Acute ischemic stroke caused by intracranial atherosclerotic stenosis presents severe technical challenges during mechanical thrombectomy. Neurointerventional teams frequently encounter immediate re-occlusion or unstable arterial flow due to residual atheromatous plaque. Consequently, endovascular specialists must select suitable salvage maneuvers to restore tissue perfusion. Practitioners increasingly debate whether to choose rescue balloon angioplasty or permanent intracranial stenting when first-line thrombectomy fails. Emerging comparative evidence offers valuable clarity regarding safety margins and functional recovery. Therefore, neurovascular specialists must understand how these rescue strategies influence procedural outcomes in acute clinical practice.

The Clinical Challenge of ICAS-Related Large Vessel Occlusion

Intracranial atherosclerotic stenosis accounts for a significant proportion of acute large vessel occlusions, particularly across Asian populations. Unlike purely cardioembolic clots, atherothrombotic occlusions involve inflamed, unstable vascular plaques beneath the thrombus. When operators retrieve the initial clot with a stent retriever or aspiration catheter, the underlying stenosis often causes rapid platelet aggregation. Therefore, vessel re-occlusion occurs in up to half of these complex cases. This mechanism directly frustrates standard thrombectomy attempts and impairs neurological salvage. Furthermore, repeated device passes cause mechanical vessel injury and endothelial denudation. Consequently, mechanical irritation increases the local thrombogenic potential. Neurointerventional teams must therefore establish swift and effective salvage strategies to preserve cerebral microcirculation. Practitioners historically deployed permanent intracranial stents to secure luminal patency. However, permanent hardware demands emergency aggressive antiplatelet therapy, which sharply increases intracranial bleeding risks. Alternatively, rescue angioplasty without stenting offers a mechanical remodeling alternative without leaving foreign metallic architecture behind. Thus, clinicians require definitive evidence to guide their immediate technical choices during emergent neurointerventions.

Study Design and Rescue Balloon Angioplasty Outcomes

To address this dilemma, a multicenter retrospective study investigated 321 patients who underwent endovascular salvage for intracranial stenosis-related occlusion. The researchers screened a wide registry of 1601 patients presenting with acute large vessel occlusion. Among the analyzed cohort, 212 individuals received rescue balloon angioplasty, whereas 109 patients underwent intracranial rescue stenting. The study evaluated primary functional independence at three months using the modified Rankin Scale. Additionally, the investigators assessed safety metrics, focusing primarily on symptomatic intracranial hemorrhage. At three months, the data revealed a favorable functional trend favoring the angioplasty cohort. Specifically, 45.8% of patients receiving balloon angioplasty achieved favorable functional outcomes compared to 34.9% in the stented group. Multivariate logistic regression indicated that rescue stenting was associated with lower odds of functional independence. Furthermore, the overall mortality rates demonstrated reassuring safety for balloon remodeling. Consequently, these findings suggest that avoiding permanent hardware in the acute hyperacute phase confers meaningful clinical benefits. Balloon angioplasty successfully restores adequate hemodynamic flow while minimizing acute tissue disruption. Therefore, many patients achieve meaningful clinical recovery without the risks associated with acute stenting.

Safety Profiles and Intracranial Hemorrhage Risks

Safety considerations play a pivotal role when selecting endovascular salvage techniques during acute ischemic stroke. In this comparative cohort, rescue stenting showed a higher incidence of symptomatic intracranial hemorrhage. Specifically, symptomatic bleeding occurred in 11.0% of stented patients compared to only 4.2% of those treated with balloon angioplasty alone. This substantial difference represents a critical clinical safety signal for neurointerventionalists. Stenting inherently requires acute antiplatelet loading, such as intravenous glycoprotein IIb/IIIa inhibitors or oral dual antiplatelet therapy. Because ischemic brain tissue experiences blood-brain barrier disruption, intensive platelet inhibition dramatically heightens hemorrhage risks. In contrast, rescue balloon angioplasty frequently requires less aggressive antiplatelet regimens during the acute phase. Moreover, balloon dilatation gently displaces the atheromatous plaque without causing chronic radial arterial tension. Consequently, mechanical trauma to fragile intracranial perforators remains reduced. Stent struts, however, can shear microscopic perforating vessels near the middle cerebral or basilar arteries. Therefore, the higher hemorrhagic risk of stenting frequently offsets its mechanical recanalization advantages. Clinicians must weigh these hemorrhagic consequences against potential short-term re-occlusion when managing acute stroke patients.

Divergent Outcomes in Posterior Circulation Occlusions

The clinical disparity between rescue modalities proved particularly striking in posterior circulation occlusions. Within the posterior circulation subgroup, patients treated with stenting experienced significantly worse outcomes than those receiving balloon angioplasty. Specifically, favorable functional recovery occurred in only 20.5% of stented patients compared to 41.5% in the balloon cohort. Multivariate analysis confirmed that stenting independently lowered the odds of favorable recovery in this vascular territory. Basilar and vertebral arteries feature numerous critical perforating branches supplying vital brainstem nuclei. When operators deploy stents across these segments, stent struts can easily compromise delicate paramedian perforators. This snowplow effect causes fatal or disabling brainstem infarctions despite angiographic patency of the main trunk. Conversely, gentle balloon angioplasty reduces circumferential displacement against perforator ostia. Furthermore, the posterior circulation appears especially vulnerable to reperfusion injury and hemorrhagic transformation under potent antiplatelet coverage. Therefore, neurovascular specialists should exercise extreme caution before deploying emergency stents in acute vertebrobasilar occlusions. Rescue balloon angioplasty represents a far safer initial strategy to re-establish life-saving brainstem perfusion without obliterating microscopic perforating arteries.

