APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -ECG paper is a grid where time is measured along the horizontal axis. Each small square is 1 mm in length and represents 0.04 seconds. Each larger square is 5 mm in length and represents 0.2 seconds.

Detailed explanation-2: -The horizontal lines measure time intervals and heart rate. Each of the small squares equal 0.4 second of time. Five small squares equal 0.20 seconds.

Detailed explanation-3: -The electrocardiogram paper is a graph paper where for every five small (1 mm) squares you can find a heavier line forming a larger 5 mm square. The vertical axis measures the amplitude of the heart’s electrical current. It is measured in millivolts (mV). By standard, 10 mm in height equals 1 mV.