Скачать или смотреть ECG-4 A dipole in the heart is reflected as different waves on ECG electrodes at different locations

In electrocardiography the position of the POSITIVE SIDE OF THE DIPOLE and the POSITIVE ECG ELECTRODE "RELATIVE" to each other is extremely important because this determines the size and the shape of the ECG waves.

A dipole in the heart is expressed by an arrow that is called a VECTOR. Vector arrow is RED in this video. Arrow-head of the vector points to the POSITIVE SIDE OF THE DIPOLE, length of it tells about the strength of the dipole. The electrode axis is represented by a BLACK arrow. The arrow-head of it points to the POSITION OF THE POSITIVE ELECTRODE, its length is not important.

This video explains how a constant dipole and positive electrodes at different positions form EKG waves. To find out the sizes of EKG waves obtained by electrode axes at different angles we draw a perpendicular line from the vector to the electrode axes.

When the vector and the electrode axis are PARALLEL to each other the EKG wave formed by the dipole is of maximum size. (Positive electrode is at "0" zero or 180 degrees.)

When the vector and the electrode axis are PERPENDICULAR to each other EKG either draws a straight line or a small bi-phasic wave. (Positive electrode is at +90 or -90 degrees.)

Going from "0" or 180 degrees to +90 or -90 degrees, the amplitude of the ECG waves gradually decreases.

ECG, EKG, electrocardiography, dipole, vector, electrode axis, frontal plane, vertical plane, heart, Neslihan Hacer Dikmenoğlu Falkmarken