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词条 Amaurosis fugax
释义

  1. Signs and symptoms

  2. Cause

     Embolic and hemodynamic origin  Ocular origin  Neurologic origin 

  3. Diagnosis

  4. Treatment

  5. See also

  6. References

  7. External links

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}}Amaurosis fugax (Latin fugax meaning fleeting, Greek amaurosis meaning darkening, dark, or obscure) is a painless temporary loss of vision in one or both eyes.[1]

Signs and symptoms

The experience of amaurosis fugax is classically described as a temporary loss of vision in one or both eyes that appears as a "black curtain coming down vertically into the field of vision in one eye;" however, this altitudinal visual loss is relatively uncommon. In one study, only 23.8 percent of patients with transient monocular vision loss experienced the classic "curtain" or "shade" descending over their vision.[2] Other descriptions of this experience include a monocular blindness, dimming, fogging, or blurring.[3] Total or sectorial vision loss typically lasts only a few seconds, but may last minutes or even hours. Duration depends on the cause of the vision loss. Obscured vision due to papilledema may last only seconds, while a severely atherosclerotic carotid artery may be associated with a duration of one to ten minutes.[4] Certainly, additional symptoms may be present with the amaurosis fugax, and those findings will depend on the cause of the transient monocular vision loss.

Cause

Prior to 1990, amaurosis fugax could, "clinically, be divided into four identifiable symptom complexes, each with its underlying pathoetiology: embolic, hypoperfusion, angiospasm, and unknown".[5] In 1990, the causes of amaurosis fugax were better refined by the Amaurosis Fugax Study Group, which has defined five distinct classes of transient monocular blindness based on their supposed cause: embolic, hemodynamic, ocular, neurologic, and idiopathic (or "no cause identified") [6] Concerning the pathology underlying these causes (except idiopathic), "some of the more frequent causes include atheromatous disease of the internal carotid or ophthalmic artery, vasospasm, optic neuropathies, giant cell arteritis, angle-closure glaucoma, increased intracranial pressure, orbital compressive disease, a steal phenomenon, and blood hyperviscosity or hypercoagulability."[7]

Embolic and hemodynamic origin

With respect to embolic and hemodynamic causes, this transient monocular visual loss ultimately occurs due to a temporary reduction in retinal artery, ophthalmic artery, or ciliary artery blood flow, leading to a decrease in retinal circulation which, in turn, causes retinal hypoxia.[8] While, most commonly, emboli causing amaurosis fugax are described as coming from an atherosclerotic carotid artery, any emboli arising from vasculature preceding the retinal artery, ophthalmic artery, or ciliary arteries may cause this transient monocular blindness.

  • Atherosclerotic carotid artery: Amaurosis fugax may present as a type of transient ischemic attack (TIA), during which an embolus unilaterally obstructs the lumen of the retinal artery or ophthalmic artery, causing a decrease in blood flow to the ipsilateral retina. The most common source of these athero-emboli is an atherosclerotic carotid artery.[9]
    However, a severely atherosclerotic carotid artery may also cause amaurosis fugax due to its stenosis of blood flow, leading to ischemia when the retina is exposed to bright light.[10] "Unilateral visual loss in bright light may indicate ipsilateral carotid artery occlusive disease and may reflect the inability of borderline circulation to sustain the increased retinal metabolic activity associated with exposure to bright light."[11]
  • Atherosclerotic ophthalmic artery: Will present similarly to an atherosclerotic internal carotid artery.
  • Cardiac emboli: Thrombotic emboli arising from the heart may also cause luminal obstruction of the retinal, ophthalmic, and/or ciliary arteries, causing decreased blood flow to the ipsilateral retina; examples being those arising due to (1) atrial fibrillation, (2) valvular abnormalities including post-rheumatic valvular disease, mitral valve prolapse, and a bicuspid aortic valve, and (3) atrial myxomas.
  • Temporary vasospasm leading to decreased blood flow can be a cause of amaurosis fugax.[12][13] Generally, these episodes are brief, lasting no longer than five minutes,[14] and have been associated with exercise.[8][15] These vasospastic episodes are not restricted to young and healthy individuals. "Observations suggest that a systemic hemodynamic challenge provoke[s] the release of vasospastic substance in the retinal vasculature of one eye."[14]
  • Giant cell arteritis: Giant cell arteritis can result in granulomatous inflammation within the central retinal artery and posterior ciliary arteries of eye, resulting in partial or complete occlusion, leading to decreased blood flow manifesting as amaurosis fugax. Commonly, amaurosis fugax caused by giant cell arteritis may be associated with jaw claudication and headache. However, it is also not uncommon for these patients to have no other symptoms.[16] One comprehensive review found a two to nineteen percent incidence of amaurosis fugax among these patients.[17]
  • Systemic lupus erythematosus[18][19]
  • Periarteritis nodosa[20]
  • Eosinophilic vasculitis[21]
  • Hyperviscosity syndrome[24]
    • Polycythemia[22]
  • Hypercoagulability[23]
    • Protein C deficiency[24]
    • Antiphospholipid antibodies[25]
    • Anticardiolipin antibodies[29]
    • Lupus anticoagulant[26][27]
  • Thrombocytosis[29]
  • Subclavian steal syndrome
  • Malignant hypertension can cause ischemia of the optic nerve head leading to transient monocular visual loss.[28]
  • Drug abuse-related intravascular emboli[6]
  • Iatrogenic: Amaurosis fugax can present as a complication following carotid endarterectomy, carotid angiography, cardiac catheterization, and cardiac bypass.[29]

