What is the name of the device commonly used to display waveforms in cardiac monitoring?

The device known for displaying waveforms in cardiac monitoring is the oscilloscope. This instrument is designed to visually represent electrical signals in the form of waveforms, which is crucial for analyzing the electrical activity of the heart. The oscilloscope provides real-time visualization, allowing healthcare professionals to assess the shape, timing, and frequency of the cardiac electrical signals, which is essential in diagnosing various cardiac conditions.

While the electrocardiogram also displays electrical activity of the heart, it typically records and prints these waveforms onto paper or a digital format rather than providing continuous real-time visualization like an oscilloscope. A stethoscope is primarily used for auscultation to listen to heart sounds and does not display electrical waveforms. A monitor can refer to multiple devices within a healthcare setting, but in the context of cardiac monitoring, it generally refers to screens that display data, including ECG readings, but it's not specifically identified as a device that directly visualizes waveforms in the same manner as an oscilloscope. Thus, the oscilloscope is the most accurate choice for showcasing waveforms in cardiac monitoring.