<unk>  is a type of arrhythmia caused by the presence and function of a secondary pacemaker in the heart, which works in parallel with the SA node.<unk> c pacemakers are protected from depolarization by the SA node by some form of entrance block. This block can be complete or incomplete.<unk> c pacemakers can exist in the atrium or the ventriculus. Atrial<unk> a are characterized by being a type of narrow QRS complexes Arrhythmia.
Parasystole
Ovum
Blastocyst
Elementary particle
Coccidia
Parasitic worm
Spirochaete
Pinworm