BOSTON – The use of an intravascular ultrasound (IVUS)–based scoring system could predict stent failure at 2 years in the treatment of May-Thurner syndrome, according to Steven D. Abramowitz, MD, of the MedStar Washington Hospital Center, Washington, and his colleagues.
Dr. Abramowitz presented their research in the Vascular and Endovascular Society (VESS) sessions held at the Vascular Annual Meeting.
“IVUS has become an important adjuvant diagnostic tool in the treatment of deep venous disease, and as such may provide a useful assessment and predictive tool for treatment success in stenting of May-Thurner syndrome,” said Dr. Abramowitz.
In their study, 118 consecutive patients with May-Thurner syndrome underwent IVUS-guided stent placement from April 2009 through May 2015 at two collaborating institutions. Patients had a mean age of 46 years and included 86 (73%) women. At the time of treatment, 45, 30, 25, and 18 patients had Clinical Etiology Anatomy Pathophysiology disease 3, 4, 5, and 6, respectively.
Dr. Abramowitz described how he and his colleagues derived an IVUS-driven scoring system to assess the following categories of May-Thurner syndrome (nonocclusive or occlusive), disease chronicity (nonthrombotic, acute, or chronic), venous disease length (less than 180 mm or greater than 181 mm), venous inflow compliance (presence or absence of respiratory variation), iliocaval confluence disease involvement (present or absent), iliocaval con-fluence stenting obligation (stented or spared), and presence of perivenous collaterals before and after stenting (none or resolved).
Six of the categories were scored with 0 or 1 and one category was scored with 0, 1, or 2. Scores were tabulated for each patient at the time of initial intervention.
All 118 (100%) patients received anticoagulation and 78 (66%) were on an antiplatelet agent. Thirty-eight (32%) developed moderate in-stent stenosis, required thrombolysis, or underwent additional stenting procedures and were considered treatment failures during the observed period.
Eighty patients (68%) required no additional intervention and were considered treatment successes. The mean IVUS score for all patients was 5.22. The mean IVUS score in the treatment failure cohort was 5.64 compared with a score of 4.67 in the treatment success group, a significant difference. Patients with a score above 4 on this 7-point scale had an increased relative risk (1.6) of stent failure at 2 years.
“An IVUS-driven scoring system score of 4 or greater during initial intervention for May-Thurner syndrome predicts failure at 2 years. Additional treatment modalities should be considered at implantation to prevent failure,” said Dr. Abramowitz.
In an interview, Dr. Abramowitz added: “There is an emerging body of research regarding outcomes of deep venous intervention. However, we are still looking to generate clinically relevant data that will help guide interventionists to achieve durable technical success and long-term positive clinical outcomes for our patients.
“At this time, there is very little data to help correlate what physicians see on venography and IVUS during the treatment of May-Thurner Lesions. This data is hopefully the first step in allowing us to guide intra-operative decision making. IVUS is an excellent tool that has been proven by other studies to aid in the diagnosis and management of venous disease. With this data we also hope that it becomes a drive of patient management as well. Ideally, this data will transition into also guiding anticoagulation management, postoperative surveillance strategies and outcomes stratification for patients,” Dr. Abramowitz concluded.