Histamine in Type I Hypersensitivity: Postcapillary venules or arterioles?

[Old Style Nanny]

Is there any arteriolar dilation at all in Type I HS?

According to FA it is only postcapillary venules, but according to Goljan, in bee sting, arteriolar dilatation causes calor and rubor while venular dilatation causes tumor, all because of histamine.

OSN

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[glykon]

Is there any arteriolar dilation at all in Type I HS?

According to FA it is only postcapillary venules, but according to Goljan, in bee sting, arteriolar dilatation causes calor and rubor while venular dilatation causes tumor, all because of histamine.

OSN

Pathoma said it as well: vasodilation of arterioles-> rubor, calor
+ increased permeability of postcapillary venules-> fluid moves from vessels to the interstitium->tumor.

p.s. FA is far from complete for inflammation, so build on it with more complex resources

 

[image187]

FA is good up until a limit. if another source, and textbook for that matter (especially goljian), says anything different, id go with that source. goljian is awesome

 

[Old Style Nanny]

Thanks guys. Just wanted to make sure.