Normal autonomic neurophysiology of postural orthostatic tachycardia and recommended physiological assessments in postural orthostatic tachycardia syndrome.

Physiol Rep · 2020 · PMC7318787 · PMID 32588974

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markedly significantno p-value reported

There is a markedly significant rise of heart rate to a level that is 63% above the supine baseline level, which is an increase of 40 beats/min.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.