A patient monitor is a device used to continuously measure a patient's vital signs, such as heart rate, blood pressure, and oxygen saturation levels. An ECG machine, also known as an electrocardiograph, is used to measure the electrical activity of the heart. This information can be used to diagnose heart problems. Patient monitors and ECG machines help health care workers monitor a patient's condition during surgery, delivery, or emergency situations. They can be used to track the healing process for patients in intensive care units after surgery. Patient monitors and ECG machines provide data that can be used to detect changes in the patient's condition before they become critical.