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randomposting

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Just in case you were wondering. [May. 29th, 2005|10:11 pm]
randomposting
[mood |uncomfortableuncomfortable]
[music |Vecchia Zimarra]

The vasovagal response is the development of inappropriate cardiac slowing and arteriolar dilatation. Vasovagal responses reflect autonomic neural changes: bradycardia results from sudden augmentation of efferent vagal activity, and hypotension results from sudden reduction or cessation of sympathetic activity and relaxation of arterial resistance vessels. Two different neural pathways are thought to be involved, one originating in the hypothalamus, the other in the heart. Direct hypothalamic activation of the medullary cardiovascular centres triggered by emotional stress or pain causes a vasovagal response (central type). The combination of a reduced central blood volume secondary to venous pooling or blood loss, and an increased inotropic state of the heart, may stimulate ventricular mechanoreceptors and provoke vasodilatation and bradycardia (peripheral type). Cardiovascular afferents originating from stretch receptors in various parts of the vascular tree sometimes induce opposite reflexes when compared with those from ventricular afferents. The depressor reflex involved in the peripheral type of vasovagal response originates in the heart itself and overrides normal baroreflex circulatory control; an antagonism between the control of volume and pressure on the filling side of the heart and the control system of arterial pressure becomes apparent. Vasovagal responses are not necessarily abnormal; the neural pathways involved in the vasovagal response are probably present in all healthy subjects who individually mainly differ in susceptibility.
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Comments:
[User Picture]From: neotatsu
2005-05-29 10:02 pm (UTC)
I feel smart now, as, I not only understood it, but, have actually read that before, hahah (^_^)
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[User Picture]From: randomposting
2005-05-29 10:10 pm (UTC)

*Blinkblink* Where did you read it before?
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[User Picture]From: neotatsu
2005-05-29 10:18 pm (UTC)
I read alot, and pretty fast... And, I'm a sponge for random information...

Not to mention I've experienced several Vasal Syncopes before, heh...

I've always experienced episodes of the Vasovagal response, though I didn't realize what it was till I googled fainting near the end of the year last year, because the "dizzyness" (as I always called it, of course) led to fainting a couple times... And was starting to happen more often. (probably due to not eating, and dehydration..)

Which is kinda sad, because I read quite a bit about it, when researching hypertension... (Did alot of medical researching when I had a headache that didn't go away for over three years..)
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[User Picture]From: randomposting
2005-05-29 10:26 pm (UTC)
You know EXACTLY what it's about then. Happened to me this morning. I've been having a hard time peeing because a stone was blocking my ureter, so I was like birthing a baby trying to push to be able to pee.. and so this morning I pushed so hard when I stood up, I collapsed.
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[User Picture]From: neotatsu
2005-05-29 10:28 pm (UTC)
Hahaha That sucks >,<"

Personally, it has a tendency to happen to me at very inopportune times...
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[User Picture]From: randomposting
2005-05-29 10:34 pm (UTC)
Ooooh! Am I following where you're leading?
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[User Picture]From: neotatsu
2005-05-29 10:34 pm (UTC)
lol, that depends on where you think I'm leading :-p
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[User Picture]From: randomposting
2005-05-29 10:51 pm (UTC)
During sex?
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[User Picture]From: neotatsu
2005-05-29 10:53 pm (UTC)
I fainted once during.. umm.. foreplay, shall we say?...

But, yes, that's one example of an "unfortunate time", heh... >,
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[User Picture]From: randomposting
2005-05-30 12:01 am (UTC)
What do ya mean? :)
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[User Picture]From: santiagodr_j
2005-05-29 11:33 pm (UTC)
I must kick ass times the entire student population of my highschool then.
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[User Picture]From: randomposting
2005-05-30 12:02 am (UTC)
*Continues to be confused*
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[User Picture]From: neotatsu
2005-05-29 10:19 pm (UTC)
And, I do believe someone I know has a vasovagal syndrome... heh
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[User Picture]From: randomposting
2005-05-29 10:28 pm (UTC)
Oooh. *nod, hug*
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