Which machine is used to perform an EKG?

The machine used to perform an EKG, or electrocardiogram, is the electrocardiograph. This device is specifically designed to measure the electrical activity of the heart over a period of time. It records the heart's electrical signals, which can then be analyzed to identify various heart conditions, such as arrhythmias, heart attacks, and other cardiovascular issues.

The electrocardiograph works by attaching electrodes to the skin, which detect the electrical impulses generated by the heart as it beats. The data collected by the electrodes is then transformed into a graphical representation known as an electrocardiogram, allowing healthcare providers to assess the heart's health and diagnose potential problems.

Other machines listed, such as defibrillators, are used for delivering shocks to restore normal heart rhythm, ultrasound machines are utilized for imaging purposes, and heart monitors are often used to track heart activity continuously but do not provide the detailed, permanent record that an EKG does. Thus, the electrocardiograph is uniquely suited for this specific function.