PATHOLOGY

Detailed explanation-1: -ECGs are the primary clinical tool to measure electrical and mechanical performance of the heart. The ECG works by detecting and amplifying tiny electrical changes on the skin that occur during heart muscle depolarization.

Detailed explanation-2: -The normal pattern of electrical activity that is seen on an ECG is called a sinus rhythm. Each heartbeat produces a regular, identifiable pattern; the P wave, the QRS complex, and the T wave. These segments identify the electrical activity of specific parts of the heart.

Detailed explanation-3: -For regular heart rhythms, heart rate can easily be estimated using the large squares (0.2s) on an ECG. Simply identify two consecutive R waves and count the number of large squares between them. By dividing this number into 300 (remember, this number represents 1 minute) we are able to calculate a person’s heart rate.