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In page Automated insulin delivery system:

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Hybrid closed loop (HCL) systems further expand on the capabilities of PLGS systems by adjusting basal insulin delivery rates both up and down in response to values from a continuous glucose monitor. Through this modulation of basal insulin, the system is able to reduce the magnitude and duration both hyperglycemic and hypoglycemic events. Users still must initiate manual mealtime boluses.[1] Advanced hybrid closed loop systems have advanced algorithms.[citation needed]