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  1. Heart valve disease presenting in adults: investigation and management - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK577831
    ... that an increase of systolic pulmonary artery pressure (SPAP) to more than 60 mmHg on exercise was ... be better. Evidence from 1 study showed that SPAP above 60 mmHg on exercise was associated with ...