Paraplegia Prevention in Aortic Aneurysm Repair by Thoracoabdominal Staging (PAPA-ARTiS)
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|ClinicalTrials.gov Identifier: NCT03434314|
Recruitment Status : Recruiting
First Posted : February 15, 2018
Last Update Posted : September 3, 2019
Aortic aneurysms represent the most common and dangerous aortic diseases. Although conventional aortic repair techniques cure the disease, there is a high risk of paraplegia particularly in extensive thoracoabdominal aneurysms due to impaired blood supply to the spinal cord.
The PAPA-ARTiS trial will assess the clinical safety and efficacy of the MISACE (Minimally-Invasive Segmental Artery Coil-Embolization) procedure, a novel therapeutic concept to reduce the risk of paraplegia due to aneurysm repair.
The study investigates the MISACE procedure as a potential pre-treatment prior to open or endovascular aneurysm repair in patients with thoracoabdominal aortic aneurysms. Patients will be randomized to one of the two treatment strategies: a) aneurysm repair without MISACE pre-treatment, or b) aneurysm repair with MISACE pre-treatment.
|Condition or disease||Intervention/treatment||Phase|
|Aortic Aneurysm, Thoracoabdominal||Procedure: Minimally-Invasive Segmental Artery Coil-Embolization||Not Applicable|
Chronic aortic aneurysms are permanent and localized dilations of the aorta that remain asymptomatic for long periods of time, but continue to increase in diameter before they eventually rupture. Left untreated, the patients' prognosis is dismal, since the internal bleeding of the rupture brings about sudden death. Although successful treatment cures the disease, the risky procedures compromise spinal cord blood supply acutely and permanently, frequently leading to paraplegia, particularly for aneurysms involving crucial segmental arteries, i.e. thoracoabdominal aortic aneurysms of Crawford type II & III. Although various strategies have achieved a remarkable decrease in the incidence of paraplegia, it is still no less than 10-20%.
However, it has recently been found that the deliberate staged occlusion of the segmental arteries to the paraspinous collateral network finally supplying the spinal cord can trigger arterial collateralization, thus stabilizing blood supply from alternate inflow sources and preventing ischaemia.
This has been translated to a clinically available therapeutic option, 'minimally invasive staged segmental artery coil embolization' (MISACE), which proceeds in a 'staged' manner to occlude groups of arteries under highly controlled conditions, after which time must be allowed for arteriogenesis to build a robust collateral blood supply.
PAPA-ARTiS is a multi-national, prospective, open-label, two-arm, randomized controlled trial to demonstrate, that a minimally invasive staged treatment approach can reduce paraplegia and mortality in patients undergoing thoracoabdominal aortic aneurysm (TAAA) repair.
Patients with planned aneurysm repair will be included in the study and will be randomized 1:1 in the control group or the MISACE-group. The control group receives treatment as per standard institutional protocol - open or endovascular repair without MISACE. In the MISACE-group, segmental arteries will be occluded in one to three sessions some weeks before the definite repair. Segmental arteries are occluded with coils or plugs.This induces arteriogenesis and the building of a robust collateral network ultimately supplying the spinal cord. During aneurysm repair, these new arteries provide an alternate blood supply to the spinal cord and thereby help prevent paraplegia.
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||500 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||None (Open Label)|
|Official Title:||Paraplegia Prevention in Aortic Aneurysm Repair by Thoracoabdominal Staging With 'Minimally-Invasive Segmental Artery Coil-Embolization': A Randomized Controlled Multicentre Trial - PAPA-ARTiS|
|Actual Study Start Date :||November 8, 2018|
|Estimated Primary Completion Date :||October 2020|
|Estimated Study Completion Date :||September 2021|
Experimental: MISACE arm
Minimally-Invasive Segmental Artery Coil-Embolization
MISACE procedure prior to aneurysm repair
segmental arteries are occluded with coils or plugs in one to three MISACE sessions (staged procedure)
Procedure: Minimally-Invasive Segmental Artery Coil-Embolization
During one single MISACE session 3-7 segmental arteries will be occluded. The procedure is conducted through a peripheral artery access in local anaesthesia. Microcoils or vascular plugs will be used for the occlusion itself.
No Intervention: control arm
receives treatment of aneurysm as usual: open surgical repair or endovascular repair without MISACE
- The primary objective is to greatly reduce incidence of ischaemic spinal cord injury and mortality. [ Time Frame: 30 days after TAAA repair ]
Successful treatment of the aneurysm is a binary variable. All of the following criteria must be met for this composite endpoint to count as a success:
- The patient is alive and without substantial spinal cord injury 30 days after treatment, and
- the aneurysm did not rupture and has been excluded within six months of randomization. Substantial spinal cord injury will be determined with a modified Tarlov scale (see below).
- substantial spinal cord injury [ Time Frame: 30 days after TAAA repair and at one year after TAAA repair ]
Substantial spinal cord injury is defined as zero to two on the modified Tarlov scale.
0. No lower extremity movement
- Lower extremity motion without gravity
- Lower extremity motion against gravity
- Able to stand with assistance
- Able to walk with assistance
- spinal cord injury according to the modified Tarlov scale from TAAA repair to one year [ Time Frame: from date of TAAA repair and up to one year after TAAA repair ]Spinal cord injury will be determined with a modified Tarlov scale (see above).
- mortality [ Time Frame: at 30 days and one year after TAAA repair ]all-cause mortality
- stay in intensive care unit and intermediate care [ Time Frame: from date of TAAA repair and up to one year after TAAA repair ]length of stay in intensive care unit and intermediate care unit after TAAA repair
- sub-group analyses [ Time Frame: up to one year after TAAA repair ]sub-group analyses of spinal cord injury according to modified Tarlov scale (see above) for open repair and endovascular repair separately
- sub-group analyses [ Time Frame: up to one year after TAAA repair ]sub-group analyses of mortality for open repair and endovascular repair separately
- re-operation for bleeding [ Time Frame: from date of TAAA repair and up to one year after TAAA repair ]re-operation for bleeding (only for open repair)
- cross-clamping times [ Time Frame: during open surgery ]cross-clamping times during open surgery
- residual aneurysm sac perfusion [ Time Frame: up to one year after TAAA repair ]residual aneurysm sac perfusion, i.e. type II endoleaks (only for endovascular repair)
- costs [ Time Frame: up to one year after TAAA repair ]incremental cost-effectiveness ratio (ICER) will be calculated
- Quality Adjusted Life Years [ Time Frame: up to one year after TAAA repair ]Quality Adjusted Life Years (QALYs) will be estimated over one year
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03434314
|Contact: Christian D Etz, Prof. Dr.||+49 341 865 email@example.com|
|Contact: David Petroff, Dr.||+49 341 97 16 firstname.lastname@example.org|
|Principal Investigator:||Christian D Etz, Prof. Dr.||University Leipzig|