RICSICAS is a prospective, randomized, single-center trial designed to evaluate whether chronic remote ischemic conditioning (RIC) reduces major vascular events in high-risk symptomatic carotid artery stenosis patients undergoing carotid artery stenting (CAS).
Key Findings
Methods
The RICSICAS trial uses a PROBE (prospective, randomized, open-label, blinded endpoint evaluation) design enrolling 450 high-risk patients with symptomatic carotid artery stenosis.
Patients are required to have an Essen score ≥ 3, indicating high vascular risk.
Participants are randomly assigned 1:1 to standard medical therapy plus RIC or standard medical therapy alone.
The trial is single-center and registered at ClinicalTrials.gov (NCT07412249).
A 20% dropout rate/loss-to-follow-up was anticipated and accounted for in the sample size calculation.
Methods
The RIC protocol involves bilateral upper-arm cuff inflation to 200 mmHg performed in 5 cycles of 5-minute inflation and 5-minute deflation, conducted 1–2 times daily.
RIC is initiated 3 days before CAS and continued for 12 months post-procedure.
This constitutes a combined peri-procedural and chronic RIC strategy.
Safety endpoints specifically monitor RIC-related adverse events including limb pain, petechiae, and peripheral nerve injury.
Methods
The primary efficacy endpoint is the composite of stroke, myocardial infarction, TIA, and vascular death within 12 months.
The trial assumes a 12-month event rate of 20% in the control group.
A 40% relative risk reduction with RIC is assumed for power calculations.
The trial is powered at 80% with a two-sided alpha of 0.05.
These assumptions require 355 patients, which is inflated to 450 accounting for dropout and interim analysis consumption.
Background
The trial is designed to address the currently unknown long-term benefit and safety of chronic RIC in patients undergoing CAS.
Prior evidence suggests RIC benefit in CAS patients, but long-term data are lacking.
RIC is described as 'a promising non-invasive strategy to protect the brain.'
The trial aims to provide 'high-level evidence on the role of long-term RIC as an adjunctive therapy' for this population.
Both efficacy and safety endpoints are pre-specified, with safety encompassing any serious adverse event in addition to RIC-specific events.
What This Means
This paper describes the design of a clinical trial called RICSICAS, which is testing whether a technique called remote ischemic conditioning (RIC) can help prevent strokes and other serious cardiovascular events in people who have dangerous narrowing of the carotid artery (the main artery supplying blood to the brain) and are undergoing a procedure called carotid artery stenting (CAS). RIC involves repeatedly inflating a blood pressure cuff on the arm to temporarily restrict blood flow, which is thought to trigger the body's natural protective mechanisms and help shield the brain and heart from damage. In this trial, patients in the treatment group will perform this cuff inflation exercise 1–2 times per day, starting 3 days before their stenting procedure and continuing for a full year afterward.
The trial plans to enroll 450 high-risk patients and randomly assign them to either receive RIC in addition to standard medications or standard medications alone. Researchers will then track whether patients experience strokes, heart attacks, mini-strokes (TIAs), or death from vascular causes over the 12-month follow-up period. The trial is specifically designed with enough participants to detect a 40% reduction in these events if RIC is truly effective, and it will also carefully monitor whether the cuff-inflation procedure causes any harm, such as arm pain or nerve injury.
This research matters because, while some earlier studies have suggested that RIC might be beneficial around the time of carotid stenting, no large trial has examined whether doing it long-term—for a full year—provides lasting protection. The results of RICSICAS could help determine whether this simple, non-invasive, self-administered technique should become a standard part of care for people at high risk of stroke following carotid artery stenting.
Qiu J, Li W, Zhao Y, Wang J, Wang L, Chen H. (2026). Remote ischemic conditioning plus stenting for symptomatic carotid artery stenosis (RICSICAS): rationale and design.. Frontiers in neurology. https://doi.org/10.3389/fneur.2026.1915534