Which of the following symptoms indicates symptomatic bradycardia?

Symptomatic bradycardia refers to a slow heart rate that is accompanied by symptoms indicating that the body is not receiving enough oxygen. Altered mental status is a key indication of this condition because it reflects inadequate cerebral perfusion. When the heart rate is too low, the brain may not receive sufficient blood flow and oxygen, leading to confusion, dizziness, or even loss of consciousness.

Restlessness, nausea, and abdominal pain can be related symptoms but are not specific indicators of symptomatic bradycardia. Restlessness may occur due to various reasons, including anxiety or discomfort, while nausea and abdominal pain are more commonly attributed to gastrointestinal issues or other systemic problems. Altered mental status is a more direct consequence of impaired blood flow to the brain, making it a definitive symptom of symptomatic bradycardia.