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. Author manuscript; available in PMC: 2014 Jan 20.
Published in final edited form as: Expert Rev Cardiovasc Ther. 2012 Nov;10(11):1387–1399. doi: 10.1586/erc.12.139

Figure 1. Arterial pressure (upper panels) and cerebral blood flow velocity measured by transcranial Doppler ultrasound (lower panels).

Figure 1

The left panels show data from a vasovagal syncope patient, while the right panels show data from a POTS patient. Arterial pressure and CBFv are initially stable, then decrease gradually and finally abruptly decrease by >50% with loss of consciousness in the syncope patient. The POTS patient has no decrease in arterial pressure, but has a >20% reduction in CBF throughout tilt.

CBFv: Cerebral blood flow velocity; POTS: Postural tachycardia syndrome.