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Hi, this is Dr Sathya. Thanks for your question and I will try my best to help you.
If the carotid artery blockage (or stenosis) is total (that is 100% blockage) then carotid surgery is not recommended.
If there is a major or severe stenosis but no total blockage (stenosis is between 79% and 99%) then carotid surgery is recommended irrespective of whether the patient has had mini stroke or strokes.
If there is a moderate stenosis (blockage between around 50% and 79%) then carotid surgery is recommended - only if there is a history of mini stroke or stroke, but not otherwise.
If the stenosis is mild (blockage less than 50%) then surgery is not recommended, irrespective of whether patient has a history of mini stroke or stroke or not.
So up to about 50% of the stenosis or blockage is acceptable and doesn't require any surgery irrespective of whether there is a history of any mini stroke or stroke or not, and up to about 70% stenosis or blockage is acceptable before surgery provided there is no history of any mini strokes or strokes.
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