Brain fog in postural tachycardia syndrome: An objective cerebral blood flow and neurocognitive analysis.

Background: It remains unclear whether brain fog is related to impaired cerebral blood flow (CBF) in postural tachycardia syndrome (POTS) patients.

Methods: We assessed CBF in the posterior cerebral artery (PCA) using transcranial Doppler with visual stimuli in 11 POTS and 8 healthy subjects in the seated position, followed by neurocognitive testing.

Results: CBF parameters were similar between the two groups.