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Related Experiment Videos

Hypertonic saline infusion increases plasma norepinephrine concentrations in normal men

E R Peskind1, A Radant, D J Dobie

  • 1Geriatric Research, Education, and Clinical Center, Seattle, Washington.

Psychoneuroendocrinology
|January 1, 1993
PubMed
Summary

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Hypertonic saline infusion significantly increases sympathetic nervous system activity in healthy men, elevating plasma norepinephrine and mean arterial pressure. This suggests a potential role for the sympathetic system in anxiety responses.

Area of Science:

  • Neuroendocrinology
  • Autonomic Nervous System Research
  • Human Physiology

Background:

  • Hypertonic saline infusion is known to induce panic in patients with panic disorder.
  • The neuroendocrine and autonomic effects of hypertonic saline in healthy individuals are not fully understood.

Purpose of the Study:

  • To investigate the effects of hypertonic saline infusion on neuroendocrine systems in normal men.
  • To assess the impact on sympathetic nervous system activity and related physiological markers.

Main Methods:

  • Administered a 150-minute infusion of hypertonic saline (5% sodium chloride) to healthy male participants.
  • Measured plasma osmolality, arginine vasopressin (AVP), norepinephrine (NE), epinephrine, cortisol, and adrenocorticotrophic hormone (ACTH).
  • Compared responses to a normal saline infusion of equal volume and duration.

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Main Results:

  • Hypertonic saline increased plasma osmolality and arginine vasopressin (AVP) levels.
  • Plasma norepinephrine (NE) and mean arterial pressure (MAP) significantly increased during hypertonic saline infusion.
  • Positive correlations were observed between MAP and NE, but not between MAP and AVP.

Conclusions:

  • Hypertonic saline infusion activates the sympathetic nervous system in healthy men.
  • The findings suggest that increased sympathetic activity may be a key physiological response to hypertonic saline.
  • This research provides insights into the neuroendocrine mechanisms potentially involved in anxiety and panic.