![]() ![]() This is an emergent condition warranting immediate reduction of IOP. On the contrary, CRA pulsations is an ominous sign, indicating intraocular pressure (IOP) to be higher than CRA pressure. It is one of the early signs of raised CSF pressure. ![]() Its absence may also indicate increase in cerebrospinal fluid (CSF) pressure greater than 180-190 mmH20. It may be absent in 10-15% of normal people. Central retinal vein pulsations are seen in 85-90% of the normal people. The pulsations from central retinal artery are transmitted to relatively thin vein walls through the intraocular fluid. The central retinal vein (CRV) pulsations are actually transmitted pulsations from central retinal artery (CRA). A pulsating central retinal artery is an emergency because it indicates a drop in the arterial pressure, which will generally be caused by a blockage of the common carotid artery. The arterial pressure at head level being higher (approximately 80mmHg), the central retinal artery will not normally show a pulsation. MorbidAnatomy ( talk) 00:36, 17 October 2008 (UTC) Reply Īnswer: The central retinal vein will show a spontaneous pulsation due to the fact that the veinous pressure is close to the intraocular pressure (which is normally between 10 and 21 mmHg). Barker, Burton, and Zieve’s Principles of Ambulatory Medicine (fifth edition) and Harrison’s Principles of Internal Medicine (thirteenth edition) also were useless. ![]() Rhoades’ and Tanner’s Medical Physiology was also useless. Moore and Dalley’ Clinically Oriented Anatomy states nothing of venous pulsation but says that “pulsation of the retinal arteries is usually visible." Ross and Pawlina’s Histology was useless. The 39th edition of Gray’s Anatomy is woefully deficient in its description of the central retinal vein (ambiguously indicating forward flow (?)) but it does say that the central retinal artery generally does not have a visible pulse on opthalmoscopy. Swartz’s Textbook of Physical Diagnosis says that the central retinal vein may show “spontaneous pulsation” in 85% of patients. Here’s what I found so far: Bates’ Guide to Physical Examination and History Taking says that venous pulsation may be visible. I hypothesized that this pulse was due to its proximity to the artery but neither one of us had a truly satisfying answer. He showed me a fundoscopic image of my eye and pointed to where he routinely sees a pulse-we both agreed that it was the central retinal vein. I told him that I believe him but that I didn’t understand how that could be. Not being able to keep my mouth shut I stated that I was under the impression that arteries should be pulsing, not veins. So I went to my optometrist the other day and as he was looking in my eye he made a casual comment that he could see the vein in my retina pulsing. This article is supported by the Ophthalmology task force. This article has been rated as Low-importance on the project's importance scale. ![]() Medicine Wikipedia:WikiProject Medicine Template:WikiProject Medicine medicine articles Please visit the project page for details or ask questions at Wikipedia talk:WikiProject Medicine. This article is within the scope of WikiProject Medicine, which recommends that medicine-related articles follow the Manual of Style for medicine-related articles and that biomedical information in any article use high-quality medical sources. Medicine : Ophthalmology C‑class Low‑importance This article has been classified as relating to gross anatomy. This article has been rated as Mid-importance on the project's importance scale. This article has been rated as C-class on Wikipedia's content assessment scale. Anatomy Wikipedia:WikiProject Anatomy Template:WikiProject Anatomy Anatomy articles If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks. This article is within the scope of WikiProject Anatomy, a collaborative effort to improve the coverage of Anatomy on Wikipedia. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |