Memory Performance in Iranian Veterans with and without Post-Traumatic Stress Disorder

Introduction

  • The study compares memory performance between Iranian veterans with and without Post-Traumatic Stress Disorder (PTSD), emphasizing the condition's impact on cognitive functions.

  • It underscores the importance of mental and physical well-being in war veterans, who are susceptible to psychological problems like PTSD due to traumatic exposures.

  • PTSD is initiated by stressful or traumatic events, resulting in adverse emotional experiences that significantly affect a person's cognitive system, particularly memory processes such as encoding, storage, and retrieval.

  • The eight-year war between Iran and Iraq led to many veterans and soldiers suffering from PTSD, leading to psychological conflicts, impacting their memory and ability to recall important information.

  • Studies indicate that individuals with psychological conflicts, especially those with PTSD, experience impaired memory and ability to retrieve information, further complicating their daily functioning and quality of life.

Methods

  • This study employed a retrospective cohort design, implemented between 2016 and 2017 to assess long-term effects of PTSD on memory.

  • The participant pool included 30 veterans diagnosed with PTSD and 30 veterans without PTSD to ensure a balanced comparative analysis.

  • PTSD diagnosis was confirmed by a psychiatrist and validated by the medical commission of the Veterans Affairs and Martyr Foundation, ensuring diagnostic accuracy.

  • A purposive sampling method was employed, focusing on specific inclusion criteria to reduce variability and enhance result validity.

  • Data collection was conducted using the Wechsler Memory Scale (WMS), a comprehensive tool for evaluating different aspects of memory function.

  • Data analysis was performed using multivariate analysis of variance (MANOVA) to identify significant memory differences between the groups.

Results

  • Significant differences were observed between the two groups in all WMS subscales, including:

    • General information: Ability to recall common facts.

    • Orientation: Awareness of time, place, and personal identity.

    • Mental control: Ability to perform mental tasks under pressure.

    • Logical memory: Ability to remember and recall stories.

    • Digit span: Ability to remember and repeat a series of numbers.

    • Visual memory: Ability to remember and reproduce visual stimuli.

    • Associate learning: Ability to learn and recall paired associations.

  • Veterans with PTSD consistently scored lower across all memory subscales compared to their counterparts without PTSD, indicating a broad impairment of memory functions.

Discussion

  • The study confirms that memory performance varies significantly between Iranian veterans with and without PTSD based on the WMS subscales.

  • It highlights that veterans with PTSD do not have the same level of memory function as those without PTSD, even after many years post-service, indicating long-term effects of PTSD on cognitive functions.

  • A notable limitation was the lack of comprehensive pre-war information about the veterans, which prevents a fully detailed examination of their memory before the onset of PTSD.

Ethical Considerations

  • The research adhered to ethical guidelines, including those from the American Psychological Association (APA), ensuring respect for intellectual property rights and proper acknowledgement of contributors.

  • The project received crucial support from the Islamic Azad University, Garmsar Branch, which facilitated the research process.

  • The authors explicitly declared no conflicts of interest, ensuring the objectivity and integrity of the study.

Introduction Section Details:

  • The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) classifies trauma and stress-related disorders, which include reactive attachment disorder, disinhibited social engagement disorder, post-traumatic stress disorder, acute stress disorder, and adjustment disorders. This classification aids in proper diagnosis and treatment planning.

  • A shared feature in these disorders is exposure to a stressful or traumatic event, which is a critical diagnostic criterion, emphasizing the importance of trauma in the development of these conditions.

  • The primary characteristic of PTSD involves experiencing a traumatic or stressful event, which leads to persistent stress lasting over a month, highlighted by symptoms such as:

    • Re-experiencing intrusive memories: Involuntary and distressing recollections of the event.

    • Painful dreams: Nightmares that replay or symbolize the traumatic experience.

    • Dissociative reactions: Feeling detached from one’s body or emotions.

    • Flashbacks: Vivid re-experiencing of the traumatic event as if it were happening again.

    • Intense distress and physiological responses to reminders: Strong emotional and physical reactions to cues that symbolize or resemble the trauma.

    • Persistent avoidance of memories, thoughts, or feelings associated with the traumatic event: Efforts to avoid triggers that might evoke memories of the trauma.

    • Avoidance of external stimuli: Steering clear of places, people, or situations that remind the individual of the traumatic event.

    • Changes in cognition and mood: Negative alterations in thinking and emotional state.

    • Cognitive distortions and negative emotional states: Distorted beliefs about oneself and the world, accompanied by persistent negative emotions.

    • Hypervigilance or increased arousal: Heightened state of alertness and reactivity.

    • Sleep problems: Difficulty falling asleep or staying asleep.

    • Concentration problems: Trouble focusing or maintaining attention.

    • Self-destructive behavior: Actions that are harmful to oneself, reflecting underlying distress.

  • The clinical progression of PTSD is unpredictable, often lasting months or years, significantly impacting an individual's cognitive system, with marked effects on memory and daily functioning.

  • Emotion and cognition are integral to psychological organization, and when either is impaired, it can substantially affect the other, leading to complex psychological disturbances.

  • The imposed war in Iran has resulted in a large number of veterans and residents experiencing PTSD symptoms, highlighting the widespread psychological impact of war on the population.

