Fetal and neonatal arrhythmias are diverse in type and severity. They include both tachycardias and bradycardias.1 The innate physiological properties of the fetal and neonatal myocardiums make them more vulnerable to these high or low ventricular rates. Irregularities of fetal and neonatal cardiac rhythm commonly occur, and rarely have serious consequences; however, it is important to realize that sustained tachycardias and bradycardias can lead to heart failure and hydrops fetalis.2,3
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