CHRNA7 and delirium: The results revealed that the keywords could be divided into nine main clusters (Q value = 0.7442, S value = 0.8881) (Figure 11C): #0 dexmetomidine, #1 NLRP3 inflammasome, #2 cognitive impairment, #3 impairment, #4 postoperative cognitive dysfunction, #5 cognitive function, #6 delirium, #7 perioperative neurocognitive dysfunction, and #8 α7‐nAChR.