Autonomic reactivity and hormonal secretion in lactate-induced panic attacks

Area of Science:

• Neuroendocrinology
• Autonomic Nervous System Physiology
• Psychiatry

Background:

• Panic attacks involve complex autonomic and neuroendocrine changes.
• Lactate infusion is a known method for inducing panic-like symptoms in susceptible individuals.
• The role of hormones like atrial natriuretic hormone (ANH) in panic pathophysiology requires further elucidation.

Purpose of the Study:

• To compare autonomic and neuroendocrine responses during lactate-induced panic attacks.
• To investigate the relationship between heart rate variability, cortisol, and ANH levels in panic patients versus controls.

Main Methods:

• Randomized, double-blind, placebo-controlled study.
• Lactate or saline infusion administered to panic patients and healthy controls.
• Measurements included spectral analysis of heart rate variability (HRV) and plasma levels of cortisol and ANH.

Main Results:

• Lactate infusion accelerated heart rate and reduced overall HRV spectral power in both groups.
• Panic patients showed increased high-frequency HRV power and significantly elevated ANH levels post-infusion.
• Non-panickers exhibited a shift in HRV power distribution; cortisol levels remained unaffected in both groups.

Conclusions:

• Lactate-induced panic attacks are associated with increased ANH release.
• ANH may play a role in attenuating sympathetic activity and cortisol secretion during panic attacks.
• These findings may help explain the dissociation between psychological and physiological responses in panic disorder.