EFFECTS OF CHANGES IN POSITION OF THE HEART OF THE CHICKEN ON THE ELECTROCARDIOGRAM

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Abstract
The hearts of chickens were rotated on their anterior-posterior axes to the right and the left. In rotation II and III to the left there was a decrease in amplitude of S and of T in leads II and III with the decrease greatest in III. In lead I before rotation the ecgs. of most of the birds exhibited a small R, no S, and usually a negative T. After rotation, R decreased or disappeared and was replaced by an S wave, and T became positive. The electrical axes for RS increased in most instances after rotation and the T axes decreased. The degree of change in the axes was not directly proportional to the degree of rotation of the heart, but in most instances the change was greater with the higher degrees of rotation. Rotation to the right resulted in a decrease in amplitude of S and of T in leads II and III with the decrease greatest in II. In lead I, R and the negative T, present in most birds before rotation, increased in amplitude after rotation. The electrical axes for RS decreased after rotation and the T axes increased. The degree of change in the RS axes was greater in rotation of the heart to the right than to the left, but the change was not directly proportional to the degree of rotation. In most instances, the change was greater with the higher degrees of rotation.

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