atrial flutter idiopathic neonatal atrial flutter https://github.com/monarch-initiative/mondo/issues/6740 https://www.malacards.org/card/idiopathic_neonatal_atrial_flutter MONDO:0018684 neonatal cardiac dysrhythmia ICD10CM:P29.1 Idiopathic neonatal atrial flutter (AFL) is a rare rhythm disorder, characterized by sustained tachycardia in newborns and infants with an atrial rate often at around 440 beats/minute (range 340-580). AFL may manifest as asymptomatic tachycardia, congestive heart failure or hydrops. SCTID:715560009 UMLS:C4275090 Orphanet:45452 GARD:0018831 MEDGEN:904097 icd11.foundation:208964573 idiopathic disease