visits (1 baseline visit before your surgery, the surgical procedure and 4 follow-up visits). These visits will occur at the same time as the visits you would receive as standard of care after your surgery.
If you are in this study, you will be placed in one of two study groups by chance using a process similar to the flip of a coin. This process is called randomization. Neither you nor the study staff will select the group you will be in. One group, the control group, will have their aneurysm treated by the bare platinum coils during their endovascular procedure. The other group, the study group will receive coils from the HydroCoil Embolization System. Both groups will receive the same standard of care and follow-up, but during the surgery different types of coils will be used.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||600 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||None (Open Label)|
|Official Title:||New Generation Hydrogel Endovascular Aneurysm Treatment Trial|
|Study Start Date :||April 2012|
|Actual Primary Completion Date :||March 2018|
|Actual Study Completion Date :||March 2018|
HydroCoil Embolic System
Aneurysm treatment using the HydroCoil Embolization System (21 CFR 882.5950)
Device: HydroCoil Embolic System
HydroCoil Embolic System
Other Name: MicroVention, Inc
Aneurysm treatment using bare platinum coil(s)
Device: Control (bare platinum coils)
bare platinum coils
- Number of Patients With Aneurysm Recurrence Post Surgery [ Time Frame: post surgery to 24 months ]Defined as any progression on the Raymond-Roy (RR) Aneurysm Occlusion Scale. The RR scale is such that 1=complete occlusion, 2=residual neck, and 3=residual aneurysm.
- Packing Density [ Time Frame: at operation ]Packing density as measured by volumetric filling of the aneurysm
- Clinical Outcome: Modified Rankin Scale (mRS) [ Time Frame: 24 months ]modified rankin scale is a measure of neurological disability, which ranges from 0=no symptoms to 5=severe disability (6=dead).
- Number of Participants With Adverse Events Related to the Procedure and/or the Device by Participant at Any Time in the Study. [ Time Frame: 24 months ]number of participants who experienced any peri-procedural or post-procedural Adverse Event noted to be related to the procedure or device.
- Total Number of Peri-procedural and Post-procedural Adverse Events Related to the Procedure and/or the Device. [ Time Frame: 24 months ]total number of Adverse Events per person that were noted to be related to the procedure and device during the study
- Number of Patients Who Expired During the Study (Mortality Rate) [ Time Frame: 24 months ]all-cause mortality at any time during study follow-up
- Number of Participants With Initial Complete Occlusion [ Time Frame: at procedure ]Raymond-Roy (RR) Scale=1 at procedure The RR scale is such that 1=complete occlusion, 2=residual neck, and 3=residual aneurysm.
- Number of Patients Who Needed Re-treatment of Target Aneurysm [ Time Frame: 24 months ]During the 24 month follow-up, if Aneurysm needed to be re-treated.
- Number of Participants Experiencing a Hemorrhage From Target Aneurysm Post Surgery [ Time Frame: 24 months ]Per the Adverse event log, if a hemorrhage or rupture occurred that was noted to be related to the procedure or device at any point during the 24 month follow-up (not during the operation).
- Number of Participants Who Progressed on the Meyers Scale [ Time Frame: 24 months ]Occlusion (in)stability was determined by progression on the Meyers scale. The Meyer scale is a 6-point grading scale based on the percentage of the aneurysm filled by contrast on DSA. Grade zero indicates complete and total aneurysm occlusion without remnant or in-terstitial filling within the aneurysm. Grade 1 represents greater than 90%volumetric occlusion of the aneurysm based on planar imaging assessment; grade 2, 70%-89% aneurysm occlusion; grade 3,50%-69%; grade 4, 25%-49%; and grade 5, less than 25% volumetric aneurysm occlusion.
- Number of Participants Experiencing Major Versus Minor Recurrence by 24 Months Follow-up. [ Time Frame: 24 months ]
Major recurrence is defined as progression on the Raymond-Roy (RR) Scale to 3, or if initial RR was 3, then progression on the Meyers scale. Minor recurrence was defined as a progression on the RR scale to 2.
The RR scale is a 3 point measure of occlusion, 1=total, 2=residual neck, and 3=residual aneurysm.
The Meyer scale is a 6-point grading scale based on the percentageof the aneurysm filled by contrast on DSA. Grade zero indicates complete and total aneurysm occlusion without remnant or in-terstitial filling within the aneurysm. Grade 1 represents >90%volumetric occlusion of the aneurysm based on planar imaging assessment; grade 2, 70%-89% aneurysm occlusion; grade 3,50%-69%; grade 4, 25%-49%; and grade 5, <25% volumetric aneurysm occlusion.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01407952
|Principal Investigator:||Bernard R Bendok, MD||Mayo Clinic|