What's the matter with exertional syncope?
summary
Exertional syncope indicates cardiac outflow tract obstruction, mainly due to aortic stenosis. This kind of syncope reflects the cerebral ischemia caused by the inability to increase cardiac output during exertion and the simultaneous expansion of peripheral blood vessels. Prolonged syncope can cause seizures. Hypovolemic and positive inotropic drugs (such as digitalis) can aggravate the outflow tract obstruction in patients with hypertrophic obstructive cardiomyopathy, which may lead to sudden syncope..
What's the matter with exertional syncope?
1. Cardiac outflow tract obstruction, aortic valve stenosis. 2. Decreased venous return, left atrial pressure and ventricular filling. 3. Dysfunction after heart valve replacement may also be the cause. 4. Outflow tract obstruction caused by other reasons (such as pulmonary vascular obstruction or pulmonary hypertension caused by pulmonary embolism), left ventricular insufflation or pericardial tamponade caused by decreased left ventricular compliance, or venous reflux obstruction (such as severe pulmonary hypertension or tricuspid stenosis, intracardiac myxoma).
Part of the syncope before the onset of dizziness, tinnitus, sweating, blurred vision, pale, systemic discomfort and other prodromal symptoms, this period is called prodromal period. After the onset of fatigue, nausea, vomiting, drowsiness, and even incontinence and other symptoms, known as recovery period. Therefore, the whole process of syncope may last for several minutes or longer. Syncope usually does not produce retrograde amnesia, and orientation and correct behavior often recover quickly.
Because there are many causes of syncope, it is called different syncope according to different inducements, such as swallowing syncope, syncope caused by local cerebral blood supply insufficiency caused by various cerebrovascular diseases, syncope caused by nervous tissue lesions, intracranial injury, etc., as well as syncope caused by hyperventilation syncope, hypoglycemic syncope, severe anemia syncope, crying syncope, etc. According to the specific causes, take a variety of treatment measures, active treatment, remove the cause, so as to improve the symptoms.
matters needing attention
The principle of preventing exertional syncope is to adhere to the scientific and systematic training principle to avoid sports diseases such as excessive fatigue and tension. Those who take part in long-term strenuous sports must be trained exercisers. Avoid long-term training and competition in high temperature, high humidity or windless weather in summer. If exertional syncope has occurred, it is better to let the patient lie flat on the ground, so that the cardiovascular system does not have to fight against gravity. At the same time, turn the patient's body to one side to avoid aspiration. It is wrong to let people sit after syncope, because then the blood has to flow upward to the brain.
