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• W2557232966 abstract "We previously showed that one-third of adolescents with postural orthostatic tachycardia syndrome (POTS) have hyperkinetic circulation. In a subsequent cohort, we compare participants with POTS grouped according to cardiac output () versus oxygen uptake () function, whose circulatory response to exercise lay at the lower end of this distribution. We hypothesized that such grouping determines the circulatory response to incremental-protocol, upright, cycle ergometry by whatever blend of flow and resistance adjustments best maintains normal blood pressure. We reviewed data on 209 POTS participants aged 10–19 years (73% female) grouped as follows: < 3.20 L·min−1 per L·min−1 were designated low or hypokinetic variant (N = 31); normal- had slopes between 3.21 and 7.97; hyperkinetic participants had slope >8 L·min−1 per L·min−1 (N = 32). Heart rate response to exercise was virtually identical in each group. Mean stroke volume (SV) rose normally in the hyperkinetic group (51 ± 38%); less in the normal group (22 ± 27%); but was flat in the low group (−7 ± 16%). Mean arterial pressure was similar at rest while systemic vascular conductance was flat from rest to exercise in the hypokinetic group, and by comparison rose more steeply in the normal (P < 0.001) and in the hyperkinetic (P = 0.02) groups. In conclusion, we identified a variant of POTS with a hypokinetic circulation maintained by a vasoconstricted state. We speculate that they cannot muster preload to augment exercise SV due to profound thoracic hypovolemia, and must resort to vasoconstriction in order to maintain perfusion pressure within working muscle." @default.
• W2557232966 created "2016-11-30" @default.
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• W2557232966 date "2016-11-01" @default.
• W2557232966 modified "2023-09-26" @default.
• W2557232966 title "Cardiac responses to exercise distinguish postural orthostatic tachycardia syndrome variants" @default.
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• W2557232966 doi "https://doi.org/10.14814/phy2.13040" @default.
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