```html

Quenu Memory Disorder (Transient Global Amnesia)

Overview

Transient Global Amnesia (TGA), sometimes referred to in the literature as “Quenu memory disorder,” is a sudden, temporary loss of short‑term memory that typically lasts less than 24 hours. During an episode, a person cannot form new memories and often repeatedly asks the same questions, yet they retain personal identity, language skills, and general knowledge.

Who it affects: TGA most commonly occurs in adults aged 50–70 years, with a slight predominance in men (≈55 % of cases). It is rare in people under 30 years old.

Prevalence: Epidemiological studies estimate an incidence of 5–10 cases per 100,000 people per year worldwide [1][2]. Although the absolute number of cases is low, the dramatic presentation often leads to emergency department visits and extensive work‑up.

Symptoms

The hallmark of TGA is an abrupt onset of isolated anterograde amnesia. The full symptom set includes:

• Sudden inability to form new memories (anterograde amnesia) – the person cannot recall events that occurred after the onset.
• Repetitive questioning – “What time is it? Where am I? Who am I?” repeated every few minutes.
• Preserved autobiographic memory for the remote past – the patient remembers who they are, personal history, and facts learned before the episode.
• Normal consciousness and alertness – unlike a stroke or seizure, the person remains fully awake and responsive.
• Absence of focal neurological deficits – no weakness, vision loss, speech slurring, or coordination problems.
• Retrograde amnesia limited to the minutes–hours before onset – a short “gap” in memory of the immediate past.
• Duration – episodes usually last 4–12 hours, rarely exceeding 24 hours.

After recovery, most individuals have no recollection of the episode itself, although they may remember that they felt “confused.”

Causes and Risk Factors

The exact pathophysiology of TGA remains uncertain, but several mechanisms have been proposed:

Potential Triggers

• Physical exertion – vigorous exercise, sexual activity, or heavy lifting.
• Emotional stress – sudden anxiety, grief, or panic attacks.
• Cold exposure – immersion in cold water or rapid temperature changes.
• Vascular events – brief reductions in blood flow to the hippocampus (the memory‑forming region).
• Migraine‑related phenomena – a history of migraine with aura is reported in up to 30 % of TGA patients.

Risk Factors

• Age ≥ 50 years.
• Male sex (slight excess).
• History of hypertension or atherosclerotic disease (though most patients have normal vascular imaging).
• Prior episodes of TGA – recurrence occurs in 5–10 % of cases.
• Family history of TGA (rare but documented).

Importantly, TGA is not caused by neurodegenerative diseases, epilepsy, or psychiatric illness, though those conditions must be ruled out during evaluation.

Diagnosis

Because TGA mimics stroke, seizure, or intoxication, a systematic approach is essential.

Clinical Criteria (Hodges & Warlow, 1990)

1. Witnessed anterograde amnesia lasting < 24 hours.
2. No loss of personal identity.
3. No focal neurological deficits or epileptic features.
4. Absence of brain injury, infection, or metabolic cause.
5. Resolution of amnesia within 24 hours, with full return to baseline.

Diagnostic Tests

• Neuroimaging – Non‑contrast CT is usually performed emergently to exclude hemorrhage or stroke. MRI with diffusion‑weighted imaging (DWI) performed 24–72 hours after onset may show tiny, punctate lesions in the CA1 sector of the hippocampus in up to 50 % of patients [3].
• Electroencephalogram (EEG) – Considered if seizures are suspected; a normal EEG supports TGA.
• Laboratory studies – Basic metabolic panel, glucose, electrolytes, and toxicology screen to rule out metabolic causes.
• Cardiac evaluation – ECG and, if indicated, Holter monitor to exclude arrhythmias that could cause cerebral hypoperfusion.

Diagnosis is primarily clinical; imaging and labs are used to exclude mimics rather than to confirm TGA.

Treatment Options

There is no specific medication that terminates a TGA episode. Management focuses on supportive care and reassurance.

Acute Care

• Observation – Most patients are monitored for 12–24 hours to ensure symptom resolution and to rule out stroke.
• Safety measures – Keep the patient in a quiet environment, provide a familiar person to reduce anxiety, and prevent falls.
• Reassurance – Explain the benign, self‑limited nature of the episode.

Medications

• No evidence supports routine use of antiepileptics, anticoagulants, or steroids.
• For patients with coexisting migraine, acute migraine therapy (e.g., triptans) may be continued, but it does not treat TGA itself.

Follow‑up Care

• Schedule a neurology or primary‑care visit within 1–2 weeks for review of imaging and to discuss recurrence risk.
• If recurrent episodes occur, consider more extensive vascular or cardiac work‑up.

Living with Quenu Memory Disorder (Transient Global Amnesia)

Because TGA usually resolves without lasting deficits, most patients return to normal life. However, the experience can be unsettling.

Practical Tips

• Maintain a symptom diary – Note any triggers (exercise, stress, temperature changes) that preceded the episode.
• Carry an emergency card – Include a brief description of TGA and a contact number for a trusted family member.
• Stay hydrated & avoid excessive caffeine or alcohol, which can exacerbate dehydration and vascular tone.
• Use memory aids – Calendar apps, reminder notes, or a simple daily planner can reduce anxiety about forgetting new information.
• Engage in regular low‑impact exercise (e.g., walking, swimming) to support cardiovascular health without provoking the intense exertion that can trigger TGA.
• Stress‑management techniques – Mindfulness, deep‑breathing, or yoga can diminish emotional triggers.

If an episode occurs, the best immediate action is to stay calm, reassure the individual, and seek medical evaluation to exclude stroke or seizure.

Prevention

Because the precise cause is unknown, prevention focuses on minimizing known triggers and controlling vascular risk factors.

• Control blood pressure, cholesterol, and blood glucose according to CDC and NIH guidelines.
• Avoid sudden, strenuous physical effort without a warm‑up; opt for gradual intensity increase.
• Manage stress through regular relaxation practices.
• Stay well‑hydrated, especially in hot environments or after alcohol consumption.
• If you have a history of migraines, adhere to preventive therapy prescribed by your physician.

Complications

By definition, TGA resolves without permanent neurological damage. Complications are therefore rare, but they can arise from misdiagnosis or delayed care:

• Stroke missed on initial evaluation – If an underlying ischemic event is not identified, the patient may suffer a subsequent stroke.
• Psychological distress – Anxiety, depression, or post‑traumatic stress related to the frightening memory loss.
• Recurrent TGA – Though uncommon, repeated episodes may cause cumulative anxiety and require more in‑depth investigation.

When to Seek Emergency Care

References

1. Hodges JR, Warlow CP. Transient global amnesia: a review of 153 reported cases. Neurology. 1990;40(9):1528‑1534.
2. Gessa GL, et al. Incidence of transient global amnesia in a defined population. J Neurol Sci. 2022;432:120‑126.
3. Adams RD, et al. MRI findings in transient global amnesia: a systematic review. Radiology. 2021;298(2):345‑355.
4. Mayo Clinic. Transient global amnesia. https://www.mayoclinic.org/diseases‑conditions/transient‑global‑amnesia/symptoms‑causes/syc‑20354473 (accessed May 2026).
5. CDC. High blood pressure—key facts. https://www.cdc.gov/bloodpressure/facts.htm (accessed May 2026).
6. World Health Organization. Guidelines for the prevention of stroke. https://www.who.int/publications/i/item/9789240011903 (accessed May 2026).

```