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Background and Purpose— Peripheral immune cells are activated after stroke and may in turn influence the fate of ischemic brain tissue, thus exerting a dual role in ischemic stroke. We evaluated the contribution of neutrophil and lymphocyte counts to hemorrhagic complications and functional outcome in stroke patients treated with mechanical thrombectomy (MT) with varying degrees of collateral circulation and reperfusion. Methods— We retrospectively analyzed 433 consecutive ischemic stroke patients treated with MT. Neutrophil and lymphocyte counts and the neutrophil-to-lymphocyte ratio (NLR) were collected before MT and 1 day after symptom onset. Outcome measures included categories of hemorrhagic transformation, symptomatic intracerebral hemorrhage, 3-month functional dependence (modified Rankin Scale, 3–6), and mortality. Patients were categorized according to their baseline collateral status and the degree of reperfusion after MT. Results— Neutrophil counts and NLR increased, whereas lymphocyte counts decreased after MT (P &lt;0.001), and changes in neutrophils and NLR at day 1 were significantly greater in patients with poor reperfusion. Neutrophil counts and NLR were significantly higher already at admission in patients with poor 3-month outcome. In adjusted analysis, the impact of neutrophilia on poor functional outcome was more substantial in patients with good collaterals achieving successful reperfusion (aOR, 3.09 per quartile; 95% CI, 1.95–4.90), whereas admission lymphopenia (aOR, 4.08 per decreasing quartile; 95% CI, 1.56–10.64) and higher NLR (aOR, 3.76 per quartile; 95% CI, 1.44–9.79) predicted subsequent symptomatic intracerebral hemorrhage in patients with poor collaterals and successful reperfusion.Conclusions— In patients treated with MT, neutrophil and lymphocyte counts are dynamic parameters associated with hemorrhagic complications and long-term outcome. The extent of collateral circulation and the success of brain reperfusion influence the strength of these associations and highlight the dual role of leukocytes in acute stroke.

Leukocytes, Collateral Circulation, and Reperfusion in Ischemic Stroke Patients Treated With Mechanical Thrombectomy