Sodium lactate infusion, panic attacks, and ionized calcium.

Area of Science:

• Neuroscience
• Psychiatry
• Calcium Metabolism

Background:

• Sodium lactate is known to induce panic attacks in susceptible individuals.
• The exact mechanism behind sodium lactate-induced panic attacks remains unclear.
• A previous hypothesis suggested peripheral hypocalcemia as the cause.

Purpose of the Study:

• To investigate the relationship between sodium lactate infusion and ionized calcium levels.
• To determine if changes in ionized calcium correlate with panic attack precipitation.
• To test the hypocalcemia hypothesis in panic disorder patients.

Main Methods:

• Serial ionized calcium measurements were taken during intravenous sodium lactate infusions.
• Participants included panic disorder patients who experienced panic attacks during infusion (n=22), those who did not (n=11), and healthy controls (n=6).

Main Results:

• Intravenous sodium lactate infusion caused a significant decrease in ionized calcium across all participant groups.
• No correlation was found between the rate or extent of ionized calcium decrease and the occurrence of panic attacks during infusion.

Conclusions:

• While sodium lactate infusion lowers ionized calcium, this effect does not appear to be the direct cause of panic attacks.
• The mechanism by which sodium lactate precipitates panic attacks requires further investigation.
• The hypocalcemia hypothesis for sodium lactate-induced panic is not supported by this study's findings.