Key result
Significant initial orthostatic hypotension (IOH) occurred in ~50% of patients with postural tachycardia syndrome (POTS) compared to 13% of controls.
Why the study?
What is the prevalence and clinical significance of initial orthostatic hypotension in patients with postural tachycardia syndrome compared to controls?
Observational
What is the prevalence and clinical significance of initial orthostatic hypotension in patients with postural tachycardia syndrome compared to controls?
Absolute Event Rate: 50% vs 13%
Although initial orthostatic hypotension is significantly more prevalent and severe in POTS patients than in controls, its presence alone is not sufficient to strongly predict a POTS diagnosis.
IOH is more prevalent in POTS yet nonspecific; leaves open whether integrated orthostatic metrics refine diagnosis in prospective studies.
Significant initial orthostatic hypotension (IOH) occurs in ~50% of postural tachycardia syndrome (POTS) patients and 13% of controls. Heart rate and blood pressure recovery are prolonged in IOH sustaining lightheadedness; IOH is more prevalent and severe in POTS. Altered cerebral blood flow and cardiorespiratory regulation are more prevalent in POTS. Altered heart rate variability and baroreflex gain may cause nearly instantaneous lightheadedness in POTS. IOH alone fails to confer a strong probability of POTS.
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Stewart et al. (2020) conducted an observational in Postural tachycardia syndrome (POTS). Postural tachycardia syndrome (POTS) vs. Controls was evaluated on Significant initial orthostatic hypotension (IOH). Significant initial orthostatic hypotension (IOH) occurred in ~50% of patients with postural tachycardia syndrome (POTS) compared to 13% of controls.
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