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Conduction: Difference between revisions
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→The PQ interval: added that PQ/PR prolongation can be caused by increased vagal tone or pharmacologically induced
(→The PQ interval: noted that PQ interval is sometimes referred to as the PR interval as the Q wave is not always present) |
(→The PQ interval: added that PQ/PR prolongation can be caused by increased vagal tone or pharmacologically induced) |
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'''The normal PQ interval is between 0.12 and 0.20 seconds'''. | '''The normal PQ interval is between 0.12 and 0.20 seconds'''. | ||
A prolonged PQ interval is a sign of a degradation of the conduction system. This is called [[Arrhythmias#Atrioventricular_block|1st, 2nd or 3rd degree AV block]]. | A prolonged PQ interval is a sign of a degradation of the conduction system, increased vagal tone (Bezold-Jarisch reflex), or it can be pharmacologically induced. | ||
This is called [[Arrhythmias#Atrioventricular_block|1st, 2nd or 3rd degree AV block]]. | |||
A short PQ interval can be seen in the [[Arrhythmias#WPW_syndrome|WPW syndrome]] in which a faster connection exists between the atria and the ventricles. | A short PQ interval can be seen in the [[Arrhythmias#WPW_syndrome|WPW syndrome]] in which a faster connection exists between the atria and the ventricles. | ||