Central nervous system dysfunction is commonly caused by which factors?

Central nervous system dysfunction is commonly caused by which factors?

• A. Head trauma, stroke, brain tumors, and various drugs
• B. Lower back pain and sciatica
• C. CNS dysfunction is only caused by infectious diseases
• D. Gastrointestinal disorders causing CNS depression

Answer: (A)

CNS dysfunction is most often the result of events that directly disrupt brain function or its blood supply, or alter brain chemistry. Head trauma can injure brain tissue and disrupt consciousness or specific functions; a stroke interrupts blood flow, causing sudden deficits; a brain tumor can press on or invade brain tissue, leading to progressive or focal problems; and exposure to or effects from various drugs can significantly depress or alter CNS activity. Together these factors capture the lines of multiple, direct ways the brain can lose function, which is why they represent the most common causes of CNS dysfunction. Lower back pain and sciatica involve the spinal cord nerves and surrounding structures but are not CNS dysfunction themselves. Infectious diseases can cause CNS problems, but they are not the exclusive or necessarily the most common causes. Gastrointestinal disorders causing CNS depression happen via metabolic effects and are not primary, direct causes of CNS dysfunction in the way trauma, stroke, tumors, or drugs are.

CNS dysfunction is most often the result of events that directly disrupt brain function or its blood supply, or alter brain chemistry. Head trauma can injure brain tissue and disrupt consciousness or specific functions; a stroke interrupts blood flow, causing sudden deficits; a brain tumor can press on or invade brain tissue, leading to progressive or focal problems; and exposure to or effects from various drugs can significantly depress or alter CNS activity. Together these factors capture the lines of multiple, direct ways the brain can lose function, which is why they represent the most common causes of CNS dysfunction.

Lower back pain and sciatica involve the spinal cord nerves and surrounding structures but are not CNS dysfunction themselves. Infectious diseases can cause CNS problems, but they are not the exclusive or necessarily the most common causes. Gastrointestinal disorders causing CNS depression happen via metabolic effects and are not primary, direct causes of CNS dysfunction in the way trauma, stroke, tumors, or drugs are.