Balancing Acute Safety and Long-Term Restenosis Prevention

Although balloon angioplasty demonstrates superior short-term safety, clinicians must also manage long-term vascular patency. Atherosclerotic plaques often retain significant elastic recoil following standalone balloon inflation. Consequently, residual stenosis may persist, and some patients remain vulnerable to delayed arterial restenosis. In contrast, intracranial stenting delivers rigid mechanical scaffolding that reliably prevents acute elastic recoil. Long-term observational studies confirm that stenting provides lower rates of delayed luminal narrowing. Therefore, the clinical decision requires balancing immediate procedural survival against delayed stenosis prevention. Many neurointerventional centers now adopt a phased, pragmatic strategy. Interventionalists prioritize balloon angioplasty during the emergency intervention to secure immediate perfusion with minimal bleeding hazard. If the vessel demonstrates stable flow without flow-limiting recoil, the operator avoids acute stenting. Clinicians can then monitor the patient closely with neurovascular ultrasound or CT angiography. If severe symptomatic restenosis develops later after brain recovery, operators can perform elective stenting in a stable, uninjured brain. Thus, staged interventions combine the immediate safety of balloon remodeling with the durable patency of delayed stenting.

Translating Clinical Evidence into Interventional Practice

These compelling findings provide valuable practical guidance for acute stroke multidisciplinary teams. When endovascular specialists treat emergent intracranial stenosis, they should resist the impulse to deploy stents immediately upon initial recoil. Instead, operators should consider gentle balloon angioplasty using undersized compliant or semi-compliant balloons as the primary rescue technique. Furthermore, interventionalists should maintain post-angioplasty observation for fifteen to twenty minutes in the angiography suite. This observation period confirms hemodynamic stability and excludes acute platelet consumption at the target site. Additionally, medical teams can minimize emergency glycoprotein IIb/IIIa inhibitor administration when avoiding permanent stent placement. Consequently, patients face fewer systemic and cerebral bleeding complications during critical neurointensive care management. Meanwhile, multidisciplinary protocols should emphasize intensive medical management, including statin therapy and monitored blood pressure goals. If the vessel displays persistent, flow-limiting thrombosis despite repeated angioplasty, stenting remains a valid secondary rescue alternative. However, clinicians must recognize the elevated bleeding hazard associated with emergency stenting. Therefore, adopting rescue balloon angioplasty as the default salvage maneuver maximizes patient survival and functional independence.

Why does rescue balloon angioplasty carry a lower bleeding risk than stenting?

Permanent intracranial stenting necessitates aggressive perioperative antiplatelet therapy to prevent acute in-stent thrombosis. In contrast, rescue balloon angioplasty requires less intense antiplatelet regimens during acute stroke management. Because ischemic brain tissue has a disrupted blood-brain barrier, reducing antithrombotic exposure significantly lowers the occurrence of symptomatic intracranial hemorrhage.

Why are clinical outcomes worse with rescue stenting in posterior circulation strokes?

The basilar and vertebral arteries give rise to essential perforating vessels supplying the brainstem. Deploying emergency stents frequently shifts atheromatous plaque over perforator ostia, causing secondary brainstem infarction. In contrast, gentle balloon dilatation minimizes snowplow plaque displacement and protects vital perforator flow, resulting in superior functional outcomes.

How should clinicians address the risk of restenosis after balloon angioplasty?

Clinicians can manage post-angioplasty restenosis risk through intensive secondary medical prevention and scheduled neuroimaging surveillance. If flow-limiting restenosis emerges after the acute ischemic penumbra stabilizes, interventionalists can safely perform elective stenting. This staged management strategy preserves acute tissue safety while securing long-term luminal patency in refractory intracranial atherosclerosis.

Disclaimer: This content is for informational and educational purposes only... Refer to the latest local and national guidelines for clinical practice.

References

Jiang Y et al. Comparing the effectiveness and safety of rescue balloon angioplasty versus stenting in acute large vessel occlusion after thrombectomy. Stroke Vasc Neurol. 2026 Mar 04. doi: 10.1136/svn-2024-003851. PMID: 40312064.

Al Kasab S, et al. Comparative Safety and Efficacy of Balloon-Mounted and Self-Expanding Stents in Rescue Stenting for Large Vessel Occlusion: Secondary Analysis of the RESCUE-ICAS Registry. AJNR Am J Neuroradiol. 2025;46(12):2145-2152.

Deng G, et al. Angioplasty and/or stenting after thrombectomy in patients with large vessel occlusion associated with underlying intracranial atherosclerotic stenosis: a meta-analysis and systematic review. Front Neurol. 2023;14:1181295.