semihorizontal heart

sem·i·hor·i·zon·tal heart

loosely refers to the hearts electrical axis when this is directed at approximately 0°. As a cardiac electrical position, recognized in the electrocardiogram when the QRS complex in lead aVL resembles V6 whereas that in aVF is small algebraically or absolutely.

semihorizontal heart

[-hôr′əzon′təl]
an electric "position" of the heart that lies between the horizontal and intermediate positions when the QRS axis is 0 degrees.

sem·i·hor·i·zon·tal heart

(sem'ē-hōr'i-zon'tăl hahrt)
Refers to the heart's electrical axis when this is directed at approximately 0 degrees.