La sindrome del nodo malato può esser associata a tachicardia (ritmo cardiaco veloce), come la tachicardia sopraventricolare parossistica e la fibrillazione atriale. ###>Sick sinus syndrome may also be associated with tachycardias (fast heart rate) such as paroxysmal supraventricular tachycardia (PSVT) and atrial fibrillation.