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Hyperglycemia on hospital admission is a common phenomenon in acute ischemic stroke patients and represents an independent predictor of poor clinical outcome with or without acute recanalization therapies (systemic thrombolysis or mechanical thrombectomy). Effective restoration of normoglycemia is considered to be beneficial, but conclusive evidence from randomized controlled clinical trials and specific recommendations are lacking. In addition, aggressive glucose control can be complicated by hypoglycemia leading to early neurological deterioration. We conducted a systematic literature review with the aim of addressing several questions: timing of glucose control, target range, type of insulin delivery, duration and practicability of glucose-lowering protocols. Special issues regarding mechanical thrombectomy and glycemic variability can then be investigated in future trials which are also being considered.