NHS Borders confirmed the service had now commenced, which will aim to help patients return home or to their next place of treatment, within four days.
The health board said this will help combat negative health impact and loss of independence from staying in hospital longer than necessary.
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Gareth Clinkscale, director of urgent care, community services and mental health, said: “We are delighted our new Frailty Unit is now open.
“Our dedicated team will focus on rapid assessment and tailored care ensuring our older patients get the care they need quickly and are supported to return home or to their next place of care within a few days.
“By working together with families and carers, we will improve outcomes and ensure care continues in a way that works best for patients and their families.”
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The unit is supported by a team of specialist healthcare professionals at the BGH.
Families and carers are asked to help support the team by helping loved ones prepare for discharge before 12 noon.
This includes making sure the heating is on at home, stocking the fridge with essentials, being available to collect residents in the morning and helping them settle back at the house.