Neurocardiogenic syncope, which is also referred to as neurally-mediated or vasovagal syncope, is the one of the most common causes of fainting, according to UpToDate. People with this condition pass out or lose consciousness due to unusually low blood pressure, which prevents adequate amounts of oxygen from reaching the brain. People who develop neurocardiogenic syncope symptoms should receive further evaluation and care from a physician.
Loss of Consciousness
The primary symptom of this condition is syncope, or loss of consciousness. Fainting typically occurs when a person with neurocardiogenic syncope stands up, an action that causes blood pressure levels to drop in the body, the American Heart Association explains. Affected people can collapse and are temporarily unresponsive to verbal or auditory commands or requests. Falling to the ground restores the normal flow of oxygen to the brain, which allows affected people to become responsive again within a few seconds or minutes following initial loss of consciousness.
Lightheadedness
Prior to losing consciousness, people can experience sensations of lightheadedness or dizziness. A person can appear unstable upon standing or may attempt to grab onto a nearby object or person to steady herself.
Grayed or Tunnel Vision
People with neurocardiogenic syncope can develop visual alterations as a symptom of this condition. Immediately before passing out, a person can notice that her field of vision appears gray or foggy, or she may only be able to see objects directly in front of her--a symptom called tunnel vision, MayoClinic.com explains. Like dizziness, tunnel vision can cause affected people to appear unbalanced while standing or walking.
Nausea
Sensations of nausea can arise in people with neurocardiogenic syncope. Upset stomach symptoms typically occur in conjunction with dizziness or vision changes.
Warmth, Sweating or Pale Skin
People can experience an unusual sensation of warmth across the body prior to fainting, according to the AHA. Additionally, affected individuals may break out in a cold, clammy sweat or may appear abnormally pale or sickly.
