Black hood

Introduction Black Mongolian can not see or see the object when the eye is viewed. The blood supply to the visual cortex is mainly from the posterior artery of the brain. When the posterior artery of the brain is blocked, the clinical symptoms of blackness in front of the eye are manifested. Clinically, it occurs in the form of transient erythema, often due to transient cerebral ischemia, anemia, and hypotension.

Cause

1. The occlusion of the anterior circulation of the brain, that is, the thrombus of the internal carotid artery system, including the common thrombus of the middle cerebral artery and the thrombus of the anterior artery.

2. The posterior cerebral artery is blocked. The blood supply area of the posterior circulation is part of the brain stem, cerebellum, temporal lobe and thalamus, and the visual cortex. Many life centers of the human body are in this part, such as thermoregulation, respiratory regulation, sleep conscious regulation, blood pressure regulation, etc. Therefore, when this part is diseased, it will endanger the existence of life.

The thrombosis of the posterior circulation artery that occurs in the patient is little known. Dizziness, blurred vision, sudden blindness, and short-term recovery are the vascular embolisms in the posterior circulation of the brain. The blood supply to the visual cortex is mainly supplied by the posterior cerebral artery. When the posterior artery of the brain is blocked, people will be blind. Medically, it is called transient black Mongolia.

an examination

Related inspection

Blood pressure ophthalmology examination fundus examination blood routine eye function examination

This is a stroke aura, not everyone knows the hemiplegia, because the general stroke of hemiplegia refers to the occlusion of the anterior circulation of the brain, that is, the thrombus of the internal carotid artery system, including the common middle cerebral artery thrombosis and the former Arterial thrombosis, the typical symptoms of this condition are partial weakness, numbness, and oblique eyelids. The thrombosis of the posterior circulation artery that occurs in patients is rarely known. The dizziness mentioned above, the blurred vision, the sudden disappearance of binocular vision, and the short-term recovery are the blood vessel embolism of the posterior circulation of the brain. Because the blood supply to our visual cortex is mainly from the posterior artery of the brain, when the posterior artery of the brain is blocked, people will appear blind, medically known as "transient black Mongolia." The blood supply area of the posterior circulation is part of the brain stem, cerebellum, temporal lobe and thalamus, and the visual cortex. Many life centers of the human body are in this part, such as thermoregulation, respiratory regulation, sleep conscious regulation, blood pressure regulation, etc. Therefore, when this part is diseased, it will endanger the existence of life. Before the disease occurs in this part, the body often has repeated warnings for a long time, such as dizziness, "transient black Mongolia", etc. When people do not care, there will be brain stem infarction, the most critical disease is "basal" Arterial tip syndrome." The site of the disease is at the top of the basilar artery, and together with the bilateral posterior arteries and the superior cerebellar artery, it forms the shape of a Chinese character "dry". Infarction at this site can lead to a severe deficiency of the cerebellum, occipital lobe, and brainstem. Blood, patients with dizziness, sudden blindness, visual hallucinations, or syncope, can be followed by epilepsy convulsions, fever, mild numbness of the limbs, weakness, shallow coma, early diagnosis can be timely medication, such as thrombolytic anticoagulant therapy, and some successful rescue I hope that after a long time, I will lose my chance.

Differential diagnosis

Stroke aura, not hemiplegia, because the general stroke of hemiplegia refers to the occlusion of the anterior circulation of the brain, that is, the thrombus of the internal carotid artery system, including the common middle cerebral artery thrombosis and the anterior artery thrombosis. The typical symptoms are partial weakness, numbness, and skewed eyes. The patient has a thrombus, dizziness, blurred vision, sudden binocular blindness, and short-term recovery, which is a blood vessel embolism in the posterior circulation of the brain.

Transient black sputum, which is a typical symptom of internal carotid artery disease. This symptom often occurs without any warning, and often does not have any triggering factors. The patient's feeling of attack is a sudden loss of visual loss in one eye. The most common complaint is that the field of view of one eye is suddenly blurred from the top of the field of view, dark gray, or black curtain, and quickly covers the lower field of view vertically downwards; sometimes this change in field of view can also The lower field of view of one eye spreads upwards and gradually covers the upper field of view. The loss of vision in a few seconds can reach a peak, and quickly includes the entire field of view, completely black or gray. Partial loss of vision sometimes occurs, including upper or lower field of view. With a blind spot with a clear edge, occasionally a single eye 1/4 visual field loss can occur. Loss of visual field often recovers completely from 5 to 19 minutes, and vision loss can be restored.

Transient black sputum, clinically it is often seen as a sign of carotid artery disease, 70% to 97% of patients with temporary black sputum can be predicted to have carotid artery disease.

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