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Conduction: Difference between revisions
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==The PQ | ==The PQ interval== | ||
The PQ | The PQ interval starts at the beginning of the atrial contraction and ends at the beginning of the ventricular contraction. | ||
[[Image:QRSwaves.jpg|thumb]] | [[Image:QRSwaves.jpg|thumb]] | ||
The PQ | The PQ interval indicates how fast the action potential is transmitted through the AV node (atrioventricular) from the atria to the ventricles. Measurement should start at the beginning of the P wave to the beginning of the QRS segment. | ||
'''The normal PQ is between 0.12 and 0.20 seconds'''. | '''The normal PQ interval is between 0.12 and 0.20 seconds'''. | ||
A prolonged PQ | A prolonged PQ interval is a sign of a degradation of the conduction system. This is called [[Arrhythmias #AV-block|1st, 2nd or 3rd degree AV block]]. | ||
A short PQ | A short PQ interval can be seen in the [[Arrhythmias#WPW|WPW syndrome]] in which a faster connection exists between the atria and the ventricles. | ||
{{clr}} | {{clr}} | ||