Sinus block in adolescents is usually detected during a physical examination or when visiting the hospital after symptoms such as palpitations, blackouts and dizziness.
If a patient is found to have sinus block on physical examination, the presence of second degree sinus block on further examination without associated symptoms is usually not of serious consequence.
If a patient is found during a hospital examination for palpitations, darkness and dizziness, then sinus atrial block, which may be more severe, should be taken seriously by the patient and their family to prevent the most serious symptom of cardiac arrest, and early intervention, if necessary with a pacemaker, can be very effective.