Can leukaemia cause sinus problems ?
The sinus referred to in both your questions is the sinu-atrial node, which is the heart’s built-in pacemaker. Sinus arrhythmia is not a disease. It is normal variation in pulse rate, and is observed particularly in children and young adults. The parasympathetic nervous system is an important factor in determining pulse rate. As one breathes in, parasympathetic nervous activity falls and pulse rate rises; as one breathes out, the activity increases and our pulse rate falls. A classic example of parasympathetic activity is a “faint”. In these situations the patient’s pulse slows down until they temporarily lose consciousness. I hope that this reassures you.
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