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Verbal memory functioning moderates psychotherapy treatment response for PTSD-Related nightmares
J Cobb Scott1, Gerlinde Harb2, Janeese A Brownlow1
1VISN4 Mental Illness Research, Education, and Clinical Center, Corporal Michael J. Crescenz VA Medical Center, 3900 Woodland Ave, Philadelphia, PA 19104, USA; Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, 3400 Spruce St, 10 Gates, Philadelphia, PA 19104, USA.
Cognitive behavioral therapy (CBT) for posttraumatic stress disorder (PTSD) sleep issues may be less effective for individuals with poor verbal memory. Traumatic brain injury (TBI) impacts symptoms but not treatment response trajectories.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Posttraumatic stress disorder (PTSD) is linked to cognitive impairments affecting attention, executive function, and memory.
- The impact of these cognitive deficits on treatment outcomes for PTSD is not well understood.
- Sleep disturbances, including nightmares, are common in PTSD and often targeted by treatments like cognitive-behavioral therapy for insomnia (CBT-I).
Purpose of the Study:
- To investigate the association between cognitive functioning, history of traumatic brain injury (TBI), and treatment response to CBT for PTSD-related sleep problems.
- To determine if cognitive deficits predict differential outcomes in interventions for recurrent nightmares in veterans with PTSD.
Main Methods:
- A randomized controlled trial comparing Imagery Rehearsal plus components of CBT for Insomnia (IR + cCBT-I) to cCBT-I alone for PTSD-related nightmares.
- 94 U.S. veterans with PTSD completed cognitive tests and a structured clinical interview for TBI history.
- Mixed-effects models analyzed cognitive functioning and TBI effects on sleep and nightmare outcomes over time.
Main Results:
- Significant interactions between verbal immediate memory and time were observed for nightmare distress, frequency, and sleep quality, indicating poorer response in those with lower verbal memory.
- These memory effects persisted even after controlling for overall cognitive performance and depression.
- Traumatic brain injury (TBI) showed main effects on outcomes, but no interaction with time, suggesting TBI influences symptom severity but not the trajectory of treatment response.
Conclusions:
- Lower verbal memory performance is associated with a reduced likelihood of responding to sleep interventions for PTSD.
- While TBI affects PTSD symptom severity, it does not appear to alter the course of treatment response in these interventions.
- Verbal memory functioning is a critical factor to consider when implementing and tailoring PTSD treatments.
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