Four-Symptom Model of Medical-Related Posttraumatic Stress Among Adult Cancer Patients

Objective: Four symptoms of posttraumatic stress (PTSS: intrusion, avoidance, alterations in arousal and reactivity, and negative alterations in cognitions and mood) were put forth by the Diagnostic and Statistical Manual of Mental Disorder (DSM-5). Patients with chronic major medical illness and their family caregivers often perceive the illness experience as traumatic, yet DSM-5 criteria precludes medical illness as a potential traumatic exposure. In this article, we address the applicability of the four symptoms to a medical population. Method: Adult patients with colorectal cancer (n = 130, M = 55.83 years old, 60.0% female, 46.9% Hispanic) and their family caregivers (n = 160, M = 51.01 years old, 72.5% female, 49.0% Hispanic) completed questionnaires around the time of cancer diagnosis and treatment initiation (Time 1 [T1]), and 1- (Time 2 [T2]) and 2- (Time 3 [T3]) year postdiagnosis. Intrusion, avoidance, and alterations in arousal and reactivity symptoms were assessed using the Impact of Events Scale-Revised and negative alterations in cognitions and mood were quantified with selected conceptually congruent items from various psychosocial measures. Results: Confirmatory factor analysis revealed good fit of the four-symptom model of PTSS for caregivers at all three times and for patients at T2. Factor loadings of the four symptoms were high, ranging from .47-.97 and .62-.96 among patients and caregivers, respectively. Conclusions: Findings extend the application of the four posttraumatic stress symptoms to patients with chronic major medical illness (cancer) and their family caregivers. Assessment and treatment of subclinical, yet substantial psychological distress precipitated by major medical illness like cancer are warranted.