Is remote ischaemic conditioning effective for patients with Acute Ischaemic Stroke and large-vessel occlusion?

Remote ischaemic conditioning (RIC) is a non-invasive treatment that involves briefly inflating a blood pressure cuff on an arm or leg to restrict blood flow, then releasing it. This is thought to trigger protective effects in the brain. For people with acute ischaemic stroke caused by large-vessel occlusion (a blockage in a major brain artery), the main treatment is mechanical thrombectomy to remove the clot. The question is whether adding RIC can improve recovery after this procedure. Current evidence suggests RIC may help some stroke patients, but its specific role in large-vessel occlusion is not yet proven.

What the research says

Several studies have looked at RIC for acute ischaemic stroke, but results are mixed. A 2018 Cochrane review found that existing evidence was not strong enough to confirm RIC's benefits for preventing or treating ischaemic stroke ⁷. However, a 2024 systematic review of 46 trials reported promising results for RIC's safety and therapeutic effect in neurological disorders, including acute ischaemic stroke ⁹. Another 2021 review noted that early clinical studies suggest RIC may benefit acute ischaemic stroke, but it highlighted unanswered questions about the optimal frequency, duration, and target patient groups ⁸.

For large-vessel occlusion specifically, a trial protocol called RECAST-MT is currently testing RIC in patients with acute ischaemic stroke due to large-vessel occlusion who are undergoing mechanical thrombectomy. This trial will compare 14-day RIC, 30-day RIC, and standard treatment alone, with results expected to clarify whether RIC improves 90-day functional outcomes ².

One secondary analysis from a large trial found that RIC significantly improved the chance of excellent functional recovery (mRS 0-1) at 90 days in non-smokers with moderate stroke, but not in smokers ⁶. This suggests that patient characteristics like smoking status may influence RIC's effectiveness, though this finding is from a subgroup analysis and needs confirmation.

Overall, the evidence for RIC in acute ischaemic stroke is promising but not definitive. The ongoing RECAST-MT trial is specifically designed to answer whether RIC helps patients with large-vessel occlusion after thrombectomy ². Until those results are available, doctors cannot yet say for certain that RIC is effective for this specific group.

What to ask your doctor

• Is remote ischaemic conditioning available as an add-on to my thrombectomy treatment?
• What does the current evidence say about RIC for large-vessel occlusion stroke?
• Are there any ongoing trials of RIC for stroke that I might be eligible for?
• Could my smoking status affect whether RIC would help me?
• What are the potential risks or side effects of RIC?