Rajeev, D. A., Paul, D. G., S, D. S. K., & Vijayakumar, D. P. (2018). The study of incidence of post operative delirium in geriatric patients who needed prolonged ICU stay after undergoing a major cardiac surgery in a tertiary care hospital. International Journal of Medical Science and Clinical Invention, 5(2), 3504–3506. https://doi.org/10.18535/ijmsci/v5i2.02