Syncope, swallowing
The temporary loss of consciousness upon swallowing. Syncope is the temporary loss of consciousness or, in plain English, fainting. The situations that trigger this reaction are diverse and include having blood drawn, straining while urinating (micturition syncope) or defecating, coughing or swallowing. The reaction also can be due to the emotional stress of fear or pain. Under these conditions, people often become pale and feel nauseated, sweaty, and weak just before they lose consciousness. Situational syncope is caused by a reflex of the involuntary nervous system called the vasovagal reaction. The vasovagal reaction leads the heart to slow down (bradycardia) and, at the same time, it leads the nerves to the blood vessels in the legs to permit those vessels to dilate (widen). The result is that the heart puts out less blood, the blood pressure drops, and what blood is circulating tends to go into the legs rather than to the head. The brain is then deprived of oxygen, and the fainting episode occurs.

Medical dictionary. 2011.

Look at other dictionaries:

  • Syncope (fainting) — Partial or complete loss of consciousness with interruption of awareness of oneself and ones surroundings. When the loss of consciousness is temporary and there is spontaneous recovery, it is referred to as syncope or, in nonmedical quarters,… …   Medical dictionary

  • Syncope (medicine) — ICD 10 R55 ICD 9 …   Wikipedia

  • syncope — syncopic /sin kop ik/, syncopal, adj. /sing keuh pee , sin /, n. 1. Gram. the contraction of a word by omitting one or more sounds from the middle, as in the reduction of never to ne er. 2. Pathol. brief loss of consciousness associated with… …   Universalium

  • Swallowing syncope — The temporary loss of consciousness upon swallowing. Syncope is the temporary loss of consciousness or, in plain English, fainting. The situations that trigger this reaction are diverse and include having blood drawn, straining while urinating… …   Medical dictionary

  • Syncope, coughing — The temporary loss of consciousness upon coughing. Syncope is the temporary loss of consciousness or, in plain English, fainting. The situations that trigger this reaction are diverse and include having blood drawn, straining while urinating… …   Medical dictionary

  • Syncope, defecation — The temporary loss of consciousness upon defecating (having a bowel movement). Syncope is the temporary loss of consciousness or, in plain English, fainting. The situations that trigger this reaction are diverse and include having blood drawn,… …   Medical dictionary

  • Syncope, micturition — The temporary loss of consciousness upon urinating. (Syncope is the temporary loss of consciousness or, in plain English, fainting). The situations that trigger this reaction are diverse and include having blood drawn, straining while urinating… …   Medical dictionary

  • syncope — Loss of consciousness and postural tone caused by diminished cerebral blood flow. [G. synkope, a cutting short, a swoon] Adams Stokes s. s. due to complete AV block. SYN: Morgagni Adams Stokes s.. cardiac s. fainting with unconsciousness of any …   Medical dictionary

  • swallow syncope — syncope associated with swallowing, a disorder of atrioventricular conduction mediated by the vagus nerve …   Medical dictionary

  • Micturition syncope — The temporary loss of consciousness upon urinating. (Syncope is the temporary loss of consciousness or, in plain English, fainting). The situations that trigger this reaction are diverse and include having blood drawn, straining while urinating… …   Medical dictionary

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