Lactate provocation of panic attacks in depressed outpatients

Area of Science:

• Psychiatry
• Clinical Psychology
• Neuroscience

Background:

• Panic attacks are a core feature of panic disorder.
• Depression and panic disorder frequently co-occur.
• The physiological mechanisms linking panic and depression require further elucidation.

Purpose of the Study:

• To investigate the relationship between a history of panic attacks and the induction of panic symptoms via sodium lactate infusion in depressed patients.
• To determine if lactate-induced panic is associated with the frequency of spontaneous panic attacks.

Main Methods:

• Forty-seven outpatients diagnosed with nonmelancholic depression were administered intravenous sodium lactate.
• Participants' responses, specifically panic attacks, were assessed by raters unaware of their panic history.
• Statistical analysis compared panic rates between patients with and without a history of panic attacks.

Main Results:

• A significantly higher proportion of patients with a history of panic attacks (52%) experienced lactate-induced panic compared to those without (6%).
• The frequency of spontaneous panic attacks positively correlated with the likelihood of experiencing lactate-induced panic.
• Lactate infusion served as a reliable trigger for panic in susceptible individuals.

Conclusions:

• A history of panic attacks strongly predicts a positive response to sodium lactate challenge.
• Findings suggest a potential shared biological vulnerability or mechanism between panic disorder and depression.
• Further research is warranted to explore the neurobiological underpinnings of panic and its comorbidity with depression.