In a medical context, bradycardia can often be monitored using which device?

Bradycardia, which is defined as a slower than normal heart rate, is typically monitored using an electrocardiogram (ECG). This device records the electrical activity of the heart over a period of time, displaying the heart's rhythm and rate. The ECG provides critical information by allowing healthcare professionals to visualize the heart's electrical impulses and identify abnormalities associated with bradycardia as well as other cardiac conditions.

Using an ECG is essential for accurate diagnosis and monitoring; it helps determine the underlying cause of bradycardia, whether it be related to intrinsic factors like the heart's conduction system or extrinsic factors such as medications.

The other devices listed have different functions. A thermometer measures body temperature, a sphygmomanometer assesses blood pressure, and a pulse oximeter evaluates oxygen saturation in the blood, none of which are designed specifically to monitor heart rate in the way an ECG does.