...She also had a vague out with slurred speech today - I did not see it, but she said the OT got a nurse, who got a doctor, who said it was normal and not anything to worry about. No scans taken. Should I be worried about this?
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Whilst (as an experienced stroke doctor also a Geriatrician), I wouldn't say it was normal, it's not uncommon and a cause may not be discovered even with extensive (potentially arduous) testing..
Various possibilities including dehydration, BP drop in a mending brain, brewing infection. It doesn't sound particularly like a small seizure but that might be a consideration if recurs.
Another stroke is not highly likely, but with mild transient symptoms and a recent stroke, the big interventions (clot-busting (thrombolysis) and removing clot via the groin) are not in play as risks outweigh benfit. Personally, I'd order a CT to check for bleeding but many of my colleagues would not.
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Contrary to the initial counselling, once through the first couple of weeks, on good preventative treatment and without an uncommon untreatable cause, the risk of another stroke should be less than 5% a year.
That's not to say that a small to medium-sized stroke in the elderly is trivial. The essence of frailty is the lack of reserve to withstand illnesses and, as you've seen, it has knocked your mother about.
Nevertheless, stroke is a condition with scope for recovery over weeks and months. Things frequently improve more than one might expect.
Best wishes at a difficult time