Long-chain polyunsaturated fatty acid lipid and oxylipin alterations in postoperative delirium after cardiac surgery.

Lipids play a crucial role in signaling, membrane dynamics, and inflammatory regulation, yet their involvement in postoperative delirium pathogenesis remains unclear. This study examined serum lipidomic alterations in postoperative delirium and assessed the effects of dexmedetomidine treatment on these changes. Lipidomic profiling was conducted at baseline and postoperative day 1 in two independent cohorts of cardiac surgery patients. Mass spectrometry-based shotgun lipidomics and targeted lipid analyses were used to assess lipidomes and oxylipins, respectively. Cardiac surgery was associated with decreased serum lysophospholipids. Postoperative delirium was associated with increased long-chain polyunsaturated fatty acid phospholipids, particularly phosphatidylethanolamines, and elevated oxylipins. Dexmedetomidine, a potential delirium-mitigating medication, reduced long-chain polyunsaturated fatty acid phospholipids. These findings highlight lipid modulation as a potential target for postoperative delirium prevention.