Frequency the number of pediatric patients with cardiac dysrhythmias is increasing mainly because a common sequela of cardiac surgery is damage to the specific conduction system and working myocardium dysrhythmias also are being recognized more frequently in children who have no structural heart disease this discovery is probably due to increased awareness on the part of pediatricians that certain cardiac dysrhythmias in otherwise normal children are important we must not let this new . The authors have succeeded in writing a clear and concise text on all aspects of pediatric cardiac dysrhythmias including electrophysiological studies in the past ten years pediatric cardiologists have demonstrated increased interest and understanding of the intricacies of complex dysrhythmias that have long been considered the province and stepchild of adult electrocardiographers in . Pediatric dysrhythmias 87 hypoxia anemia hypovolemia shock myocardial ischemia pulmonary edema hyperthyroidism medications catecholamines hypocalcemia and illicit drug. Supraventricular tachycardia is the most common symptomatic pediatric tachyarrhythmia atrial flutter and atrial fibrillation in children are attributed largely to structural heart disease bradycardia is defined as a heart rate less than the lower limit of normal for a childs age and the most common cause is sinus bradycardia despite the infrequent occurrence of arrhythmias it is crucial to expeditiously identify and treat certain rhythm abnormalities because they can lead to further