Though it is an understandable mistake, sinus arrhythmia has nothing to do with the nose. Rather, the term refers to the sinoatrial or sinus node in the heart. Like a clock, the heart ticks at regular intervals like a second-hand. Any deviation from this constant rhythm is an arrhythmia. The sinoatrial node is essentially the heart’s natural pacemaker, helping keep the heartbeat steady. Sinus arrhythmia is an irregularity in the heart’s rhythm, originating in the sinoatrial.
There are different types of sinus arrhythmia, but the most common affects breathing. In a person with respiratory sinus arrhythmia, the heart’s rhythm changes when breathing in and out. Inhaling causes the heart rate to increase while exhaling causes it to decrease. This type of sinus arrhythmia is common in children. As the heart is still growing, there are often slight fluctuations in the beats. The condition tends to disappear as the child's physiology matures.
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