A patient with sinus bradycardia may need treatment if which signs and symptoms are presented?

In cases of sinus bradycardia, treatment is typically indicated when a patient exhibits symptoms of inadequate perfusion, which relates to low blood pressure and the potential for insufficient blood flow to vital organs. Hypotension, or low blood pressure, can lead to decreased cerebral perfusion resulting in dizziness or lightheadedness, exacerbating the situation. This combination of hypotension and dizziness indicates that the bradycardia is significantly impacting the patient's hemodynamics and warrants intervention to restore normal heart rate and improve blood circulation.

The other options, while they can indicate various forms of discomfort or other conditions, do not directly reflect signs of critical hemodynamic compromise. Headaches and fatigue could be related to many non-cardiac conditions, hypertension with palpitations might suggest a different form of cardiac issue, and chest pain with nausea can indicate a range of problems that may or may not be acute conditions related to bradycardia itself. Therefore, the presence of hypotension and dizziness distinctly signals the need for treatment in the context of sinus bradycardia.