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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.''' | '''The PQ interval starts at the beginning of the atrial contraction and ends at the beginning of the ventricular contraction.''' | ||