Postoperative cognitive dysfunction (POCD), the most common complications of geriatric surgical patients, could contribute to long-term social dysfunction, high mortality and increased medical cost. Previous studies have suggested that impaired Olfaction was related to postoperative delirium (Nadya M. Dhanani et al, J Clin Anesth 2012; Charles H. Brown IV et al, J Am Geriatr So 2015; Min Seung Kim et al, J Neural Transm 2016). However, there is still no efficient treatment for POCD, and it also remains largely unknown whether enhanced olfactory stimuli can be used as an inventive strategy to reduce the risk of POCD.
To study the correlation of POCD with olfactory function. To explore whether enhanced olfactory stimuli can reduce the risk of POCD as a preventive strategy.