A 62-Year-Old Man With Confusion, Lethargy, and Nausea Nameera Temkar, MD

https://reference.medscape.com/viewarticle/62-year-old-man-confusion-lethargy-and-nausea-2026a1000oqc?_gl=1*euejow*_gcl_aw*R0NMLjE3ODM4NzAxMzguQ2p3S0NBanc5c3pTQmhCTkVpd0FDNTdTcTJZUXZTZkkxc01raEZQZ1VLSWRQZkVUdGU4U212WEI0NGh3aEE5WmMtVDhTSVBEWlBzNmdSb0NiT1FRQXZEX0J3RQ..*_gcl_au*NjkzMDY5MjIxLjE3ODA2NzA2MDAuNzg2NzA1NjA2LjE3ODU0OTg4NTIuMTc4NTQ5OTEzOS4xNDk4MDEyNjM5LjE3ODU0OTg4NTIuMTc4NTQ5OTEzOQ.. A 62-year-old man presents to the emergency department with progressive lethargy, nausea, and difficulty concentrating. His wife reports he has been acting increasingly confused over the past 48 hours. He denies fever, chest pain, or seizures. The patient is a current smoker, having started at age 20 years, with a 40 pack-year history.