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Neopterin and mini-mental state examination scores in delirium: New insights?

Sir, We have read with great interest the article by Miao et al., in which neopterin levels and mini‐mental state examination (MMSE) scores were investigated in older patients with and without delirium after elective gastrointestinal tumor resection. The findings of the study suggest that patients with delirium have higher preoperative neopterin levels and lower MMSE scores than patients without delirium.