in guideline Abnormal Cardiovascular System Physiology Arrhythmia SCDO:0009619 Irregular Heart Beat Any cardiac rhythm other than the normal sinus rhythm. Such a rhythm may be either of sinus or ectopic origin and either regular or irregular. An arrhythmia may be due to a disturbance in impulse formation or conduction or both. Abnormal Heart Rate HP:0011675 Cardiac Conduction Defects http://purl.obolibrary.org/obo/HP_0011675 Cardiac Rhythm Disturbances Cardiac Arrhythmia Abnormality of Cardiac Conduction Cardiac Conduction Abnormalities Arrhythmias Heart Rhythm Disorders Cardiac Arrhythmias Irregular Heartbeat Sufficient Recommendations for the Management of Sickle Cell Disease in South Africa Sickle Cell Disease: The Clinical Care Guidelines of the Sickle Cell Unit Consensus Statement on the Care of Patients with Sickle Cell Disease in Canada Sickle Cell Disease in Children, Standards and Guidelines for Clinic Care