Ocular origin

Ocular causes include:

  • Iritis[29]
  • Keratitis[30]
  • Blepharitis[30]
  • Optic disc drusen[29]
  • Posterior vitreous detachment[30]
  • Closed-angle glaucoma[31]
  • Transient elevation of intraocular pressure[6][29]
  • Intraocular hemorrhage[6]
  • Coloboma[29]
  • Myopia[29]
  • Orbital hemangioma[32]
  • Orbital osteoma[33]
  • Keratoconjunctivitis sicca[29] testing

Neurologic origin

Neurological causes include:

  • Optic neuritis[6]
  • Compressive optic neuropathies[6][34]
  • Papilledema: "The underlying mechanism for visual obscurations in all of these patients appear to be transient ischemia of the optic nerve head consequent to increased tissue pressure. Axonal swelling, intraneural masses, and increased influx of interstitial fluid may all contribute to increases in tissue pressure in the optic nerve head. The consequent reduction in perfusion pressure renders the small, low-pressure vessels that supply the optic nerve head vulnerable to compromise. Brief fluctuations in intracranial or systemic blood pressure may then result in transient loss of function in the eyes."[35] Generally, this transient visual loss is also associated with a headache and optic disk swelling.
  • Multiple sclerosis can cause amaurosis fugax due to a unilateral conduction block, which is a result of demyelination and inflammation of the optic nerve, and "...possibly by defects in synaptic transmission and putative circulating blocking factors."[36]
  • Migraine[37][38][39][40][41][42][43][44]
  • Pseudotumor cerebri[63]
  • Intracranial tumor[45]
  • Psychogenic[30]

Diagnosis

Despite the temporary nature of the vision loss, those experiencing amaurosis fugax are usually advised to consult a physician immediately as it is a symptom that may herald serious vascular events, including stroke.[46][47] Restated, “because of the brief interval between the transient event and a stroke or blindness from temporal arteritis, the workup for transient monocular blindness should be undertaken without delay.” If the patient has no history of giant cell arteritis, the probability of vision preservation is high; however, the chance of a stroke reaches that for a hemispheric TIA. Therefore, investigation of cardiac disease is justified.[6]

A diagnostic evaluation should begin with the patient's history, followed by a physical exam, with particular importance being paid to the ophthalmic examination with regards to signs of ocular ischemia. When investigating amaurosis fugax, an ophthalmologic consult is absolutely warranted if available. Several concomitant laboratory tests should also be ordered to investigate some of the more common, systemic causes listed above, including a complete blood count, erythrocyte sedimentation rate, lipid panel, and blood glucose level. If a particular cause is suspected based on the history and physical, additional relevant labs should be ordered.[6]

