What is an ECG machine primarily used for?

The ECG (electrocardiogram) machine is primarily utilized to measure and record the electrical activity of the heart. This process involves detecting the electrical impulses that trigger each heartbeat, allowing healthcare professionals to assess heart rhythm and identify a variety of cardiac conditions. By printing or displaying the resulting waveforms, an ECG provides valuable data regarding the heart's health, including the rate and regularity of heartbeats and the size and position of the heart chambers.

The other options highlight different functions and equipment used in medical settings but do not pertain to the primary function of an ECG machine. Fluid therapy is managed by infusion pumps or fluid administration systems, surgical assistance involves various instruments and devices tailored to specific procedures, and blood glucose levels are determined using glucometers or continuous glucose monitoring systems. Thus, none of these options accurately describes the purpose of an ECG, reinforcing the importance of recognizing its dedicated role in cardiac monitoring.