Exploring the Refractory Period of an Active Stand in Females With Initial Orthostatic Hypotension

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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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...  

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Vol 156 (6) ◽  
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Anthony J. Ocon ◽  
Julian M. Stewart

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