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[[Image:QRSwaves.jpg|thumb|300px|right]] | [[Image:QRSwaves.jpg|thumb|300px|right]] | ||
==The PQ interval== | ==The PQ interval== | ||
[[Image: | [[Image:Conduction_ap.svg|thumb|300px|right|The PQ duration depends on the conduction velocity in the atria, AV node, His bundle, bundle branches and Purkinje fibers]] | ||
'''The PQ interval starts at the beginning of the atrial contraction and ends at the beginning of the ventricular contraction.''' | '''The PQ interval starts at the beginning of the atrial contraction and ends at the beginning of the ventricular contraction.''' | ||