  • Studies, such as those by Safaei et al., have shown that a notable percentage of veterans in Tehran exhibit PTSD symptoms, further stressing the urgent need for mental health support.

  • Emotional experiences can disrupt an individual's cognitive system, especially memory, causing significant functional impairment.

  • War-related stresses often trigger nervous pressures and psychological conflicts, directly affecting memory processes and overall cognitive efficiency.

  • Psychologists differentiate three primary aspects of memory:

    • Memory stages: encoding, storage, and retrieval, each playing a crucial role in memory function.

    • Long-term or short-term storage: Differing in duration and capacity.

    • Maintenance of information types: Including declarative (facts) and procedural (skills) memory.

  • The influence of stress on cognitive function is linked to hormonal structures and related brain centers, involving complex neurobiological interactions.

  • Cortisol, a key stress hormone, has a dual function, either facilitating or inhibiting memory depending on the context and duration of the stressor.

  • Under stressful conditions, attention narrows and focus intensifies, impairing encoding, memory maintenance, and information retrieval processes.

  • The memory content of individuals with post-trauma disorders is often specific to the disorder, resulting in impaired information retrieval, especially concerning trauma-related memories.

  • Psychological effects of war injuries can influence neuropsychological components like memory in individuals with PTSD, leading to persistent cognitive deficits.

  • Long-term effects of war-related stresses on memory are still understudied, calling for comprehensive research to understand these chronic impacts.

  • The current research aims to thoroughly investigate and compare the memory performance of veterans with and without PTSD, filling a crucial gap in understanding.

Methods Section Extended:

  • This study was a historical cohort study conducted between 2016 and 2017, which allowed for the examination of long-term effects of PTSD on memory.

  • Participants included veterans with and without PTSD who had records in the Foundation of Martyrs and Veterans Affairs, which provided a reliable source for patient data.

  • Diagnostic criteria for PTSD were based on the medical commission's documentation at the Foundation, which ensured the diagnoses were clinically validated.

  • Exclusion criteria included non-Iranian nationality, unwillingness to participate, and presence of comorbid disorders such as depression, bipolar disorder, or psychosis, which aimed to isolate the effects of PTSD on memory functioning.

  • The Wechsler Clinical Memory Scale was used to gather data on memory function comprehensively, covering various aspects of memory.

  • Statistical analysis involved descriptive statistics and multivariate analysis of variance (MANOVA), providing insights into the significant differences between the groups.

Results Section Extended:

  • The study found significant differences between the two groups in all subscales of the Wechsler Clinical Memory Scale, including:

    • General information: Basic knowledge recall.

    • Orientation to time and place: Awareness of current surroundings.

    • Mental control: Ability to perform cognitive tasks under stress.

    • Auditory memory: Recall of verbal information.

    • Numerical memory: Retention and manipulation of numbers.

    • Visual drawing: Memory for visual patterns.

    • Word association: Ability to pair and remember related words.

  • Veterans with PTSD showed lower scores in memory subscales compared to those without PTSD, indicating a significant memory deficit.

Discussion Section Extended:

  • The health of veterans requires attention to their psychological problems, and memory function is crucial to their quality of life, as it affects daily functioning and overall well-being.

  • The study demonstrated that veterans with PTSD have impaired memory function compared to those without PTSD, affirming the lasting cognitive effects of PTSD.

  • Experienced stresses from the war have long-lasting effects, despite the passage of time and treatments received, emphasizing the chronic nature of PTSD.

  • The findings suggest that veterans with PTSD may use cognitive strategies to avoid accessing details of painful war experiences, which can further impair their memory recall.

  • Veterans with PTSD showed lower performance in word association and auditory memory, which can negatively affect their linguistic interactions and analytical abilities, impairing communication and cognitive processing.

  • Veterans with PTSD had poorer control and management of their traumatic memories, contributing to intrusive thoughts and emotional distress.

  • The study highlights the persistence of traumatic experiences in veterans' memories and their impact on overall memory and recall, reinforcing the need for targeted interventions.

Conclusion

  • The study concluded that the effects of PTSD persist in veterans, affecting their memory functions compared to veterans without the disorder, even years after the traumatic events.

Limitations

  • Limitations of the study included the lack of full matching of the two veteran groups, preventing a fully controlled comparison.

  • The lack of access to pre-injury information made it challenging to fully assess baseline memory function before the onset of PTSD.

  • There was also a lack of a comprehensive assessment of memory and other neuropsychological evaluations, further limiting the scope of the findings.

Implications

  • The study's findings can be used to improve services and rehabilitation for veterans and others suffering from PTSD, informing the development of more effective treatments.

Ethics

  • The study was approved by the research council of Islamic Azad University, Garmsar Branch, ensuring ethical standards were met throughout the research process.

Funding

  • No financial support was received from any public, commercial, or non-profit organizations, indicating the study was conducted independently.

Conflict of Interest

  • The authors declared no conflict of interest, ensuring the integrity and objectivity of the research.

Acknowledgements

  • The authors express gratitude to all veterans and officials of the Martyr Foundation who collaborated with this research, acknowledging their valuable contributions.