has material basis in germline mutation in KCNA1 syndromic disease myopathy hereditary continuous muscle fiber activity https://github.com/monarch-initiative/mondo/issues/8724 https://rarediseases.info.nih.gov/diseases/1512/continuous-muscle-fiber-activity-hereditary https://www.malacards.org/card/hereditary_continuous_muscle_fiber_activity MEDGEN:331775 continuous muscle fibre activity, hereditary Orphanet:972 UMLS:C1834559 continuous muscle fiber activity hereditary MONDO:0019943 continuous muscle fiber activity, hereditary continuous muscle fibre activity hereditary Hereditary continuous muscle fiber activity is a rare, non-dystrophic myopathy characterized by generalized myokymia and increased muscle tone associated with delayed motor milestones, leg stiffness, spastic gait, hyperreflexia and Babinski sign. Symptoms may be worsened by febrile illness or anesthesia. GARD:0001512 hereditary skeletal muscle disorder