Remote Ischemic Conditioning for Acute Moderate Ischemic Stroke Due to Large Artery Atherosclerosis (RIC-LAA)

Large Artery Atherosclerosis is one of the most prevalent causes of stroke worldwide and is associated with a high risk of disability and recurrent strokes. Remote Ischemic Conditioning (RIC) is a promising therapy, and it has been recommended for further investigation in patients with acute ischemic stroke resulting from large artery atherosclerosis. The primary objective of this study is to assess the efficacy of RIC in patients suffering from acute moderate ischemic stroke due to large artery atherosclerosis.

This multi-centered, open-label, blind endpoint, randomized controlled trial aims to investigate the efficacy of RIC in patients with acute moderate ischemic stroke due to large artery atherosclerosis. A total of 1150 participants (age 18 to 85 years) within 48 hours of symptom onset of acute moderate ischemic stroke (NIHSS score 6-16, or NIHSS score 4-5 with disabling deficits) due to large artery atherosclerosis will be enrolled. Eligible patients will be randomized in a 1:1 ratio into RIC treatment plus medical management versus medical management alone after offering informed consent.

The primary endpoint is excellent functional outcome at 90 days, defined as a modified Rankin Scale score of 0 to 1, which will be evaluated by independent researchers in the blind state.

Eligibility Criteria:
Inclusion Criteria:

1. Male or female with age from 18 to 85 years old;
2. Randomization must be within 48 hours after stroke symptom onset;
3. Ischemic stroke confirmed by MRI diffusion-weighted imaging;
4. NIHSS score 6-16, or 4-5 with disabling deficits at the time of randomization. The following typically should be considered disabling deficits: Complete hemianopsia (≥2 on NIHSS question 3) or severe aphasia (≥2 on NIHSS question 9), or visual or sensory extinction (≥1 on NIHSS question 11) or any weakness limiting sustained effort against gravity (≥2 on NIHSS question 6 or 7)；
5. Proven large vessel 50%-99% stenosis or occlusion by MRA, CTA or DSA in cervical or intracranial carotid artery, MCA \[M1 or M2\], vertebral artery, or basilar artery. Acute neurological deficit and cerebral infarction are compatible with ischemia in the vascular territory;
6. Pre-stroke modified Rankin Scale score (mRS) of 0-1；
7. Signed Informed Consent obtained.

Exclusion Criteria:

1. Thrombolysis or endovascular therapy performed or planned for index event;
2. Suspected or confirmed cardioembolic source of stroke: i. The aetiology of cardiogenic embolism with high embolic potential, such as atrial fibrillation, atrial flutter, rheumatic mitral or aortic stenosis, artificial heart valve, left atrial myxoma, valve neoplasm，left ventricular wall thrombus, congestive heart failure, bacterial endocarditis，cardiomyopathy，myocardial infarction within previous 30 days; ii. Multiple cerebral infarctions in more than one vascular territory (e.g., bilateral MCA, or an MCA and a basilar artery) confirmed MRI diffusion-weighted imaging;
3. Suspected or confirmed uncommon causes of cerebrovascular disorders：arterial dissection, Moyamoya disease，vasculitis disease, neurosyphilis, radiation induced vasculopathy, fibromuscular dysplasia, benign angiopathy of central nervous system, post-partum angiopathy, suspected vasospastic process, suspected recanalized embolus etc.;
4. Subclavian artery stenosis ≥ 50% or subclavian steal syndrome;
5. Refractory hypertension (defined as persistent systolic blood pressure \>185 mmHg or diastolic blood pressure \>110 mmHg after drug treatment);
6. Evidence of intracranial tumor (except small meningioma), abscess, arteriovenous malformation or aneurysm；
7. Patients with bleeding propensity: platelet count \<50×10\^9/L; heparin was administered within 48 hours with APTT≥35s; on anticoagulant therapy with warfarin and International Normalized Ratio (INR) \> 1.7;
8. Undergoing hemodialysis or peritoneal dialysis, or known severe renal insufficiency with glomerular filtration rate \<30 ml/min or serum creatinine \>220 mmol/L (2.5mg/dl);
9. Any contraindication for Remote Ischemic Conditioning: severe soft tissue injury, fracture, peripheral vascular disease，arteriovenous fistula, or venous thrombosis in the upper limbs;
10. Severe comorbid condition with life expectancy \< 6 months；
11. Current participation in any other investigational trial；
12. Pregnancy；
13. Patients not suitable for this clinical study considered by researchers.