This paper is an approach to managing PMR that the then Bristol group under Prof Kirwan used which reduced the rate of flare from 3 in 5 to 1 in 5 and which I have quoted many many times. It is aimed at GPs but obviously a lot of rheumies could do with reading it too!
Our approach to the diagnosis and treatment of polymyalgia rheumatica and giant cell (temporal) arteritis (PDF Download Available). Available from: researchgate.net/publicatio...
There are things in it that on the basis of experience I disagree with - on his criteria I don't have PMR (never had a raised APR in my life (that's ESR and CRP) but maybe my response to 15mg pred would have convinced him had he tried it!
But on duration of PMR and slow tapering they say
"Evidence from published cohorts of patients suggests that the dose should then be slowly reduced and that stopping PMR treatment is feasible from two years onwards. Rate of steroid tapering at more than 1 mg/month is a clear predictor of relapse. "
So clearly refuting the concept PMR lasts months although no mention it can go on much longer - and supporting slow reductions.