Assessment of cardiac autonomic modulation during graded head-up tilt by symbolic analysis of heart rate variability.

@article{Porta2007AssessmentOC,
  title={Assessment of cardiac autonomic modulation during graded head-up tilt by symbolic analysis of heart rate variability.},
  author={Alberto Porta and Eleonora Tobaldini and Stefano Guzzetti and Raffaello Furlan and N. Montano and Tomaso Gnecchi-Ruscone},
  journal={American journal of physiology. Heart and circulatory physiology},
  year={2007},
  volume={293 1},
  pages={H702-8}
}
Two symbolic indexes, the percentage of sequences characterized by three heart periods with no significant variations (0V%) and that with two significant unlike variations (2UV%), have been found to reflect changes in sympathetic and vagal modulations, respectively. We tested the hypothesis that symbolic indexes may track the gradual shift of the cardiac autonomic modulation during an incremental head-up tilt test. Symbolic analysis was carried out over heart period variability series (250… CONTINUE READING

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