An ECG (electrocardiogram) machine is a vital medical device used to measure and record the electrical activity of the heart over a specific period. This machine functions by detecting and amplifying the small electrical signals generated by the heart as it contracts and relaxes during each heartbeat. The device typically includes electrodes that are placed on the patient's chest, arms, and legs to capture the heart's electrical impulses, along with leads or cables that connect these electrodes to the main unit. Within the main unit, sophisticated electronic circuitry processes the signals and generates visual representations known as electrocardiograms (ECGs). These ECG tracings display the heart's rhythm, rate, and other electrical characteristics, providing valuable diagnostic information to healthcare professionals. ECG machines are widely used in clinical settings for diagnosing various heart conditions, including arrhythmias, myocardial infarction, and conduction abnormalities, making them indispensable tools in cardiology and emergency medicine.