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Patient
17-year-old adolescent with no prior history, asymptomatic;
Trace
This tracing shows an irregular sinus atrial activity with successive accelerations and slowings; the remainder of the electrocardiogram is within normal ranges; probable physiological sinus arrhythmia in an adolescent patient;
Exergue
Childhood or adolescent respiratory arrhythmia results in the presence of an irregular sinus rhythm (acceleration at the onset of inspiration and slowing at the onset of expiration) with no pathological features.
Childhood or adolescent respiratory sinus arrhythmia is one of the most common "arrhythmias" in clinical practice. It corresponds to fluctuations in periodicity of sinus node related to reflex variations in vagal tone.