Материал: Презентация экг инглиш

The chest leads also reflect the balance between the right and left sides of the heart:

V1 and V2 - right chest

V5 and V6 - left chest

V3 - V4 - transition zone

normal electrical axis

Left ventricular hypertrophy

-An increase in the amplitude of the R waves in V5 and V6 (it is higher than in V4), and S in V1 and V2, R in I and R in aVL.

-QRS width grows = 0.10 - 0.12 s

-Deviation of the electrical axis of the heart to the left (angle α <0º).

R I> R II> R III, high R in lead I and deep S in III.

-An increase in the time of internal deviation in V5, V6 leads (from the beginning of the R wave to its apex)> 0.05 s.

-With severe left ventricular hypertrophy: ST segment in I, AVL, V5, V6 below the isoline ("trough-shaped"), T is negative.

-Displacement of the transition zone to the right chest leads.

Sokolov - Lyon amplitude criteria.

R in I> 15 mm; R in I + S in III (or II)> 25 mm.

R in aVL> 11 mm.

R in V5 or V6> 25 mm.

R in V5 or V6 + S in V1 or V2> 35 mm.

left-ventricular hypertrophy

left-ventricular hypertrophy