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DISTURBANCE OF CONDUCTION FUNCTION

Sinoauricular block (Fig. 37 a) — it is an interruption of impulse conduction from sinus node to atria and ventricles. Increase of n. vagus tone, hypoxia, hyperkalemia may be the cause of this. On the ECG atrial and ventricular complexes (PQRST) are dropped. A drop of both one and several atrioventricular complexes may be observed in succession. Clinically — a loss of pulse is noted.

Intra-atrial block (Fig. 37 b) P >0.10 sec. and it is deformed. Clinically it is not manifested.

Atrioventricular block (A-V block):

a) Complete (third degree) block (Fig. 37 c) — a complete impulse interruption from atria to ventricles;

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