Changes in thinking and memory after heart bypass surgery and how they happen

Patients undergoing coronary artery bypass grafting (CABG) with cardiopulmonary bypass (CPB) exhibited more severe neuropsychologic deficits than those undergoing off-pump CABG.

• Patients in the CPB group were more anxious and had higher rates of postoperative depression compared to the OPCAB group.
• Both groups demonstrated increased depression levels postoperatively, with some recovery observed by three months after surgery.
• Depression and anxiety were linked to various cognitive dysfunction factors in both patient groups.
• Only 2 patients in the CPB group and 6 in the OPCAB group showed a circadian rhythm of melatonin secretion in the first 24 postoperative hours.
• Cortisol secretion exhibited a circadian rhythm in 3 patients from the CPB group and 7 from the OPCAB group.
• Disordered circadian rhythms of melatonin and cortisol secretion may correlate with neuropsychological deficits, influenced by mood.

Simplified