Diagnostic Utility of Sodium Lactate Infusion and CO2-35% Inhalation for Panic Disorder.
Level 5 - mechanism / opinion, no new human data
Narrative review of diagnostic challenge studies without systematic meta-analysis.
PubMed 30982042 · doi:10.1159/000499136
What was done
The authors reviewed literature evaluating sodium lactate infusion and 35% carbon dioxide (CO2) inhalation as laboratory diagnostic challenge tests for panic disorder. A three-step framework for identifying diagnostic tests was applied to studies assessing panic induction in panic disorder patients, healthy controls, and individuals with other psychiatric conditions.
What was found
The abstract reports no numerical data, sensitivities, or specificities. Qualitatively, participants with panic disorder were more likely to experience panic attacks after receiving sodium lactate or 35% CO2 than controls. Most reviewed studies compared panic disorder patients exclusively to healthy controls rather than psychiatric comparison groups.
Why it matters
While chemical challenge tests reliably elicit panic in panic disorder, their clinical diagnostic utility remains unproven until specificity across other psychiatric disorders is established.
Limits
The abstract provides no study counts, participant numbers, or quantitative effect sizes. The literature base is limited by a reliance on healthy control comparisons, leaving diagnostic specificity and potential transdiagnostic overlap unmeasured.
Cited by
- contradicts Inhaling carbon dioxide triggers a panic attack in approximately 50 percent of the general population.