Which condition is least likely to present with altered mental status?

• A. drug overdose
• B. bacterial meningitis
• C. liver failure
• D. acute coronary syndrome

Answer: (D)

Altered mental status comes from conditions that directly affect brain function or brain blood flow. Drug overdose often depresses the brain, producing confusion or coma. Bacterial meningitis inflames the brain’s coverings and frequently causes confusion, lethargy, or delirium. Liver failure can lead to hepatic encephalopathy, where toxins aren’t cleared properly and brain function deteriorates.

Acute coronary syndrome is primarily a heart problem and typically presents with chest pain, shortness of breath, sweating, and nausea. While very severe ACS can progress to reduced brain perfusion in shock, altered mental status is not a common presenting feature. So, among these options, acute coronary syndrome is least likely to present with altered mental status.