Transient ischemic attack (TIA) is a sudden episode of focal, reversible neurological deficit and lasts for a period of:

Appeared in: HP CHO -9 October 2022

Explanation

A Transient Ischemic Attack (TIA) is defined as a temporary episode of neurologic dysfunction caused by focal brain ischemia.
The standard medical definition specifies that these symptoms must resolve completely within 24 hours.
This time frame is the primary feature that distinguishes a TIA from a completed ischemic stroke.
While most TIAs last for a much shorter duration (often less than an hour), the 24-hour mark serves as the official diagnostic cutoff.

Option A: While many TIAs are very brief and can last less than a minute, this is not the defining upper time limit for the diagnosis. A TIA can last longer than one minute and still be classified as such.
Option C: Neurological deficits that persist for more than 24 hours are, by definition, classified as a stroke, not a TIA. This duration implies that permanent brain injury (infarction) has likely occurred.
Option D: This duration also falls under the definition of a stroke. Any focal neurologic deficit lasting more than 24 hours is considered a stroke, indicating permanent brain damage.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition and duration of Transient Ischemic Attack (TIA) as background academic context rather than a clinical decision trigger.
A TIA is a critical warning sign; about 10-15% of people who have a TIA will have a major stroke within 3 months, with half of those occurring within 48 hours.
Nurses must educate patients that a TIA is a medical emergency and they should seek immediate care, not just wait for symptoms to resolve at home.
Prompt evaluation after a TIA can identify the underlying cause (e.g., atrial fibrillation, carotid stenosis) and allow for interventions that can prevent a devastating stroke.

How to Approach the Question

First, identify the core concept of the question, which is the definition of a 'Transient Ischemic Attack (TIA)'.
Focus on the keywords 'transient' and 'reversible,' which imply a temporary condition.
Recall the standard medical time frame used to differentiate a temporary ischemic event (TIA) from a permanent one (stroke).
Evaluate the options based on this time frame. The established definition for the complete resolution of TIA symptoms is 'less than 24 hours'.
Eliminate options that describe a stroke ('More than 24 hours', 'More than 48 hours') or are too restrictive to be the official definition ('Less than one minute').

Concept Tested & Keywords

Concept Tested: Definition and duration of Transient Ischemic Attack (TIA)
Stem keywords: Transient ischemic attack (TIA), focal, reversible neurological deficit, lasts for a period of
Lead-in keywords: BEST, MOST RELEVANT CLUE
Negative lead-in flag: false

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E6 Medicine Harrison 22e Part 2 p. 1352-1354

E6 Nursing Brunner Adult Health 3SA Vol 2 Part 2 p. 60-62

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 594-596

Practise the full HP CHO -9 October 2022

Attempt every question from this paper in a timed mock, then review the full solution for each one.