Olfactory Function and Delayed Neurocognitive Recovery

Patients in intervention group will get odor enrichment during perioperative period (3 days before the surgery and 7 days after the surgery). Odor-enriched participants were exposed daily for 24 hours to different aromatic fragrances (phenyl ethyl alcohol - rose; eucalyptol - eucalyptus; citronellal - lemon; eugenol - cloves) referred to previous studies. Odors were changed for each subject after 24 hours. According to previous studies, 10 drops of the 100% essential oil (0.5 ml) were dropped on a fabric which was placed in tea bags hanging at the hospital bedside.