Maximizing the efficacy of interoceptive exposure by optimizing inhibitory learning: a randomized controlled trial.

Area of Science:

• Psychology
• Clinical Psychology
• Anxiety Disorders

Background:

• Cognitive-behavioral treatments for panic disorder (PD) often utilize interoceptive exposure (IE) to address anxiety sensitivity (AS).
• Existing protocols vary in IE delivery, potentially impacting treatment efficacy.

Purpose of the Study:

• To compare the efficacy of intensive IE versus low-dose IE in reducing AS and fear.
• To investigate the role of fear toleration and negative outcome expectancies in mediating treatment effects.

Main Methods:

• A randomized controlled trial with 120 participants with elevated AS.
• Four single-session interventions: low-dose IE (standard and modified), intensive IE, and an expressive writing control.
• Assessment of AS and fear response to a straw breathing task pre- and post-treatment, with follow-up.

Main Results:

• Intensive IE yielded significantly greater reductions in AS and fear compared to low-dose IE and control conditions.
• Fear sensitization occurred in low-intensity IE conditions.
• Treatment gains were maintained at follow-up across all conditions.

Conclusions:

• Intensive IE delivery appears more effective than low-dose IE for reducing AS and fear in PD.
• Enhanced fear toleration and reduced negative outcome expectancies mediate the benefits of intensive IE.
• Optimizing IE delivery is crucial for improving exposure-based PD treatments.