Why the sudden syncope in children

Syncope is due to temporary lack of extensive cerebral circulation, resulting in the cerebral cortex caused by a high degree of inhibition of short-term loss of consciousness. Commonly found in older children. Children before they attack the body does not feel, see things become blurred, pale, sweating, then dizziness, weak limbs, sudden loss of consciousness. Common types of syncope are:
1. Reflex syncope. The most common, accounting for various types of syncope of 90%. Syncope can be divided into simple orthostatic hypotension. Simple syncope often have significant incentives, such as emotional stress, fear, hot, standing too long; or various puncture, injection, extraction caused. The occurrence of orthostatic hypotension in the supine or squatting by the sudden starting immediately, or when standing for too long. Such as certain drugs such as L-dopa can cause orthostatic hypotension.
2. Cardiogenic syncope. If a serious arrhythmia, sick sinus syndrome, cyanotic congenital heart disease, such as primary pulmonary hypertension.
3. Cerebral syncope. Transient cerebral ischemia, pulseless disease, subarachnoid hemorrhage, chronic encephalopathy, such as lead poisoning.
4. Medullary syncope. Brainstem vascular lesions, cancer, central nervous system degenerative diseases, spinal cord gray high quality go far; certain drugs such as sedatives, tranquilizers vasomotor center to have a direct inhibitory effect.