If laboratory tests are abnormal, a systemic disease process is likely, and, if the ophthalmologic examination is abnormal, ocular disease is likely. However, in the event that both of these routes of investigation yield normal findings or an inadequate explanation, noninvasive duplex ultrasound studies are recommended to identify carotid artery disease. Most episodes of amaurosis fugax are the result of stenosis of the ipsilateral carotid artery.[48] With that being the case, researchers investigated how best to evaluate these episodes of vision loss, and concluded that for patients ranging from 36–74 years old, "...carotid artery duplex scanning should be performed...as this investigation is more likely to provide useful information than an extensive cardiac screening (ECG, Holter 24-hour monitoring, and precordial echocardiography)."[48] Additionally, concomitant head CT or MRI imaging is also recommended to investigate the presence of a “clinically silent cerebral embolism.”[6]

If the results of the ultrasound and intracranial imaging are normal, “renewed diagnostic efforts may be made,” during which fluorescein angiography is an appropriate consideration. However, carotid angiography is not advisable in the presence of a normal ultrasound and CT.[49]

Treatment

If the diagnostic workup reveals a systemic disease process, directed therapies to treat that underlying cause should be initiated. If the amaurosis fugax is caused by an atherosclerotic lesion, aspirin is indicated, and a carotid endarterectomy considered based on the location and grade of the stenosis. Generally, if the carotid artery is still patent, the greater the stenosis, the greater the indication for endarterectomy. "Amaurosis fugax appears to be a particularly favorable indication for carotid endarterectomy. Left untreated, this event carries a high risk of stroke; after carotid endarterectomy, which has a low operative risk, there is a very low postoperative stroke rate."[50] However, the rate of subsequent stroke after amaurosis is significantly less than after a hemispheric TIA, therefore there remains debate as to the precise indications for which a carotid endarterectomy should be performed. If the full diagnostic workup is completely normal, patient observation is recommended.[6]

See also

  • Ocular ischemic syndrome
  • Amaurosis
  • Hemianopsia

References

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6. ^1 2 3 4 5 6 7 8 9 {{cite journal |title=Current management of amaurosis fugax. The Amaurosis Fugax Study Group |journal=Stroke |volume=21 |issue=2 |pages=201–8 |date=February 1990 |pmid=2406992 |url=http://stroke.ahajournals.org/cgi/pmidlookup?view=long&pmid=2406992 |doi=10.1161/01.STR.21.2.201 }}{{Dead link|date=February 2019 |bot=InternetArchiveBot |fix-attempted=yes }}
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47. ^{{cite journal |vauthors=Rothwell PM, Warlow CP |title=Timing of TIAs preceding stroke: time window for prevention is very short |journal=Neurology |volume=64 |issue=5 |pages=817–20 |date=March 2005 |pmid=15753415 |url=http://www.neurology.org/cgi/pmidlookup?view=long&pmid=15753415 |doi=10.1212/01.WNL.0000152985.32732.EE }}
48. ^1 {{cite journal |vauthors=Smit RL, Baarsma GS, Koudstaal PJ |title=The source of embolism in amaurosis fugax and retinal artery occlusion |journal=Int Ophthalmol |volume=18 |issue=2 |pages=83–6 |year=1994 |pmid=7814205 |url=http://www.iovs.org/cgi/reprint/1/1/136.pdf |doi=10.1007/BF00919244}}
49. ^{{cite journal |vauthors=Walsh J, Markowitz I, Kerstein MD |title=Carotid endarterectomy for amaurosis fugax without angiography |journal=Am. J. Surg. |volume=152 |issue=2 |pages=172–4 |date=August 1986 |pmid=3526933 |url=http://linkinghub.elsevier.com/retrieve/pii/0002-9610(86)90236-9 |doi=10.1016/0002-9610(86)90236-9 |format=}}
50. ^{{cite journal |vauthors=Bernstein EF, Dilley RB |title=Late results after carotid endarterectomy for amaurosis fugax |journal=J. Vasc. Surg. |volume=6 |issue=4 |pages=333–40 |date=October 1987 |pmid=3656582 |doi=10.1067/mva.1987.avs0060333 }}

External links

{{Medical resources
| DiseasesDB = 501
| ICD10 = {{ICD10|G|45|3|g|40}}
| ICD9 = {{ICD9|362.34}}
| ICDO =
| OMIM =
| MedlinePlus = 000784
| eMedicineSubj = neuro
| eMedicineTopic = 480
| MeshID = D020757
}}{{Diseases of the nervous system}}{{Eye pathology}}{{Cerebrovascular diseases}}

4 : Stroke|Diseases of the eye and adnexa|Episodic and paroxysmal disorders|Symptoms
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