Abstract
The normal PR (PQ) interval exceeds 0.12 s and encompasses the delay in cardiac conduction from the right atrium in the area of the sinoatrial node to the point of earliest activation of the ventricles. Up to 2% of normal persons have PR intervals from 0.10 to 0.12 s[1] and represent one end of the normal distribution. The measurement of the true PR interval is subject to an error of ±0.02 s at the usual paper speed of 25 mm/s used for routine electrocardiography using a single-channel electrocardiogram for measurement [2]. Rarely a short PR interval may be observed during isorhythmic AV dissociation [3] and in a variety of rare lysosomal storage diseases where it is believed to result from infiltration of individual AV nodal fibers with substrate [4–7]. It has been described in hyperthyroidism, anxiety neurosis, hypertension, and several other conditions where there appears to be a common underlying mechanism of increased sympathetic tone or circulating catecholamines [1].
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© 1981 Martinus Nijhoff Publishers, The Hague
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Kennelly, B.M. (1981). The Short PR Interval. In: Wellens, H.J.J., Kulbertus, H.E. (eds) What’s New in Electrocardiography. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-8239-0_10
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DOI: https://doi.org/10.1007/978-94-009-8239-0_10
Publisher Name: Springer, Dordrecht
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