Fluvoxamine reduces physiologic reactivity to trauma scripts in posttraumatic stress disorder

Area of Science:

• Psychiatry
• Clinical Psychology
• Neuroscience

Background:

• Posttraumatic stress disorder (PTSD) is characterized by significant psychological distress and physiological hyperarousal.
• Autonomic reactivity to trauma cues is a key feature differentiating individuals with PTSD from healthy controls.
• Understanding the physiological underpinnings of PTSD is crucial for developing effective treatments.

Purpose of the Study:

• To assess the efficacy of open-label fluvoxamine in treating PTSD, depressive symptoms, and physiological arousal.
• To investigate the relationship between physiological measures and PTSD severity.
• To determine if fluvoxamine treatment normalizes autonomic responses in patients with PTSD.

Main Methods:

• 16 patients with PTSD and 16 healthy controls underwent baseline psychometric and physiological assessments (heart rate, blood pressure) during trauma script exposure.
• Patients received open-label fluvoxamine (100-300 mg/day) for 10 weeks.
• Post-treatment assessments compared physiological and psychometric measures between groups.

Main Results:

• Patients with PTSD exhibited greater baseline autonomic reactivity compared to controls, correlating with PTSD severity.
• Systolic blood pressure and combined physiological variables effectively classified patients with PTSD.
• Fluvoxamine treatment led to significant improvements in PTSD, depression, and physiological reactivity, with medicated patients indistinguishable from controls.

Conclusions:

• Open-label fluvoxamine treatment demonstrates significant efficacy in reducing PTSD symptoms and normalizing autonomic reactivity.
• Physiological measures, particularly blood pressure, can serve as objective indicators of PTSD and treatment response.
• The dampening of autonomic arousal post-treatment supports the subjective improvements reported by patients receiving fluvoxamine.