Second-impact syndrome (SIS) is best described as?

Second-impact syndrome (SIS) is best described as?

• A. A condition where the brain swells rapidly after a second concussion before symptoms from the first have subsided
• B. A common skin condition
• C. A peripheral nerve disease
• D. A cardiovascular event

Answer: (A)

Second-impact syndrome happens when a second concussion occurs before the first concussion has fully resolved, and the brain swells rapidly as a result. The initial injury disrupts the brain’s normal autoregulation, so a subsequent impact can trigger swift diffuse cerebral edema, leading to rising intracranial pressure, potential brain herniation, coma, and even death. It’s an emergency situation that underscores why an athlete or patient should not return to activity until complete symptom resolution and medical clearance. This description isn’t about a skin condition, a peripheral nerve disorder, or a cardiovascular event.

Second-impact syndrome happens when a second concussion occurs before the first concussion has fully resolved, and the brain swells rapidly as a result. The initial injury disrupts the brain’s normal autoregulation, so a subsequent impact can trigger swift diffuse cerebral edema, leading to rising intracranial pressure, potential brain herniation, coma, and even death. It’s an emergency situation that underscores why an athlete or patient should not return to activity until complete symptom resolution and medical clearance. This description isn’t about a skin condition, a peripheral nerve disorder, or a cardiovascular event.