Cerebrovascular reactivity to hypercapnia is unimpaired in breath-hold divers.

  title={Cerebrovascular reactivity to hypercapnia is unimpaired in breath-hold divers.},
  author={Vladimir Ivan{\vc}ev and Ivan Palada and Zoran Valic and Ante Obad and Darija Bakovic and Niki M. Dietz and Michael J. Joyner and Zeljko Dujic},
  journal={The Journal of physiology},
  volume={582 Pt 2},
Hypercapnic cerebrovascular reactivity is decreased in obstructive sleep apnoea and congestive heart disease perhaps as a result of repeated apnoeas. To test the hypothesis that repeated apnoeas blunt cerebrovascular reactivity to hypercapnia, we studied breath hold divers and determined cerebrovascular reactivity by measuring changes in middle cerebral artery velocity (MCAV, cm s(-1)) per mmHg change in end-tidal partial pressure of CO2(PET,CO2 ) in response to two hyperoxic hypercapnia… CONTINUE READING