Page 1 of 1: y retinal artery pulsations are not seen in fundoscopy??

syndrome_xy · Credits: 10947 My Scrapbook

while examining fundus one sees the retinal vein pulsate and not the retinal artery. does anyone know the reason

guest · Credits: 78825 My Scrapbook My Reading List 262569 Books

Pulsation of retinal vein has been of much debate since long. Here is a plausible explanation:

The pulsations are in fact caused by variation in the pressure gradient along the retinal vein as it traverses the lamina cribrosa. The pressure gradient varies because of the difference in the pulse pressure between the intraocular space and the cerebrospinal fluid. The importance of this is that as the intracranial pressure rises the intracranial pulse pressure rises to equal the intraocular pulse pressure and the spontaneous venous pulsations cease. Thus it is shown that cessation of the spontaneous venous pulsation is a sensitive marker of raised intracranial pressure.

syndrome_xy · Credits: 10947 My Scrapbook

thanka chand. u r doing a good work here. but in fundoscopy one sees both retinal artery

and retinal vein..? am i right?? but we dont c the pulsations of the retinal artery. right

any specific reason??

guest · Credits: 78825 My Scrapbook My Reading List 262569 Books

Thanks doctor - Here is the explanation:

Pulsation can be seen in retinal vessels only when the pressure in the vessel equals the intraocular pressure (IOP). The pressure in the central retinal vein is normally equal to the IOP, i.e. on average 15mmHg. The pressure in the artery entering the eye has been estimated to be within 65-70mmHg. Since blood flow into the eye is directed against a much lower gradient (i.e. the IOP), there is a steadystream of blood flow into the eye via the artery and no pulsation is seen.

syndrome_xy · Credits: 10947 My Scrapbook

thanks chand. u r bein helpful to lot of people here,

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