The experience of trauma causes neurochemical changes in the brain that play a role in encoding fear memories that are implicated in Post Traumatic Stress Disorder. The nurse identifies the involvement of which neurotransmitters?

Choice A reason: In PTSD, glutamate drives excitatory signaling in the amygdala, enhancing fear memory consolidation, while norepinephrine heightens arousal via locus coeruleus activation, strengthening traumatic memory encoding. This hyperactive glutamatergic-noradrenergic interaction sustains fear responses, contributing to PTSD’s persistent hyperarousal and intrusive memories. Choice B reason: GABA inhibits neural activity, counteracting excitation, but its role in PTSD is secondary, modulating rather than driving fear memory formation. Glutamate is critical for memory consolidation in the amygdala, but pairing with GABA does not fully explain PTSD’s hyperarousal and fear encoding mechanisms. Choice C reason: Histamine regulates wakefulness and arousal but is not directly involved in PTSD’s fear memory encoding. GABA modulates inhibition but does not drive the excitatory processes in the amygdala critical for trauma-related memory consolidation, making this pair irrelevant to PTSD’s core neurochemistry. Choice D reason: Acetylcholine modulates attention and memory but is not a primary driver of PTSD’s fear responses. Serotonin influences mood but plays a secondary role in trauma memory encoding compared to glutamate and norepinephrine, which directly mediate amygdala hyperactivity in PTSD.