Which statement best describes a transient ischemic attack?

• A. Neurologic deficits lasting less than 1 hour
• B. Symptoms that persist permanently
• C. Onset with loss of consciousness
• D. Amnesia without focal deficits

Answer: (A)

A transient ischemic attack is a brief episode of focal neurologic dysfunction caused by temporary reduction in blood flow to a specific brain area, with complete recovery within a short period. The defining point is that it resolves, leaving no lasting deficit, and the modern time cutoff is typically within one hour. This is why the statement describing neurologic deficits that last less than one hour fits best.

The other scenarios don’t fit TIAs: persistent symptoms imply a completed stroke rather than a transient event; loss of consciousness is not typical for TIAs, which usually present with focal deficits while the patient remains awake; amnesia without focal deficits lacks the localized neurological signs that define TIAs. TIAs are important warnings for possible future stroke, requiring prompt evaluation and risk-factor management.