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Conduction: Difference between revisions
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[[Image:QRSwaves.jpg|thumb|300px|right]] | [[Image:QRSwaves.jpg|thumb|300px|right]] | ||
==The PQ interval== | ==The PQ interval== | ||
'''The PQ interval starts at the beginning of the atrial contraction and ends at the beginning of the ventricular contraction.''' | |||
[[Image:PR_interval_buildup.svg|thumb|The PR duration depends on the conduction velocity in the atria, AV node, His bundle, bundle branches and Purkinje fibers.]] | [[Image:PR_interval_buildup.svg|thumb|The PR duration depends on the conduction velocity in the atria, AV node, His bundle, bundle branches and Purkinje fibers.]] | ||
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==The QRS duration== | ==The QRS duration== | ||
'''The QRS duration indicates how fast the ventricles depolarize.''' | |||
The ventricles depolarize normally within 0.10 seconds. When this is longer than 0.12 seconds, this is a [[conduction delay| conduction delay]]. Possible causes of a QRS duration > 0.12 seconds include: | The ventricles depolarize normally within 0.10 seconds. When this is longer than 0.12 seconds, this is a [[conduction delay| conduction delay]]. Possible causes of a QRS duration > 0.12 seconds include: | ||