What is Asystolic vasovagal syncope?

In asystolic vasovagal reactions, presyncope may be triggered by increased left ventricular contractility and is associated with increased levels of parasympathetic and sympathetic activity. Asystole and peripheral vasodilatation may be caused by sudden and complete withdrawal of the increased sympathetic activity.

What causes frequent vasovagal syncope?

Vasovagal syncope is caused by a sudden drop in blood pressure, often triggered by a reaction to something. This causes your heart to slow down for a short time. As a result, your brain may not get enough oxygen-rich blood, which causes you to pass out. Vasovagal syncope is typically not a serious health condition.

What medications can cause vasovagal syncope?

Which drugs may cause syncope?

• Agents that reduce blood pressure (eg, antihypertensive drugs, diuretics, nitrates)
• Agents that affect cardiac output (eg, beta blockers, digitalis, antiarrhythmics)
• Agents that prolong the QT interval (eg, tricyclic antidepressants, phenothiazines, quinidine, amiodarone)

How does vasodilation cause syncope?

The current concept is that the vasodilation which contributes to fainting (vasovagal syncope) is caused entirely by withdrawal of sympathetic vasoconstrictor tone (i.e. passive vasodilation). This concept has supplanted the idea that an active, sympathetically mediated component to the vasodilation exists in humans.

What happens when you have a vasovagal syncope episode?

The vasovagal syncope trigger causes your heart rate and blood pressure to drop suddenly. That leads to reduced blood flow to your brain, causing you to briefly lose consciousness. Vasovagal syncope is usually harmless and requires no treatment. But it’s possible that you may injure yourself during a vasovagal syncope episode.

What is the difference between vagovagal and Reflex syncope?

Not to be confused with Vagovagal reflex. Reflex syncope is a brief loss of consciousness due to a neurologically induced drop in blood pressure and/ or a decrease in heart rate. Before an affected person passes out, there may be sweating, a decreased ability to see, or ringing in the ears.

Can a syncope occur without any identifiable trigger?

Their syncope may occur without any identifiable trigger, and without any warning symptoms. Making the correct diagnosis in these cases can present a real challenge to the doctor. In general, vasovagal syncope is not itself life-threatening, but injuries that result from falling may be.

What does syncope stand for in medical terms?

(Syncope, pronounced sin-co-pee, is the greek / medical term for a blackout caused by not enough blood reaching the brain). If you faint to the floor, or lie down before fainting (and if possible raise your legs), blood immediately returns to your heart, which can then pump blood to your brain again, and you regain consciousness.