THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Heart rate: The standard paper speed is 25 mm (5 large squares)/sec. This means that if the interval between two beats (R-R) is 5 large squares, the HR is 60 beat/min. The HR may be counted by simply dividing 300 by the number of the large squares between two heart beats (R-R).

Detailed explanation-2: -The ECG waves are recorded on special graph paper that is divided into 1 mm2 grid-like boxes (figure 1). The ECG paper speed is ordinarily 25 mm/sec.

Detailed explanation-3: -If the test is normal, it should show that your heart is beating at an even rate of 60 to 100 beats per minute. Many different heart conditions can show up on an ECG, including a fast, slow, or abnormal heart rhythm, a heart defect, coronary artery disease, heart valve disease, or an enlarged heart.

Detailed explanation-4: -The standard gain setting used when recording a 12-lead ECG is 10 mm = 1 mV. This setting must be used when the amplitude of ECG components, such as R wave height and ST segment deviation, are measured manually (parameters calculated automatically take the gain setting into account).