transient fainting
Introduction
Introduction Transient fainting, also called simple, vascular fainting, is a sudden and short-lived loss of consciousness, which can be accompanied by systemic precursor symptoms such as dizziness, dizziness, tinnitus, pale and cold sweat, etc. There are upright hypotension; urinary fainting and a long-term hot bath. This disease is more common in young and weak women, caused by the sudden expansion of a wide range of small blood vessels. Because small blood vessels are spread all over the body, the number is large. After a sudden expansion, the blood returning to the heart is reduced, and the cardiac output is correspondingly reduced, thereby causing brain ischemia and causing syncope.
Cause
Cause
Caused by a strong stimuli, such as fear, severe pain, death of a loved one, frustration, overwork or surgery, bleeding, blood, injection, trauma, air sultry, etc., causing reflex peripheral blood vessels, heart palpitations A decrease in blood volume and a sudden drop in blood pressure can lead to transient fainting.
Examine
an examination
Related inspection
General radiography examination of brain CT examination
More than 1 occurs when standing or sitting, rarely in the lying position. Before fainting, there are often aura symptoms such as dizziness, dizziness, nausea, cold sweat and pale complexion, followed by vertigo, weakness and sudden soft fall.
2 blood pressure is significantly reduced (systolic blood pressure is usually below 70 mm Hg), pulse is weak (often between 40 and 50 times per minute) or even unclear.
3 eyes are ignorant, gazing, turning white, and the pupils are often scattered.
4 loss of consciousness, deep and weak breathing.
5 Patients can often wake up within a few seconds or minutes of fainting. There is no sequelae after the attack, but after the onset, there are temporary forgetting, mental paralysis and dizziness.
Diagnosis
Differential diagnosis
Identification of symptoms that are confusing and confusing:
1. Sudden loss of consciousness after a long standing, generally called orthostatic hypotension. Some people have been kneeling on the ground for a long time or sitting for too long and suddenly stand up to produce fainting. The mechanism is due to the long standing, long-lasting, sedentary, and the blood is largely retained in the lower half of the body below the level of the heart, such as the abdominal cavity, legs, etc. At one time, high blood supply cannot be provided, resulting in a decrease in blood supply to the brain and a loss of consciousness.
2, after a deep sleep at night, get up and urinate, suddenly lost consciousness and fall to the ground after urinating, this is called "urinary fainting", the mechanism is related to sudden change from lying position to standing position, cerebral blood flow is relatively reduced. In addition, urinating while standing, bladder emptying after urination causes abdominal cavity emptiness, abdominal pressure is relatively low, a large amount of blood flows to the abdominal cavity, causing the brain to be relatively hypoxic. Especially in the case of standing, the blood supply to the brain is insufficient, which causes the loss of consciousness to fall to the ground.
3, for a long time, the hot water bath causes a large amount of blood to flow to the body muscles or skin, and the blood flow to the brain is reduced (especially when the body position changes) to produce fainting.
The common manifestations of these three situations are: black eyes, flashing gold stars, cold sweats, and then dizziness. My heart knows that I want to faint but I can't support it and fall to the ground. Some people may still have nausea, vomiting, palpitation, or whole body. Various forms such as icy cold, some accompanied by slowing or accelerating heartbeat, and no brain complications are often misdiagnosed as epilepsy or cardiovascular disease. When combined with craniocerebral injury or traumatic subarachnoid hemorrhage, it is easily misdiagnosed as original. Cranial brain diseases, etc., complicate diagnosis and delay treatment.
