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Types of Syncope

Neurologic Syncope
Neurologic Syncope

Neurocardiogenic syncope is the most common reason for fainting. Neurocardiogenic syncope is also called vasovagal syncope. In neurocardiogenic syncope, blood pressure rapidly falls, and blood flow to the brain becomes very low.

Postural Orthostatic Tachycardia Syndrome (POTS)
Postural Orthostatic Tachycardia Syndrome (POTS)

Postural orthostatic tachycardia syndrome (POTS) is a condition in which a change from lying to standing causes an abnormally large increase in heart rate. This occurs with symptoms that may include lightheadedness, trouble thinking, blurry vision, or weakness.

Postural Syncope (Also Called Postural Hypotension)
Postural Syncope (Also Called Postural Hypotension)

Syncope, also known as fainting, is a loss of consciousness and muscle strength characterized by a fast onset, short duration, and spontaneous recovery. It is caused by a decrease in blood flow to the brain, usually from low blood pressure.

Situational Syncope
Situational Syncope

Medical Definition of Situational syncope Situational syncope: The temporary loss of consciousness in a particular kind of situation. The situations that trigger this reaction are diverse, and include having blood drawn, straining while urinating or defecating, and coughing.

Unknown Causes of Syncope
Unknown Causes of Syncope

Syncope is a temporary loss of consciousness usually related to insufficient blood flow to the brain. It’s also called fainting or "passing out.". It most often occurs when blood pressure is too low (hypotension) and the heart doesn't pump enough oxygen to the brain.

source: heart.org