Three years ago, the nurse's parent died in an intensive care unit (ICU). The nurse is caring for a client in the ICU with the same diagnosis and similar features to the nurse's parent. Which manifestation of posttraumatic stress disorder (PTSD) did the nurse likely experience when feeling a sense of panic confronting the client?

Choice A reason: Derealization, a dissociative symptom in PTSD, involves feeling detached from reality, linked to altered prefrontal cortex and limbic system activity. Panic from a similar ICU case suggests a triggered memory, not detachment. Derealization is less likely, as the nurse’s response aligns with reliving a traumatic event, not perceptual distortion. Choice B reason: Hyperarousal in PTSD involves heightened alertness and exaggerated startle, driven by amygdala hyperactivity and elevated norepinephrine. While panic suggests arousal, the trigger of a similar ICU case points to reliving a specific traumatic memory, making flashback more precise than general hyperarousal, which lacks the event-specific re-experiencing component. Choice C reason: A flashback in PTSD involves reliving a traumatic event, triggered by cues like a similar ICU case, due to amygdala-driven memory reactivation and hippocampal dysfunction. The nurse’s panic reflects re-experiencing the parent’s death, a hallmark of PTSD, where sensory cues vividly recall trauma, causing intense emotional distress. Choice D reason: Emotional numbing in PTSD involves reduced emotional responsiveness, linked to prefrontal cortex suppression. Panic from a similar ICU case indicates an active emotional response, not numbing. The nurse’s reaction aligns with re-experiencing trauma via a flashback, driven by amygdala activation, rather than emotional detachment.