Increased vasoconstriction predisposes to hyperpnea and postural faint.

@article{Taneja2008IncreasedVP,
  title={Increased vasoconstriction predisposes to hyperpnea and postural faint.},
  author={Indu Taneja and Marvin S. Medow and June L Glover and Neeraj K Raghunath and Julian M. Stewart},
  journal={American journal of physiology. Heart and circulatory physiology},
  year={2008},
  volume={295 1},
  pages={H372-81}
}
Our prior studies indicated that postural fainting relates to splanchnic hypervolemia and thoracic hypovolemia during orthostasis. We hypothesized that thoracic hypovolemia causes excessive sympathetic activation, increased respiratory tidal volume, and fainting involving the pulmonary stretch reflex. We studied 18 patients 13-21 yr old, 11 who fainted within 10 min of upright tilt (fainters) and 7 healthy control subjects. We measured continuous blood pressure and heart rate, respiration by… CONTINUE READING

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