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Chapter: Medicine and surgery: Cardiovascular system
Atrioventricular block - Conduction disturbances
Atrioventricular or heart block describes an alteration in the normal pattern of transmission of action potentials between the atria and the ventricles.
Conduction disturbances
Atrioventricular block
Atrioventricular or heart block describes an alteration in the normal
pattern of transmission of action potentials between the atria and the
ventricles. The normal function of the AV node is to delay the transmission of
action potentials and hence protect the ventricles from transmission of atrial
rates fast enough to impair cardiac filling. Block at the AV node may result in
(see Fig. 2.10)
·
a prolongation of the time
required for transmission (first degree block).
·
intermittent failure of
transmission (second degree block).
·
complete failure of transmission
(third-degree heart block).
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Medicine and surgery: Cardiovascular system