Final answer:
An electrocardiogram, abbreviated as ECG or EKG, is the correct term for a chart that records the electrical impulses of the heart, used as a diagnostic tool with various leads to provide detailed recordings.
Step-by-step explanation:
The correct spelling of the word for a chart that records the electrical impulses of the heart is electrocardiogram, often abbreviated as ECG or EKG. When conducting an electrocardiogram, surface electrodes are carefully placed on the body to record the complex electrical signals of the heart. The ECG is crucial in revealing both normal and abnormal functions of the heart and remains an indispensable diagnostic tool. It uses multiple leads to provide a detailed picture, with a standard electrocardiograph utilizing 3, 5, or 12 leads for better detail. Additionally, a Holter monitor may be used for continuous recording of heart electrical activity.