potassium-aggravated myotonia myotonia fluctuans MF icd11.foundation:1294270721 Fluctuating myotonia GARD:0016904 SCTID:715788001 Orphanet:99734 exercise-induced delayed-onset myotonia MEDGEN:156269 Myotonia fluctuans (MF) is a form of potassium-aggravated myotonia (PAM) which is cold insensitive, dramatically fluctuating and profoundly worsened by potassium ingestion. NCIT:C122789 UMLS:C0752355 MONDO:0020481