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Pulmonary and systemic nitric oxide measurements during CCK-5-induced panic attacks
Nathalie Lara1, Wendy E Chrapko, Stephen L Archer
1Department of Psychiatry, University of Alberta, Canada. jean-michel.lemelledo@ualberta.ca
Summary
Panic attacks (PAs) cause a decrease in exhaled nitric oxide (NO) due to hyperventilation, not altered lung NO production. This study examined NO levels during induced panic attacks in healthy volunteers.
Area of Science:
- Cardiopulmonary physiology
- Neuroscience
- Medical research
Background:
- Nitric oxide (NO) is crucial for cardiopulmonary regulation, with dysregulation linked to various illnesses.
- Panic disorder (PD) has been associated with increased cardiovascular and pulmonary disease risk.
- The role of NO in acute anxiety states like panic attacks (PAs) remains unclear.
Purpose of the Study:
- To investigate alterations in pulmonary and systemic nitric oxide (NO) production during experimentally induced panic attacks (PAs).
- To explore the relationship between NO measurements and physiological changes during PAs.
Main Methods:
- A double-blind, placebo-controlled, crossover study design was employed.
- Seventeen healthy volunteers (HVs) received either pentagastrin (a PA-inducing agent) or placebo.
- Exhaled NO concentrations and NO metabolites were measured using chemiluminescence during induced PAs.
Main Results:
- Pentagastrin successfully induced PAs in HVs.
- A significant decrease in exhaled NO plateau concentrations was observed during induced PAs.
- This decrease correlated with a proportional increase in minute ventilation.
- No significant changes in overall pulmonary or systemic NO production were detected.
Conclusions:
- The observed reduction in exhaled NO during induced panic attacks is primarily attributed to hyperventilation.
- This finding suggests that altered NO production in the lungs is not a direct consequence of panic attacks.
- This research provides novel insights into NO dynamics during acute anxiety episodes.