Orthostatic hypotension: Difference between revisions
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==Causes== | ==Causes== | ||
[[Endarterectomy]] of the [[internal carotid artery]] may be a cause.<ref name="pmid15874927">{{cite journal |author=Nouraei SA, Al-Rawi PG, Sigaudo-Roussel D, Giussani DA, Gaunt ME |title=Carotid endarterectomy impairs blood pressure homeostasis by reducing the physiologic baroreflex reserve |journal=J. Vasc. Surg. |volume=41 |issue=4 |pages=631–7 |year=2005 |month=April |pmid=15874927 |doi=10.1016/j.jvs.2005.01.009 |url=http://linkinghub.elsevier.com/retrieve/pii/S0741521405000315 |issn=}}</ref><ref name="pmid18095499">{{cite journal |author=Azuma Y, Imai K, Oda K, Niwa F, Makino M, Oshima F |title=[Case of baroreflex failure after bilateral revascularization of the cervical carotid artery] |language=Japanese |journal=Rinsho Shinkeigaku |volume=47 |issue=10 |pages=657–61 |year=2007 |month=October |pmid=18095499 |doi= |url= |issn=}}</ref> | |||
However, orthostasis may be improved by [[endarterectomy]]<ref name="pmid8685922">{{cite journal |author=Hirschl M, Kundi M, Blazek G |title=Five-year follow-up of patients after thromboendarterectomy of the internal carotid artery: Relevance of baroreceptor sensitivity |journal=Stroke |volume=27 |issue=7 |pages=1167–72 |year=1996 |month=July |pmid=8685922 |doi= |url=http://stroke.ahajournals.org/cgi/pmidlookup?view=long&pmid=8685922 |issn=}}</ref> if there is "vasodepressor-type carotid sinus syndrome caused by compression of the carotid baroreceptors by atherosclerotic plaques."<ref name="pmid10193149">{{cite journal |author=Akiyama Y, Hashimoto N, Morimoto M |title=Orthostatic hypotension improved after bilateral carotid endarterectomy--case report |journal=Neurol. Med. Chir. (Tokyo) |volume=39 |issue=2 |pages=153–6 |year=1999 |month=February |pmid=10193149 |doi= |url=http://joi.jlc.jst.go.jp/JST.Journalarchive/nmc1959/39.153?from=PubMed |issn=}}</ref> | |||
==References== | ==References== | ||
<references/> | <references/> | ||
Revision as of 22:58, 24 February 2009
In medicine, orthostatic hypotension is "a significant drop in blood pressure after assuming a standing position. Orthostatic hypotension is a finding, and defined as a 20-mm hg decrease in systolic pressure or a 10-mm hg decrease in diastolic pressure 3 minutes after the person has risen from supine to standing. Symptoms generally include dizziness, blurred vision, and syncope."[1]
Causes
Endarterectomy of the internal carotid artery may be a cause.[2][3]
However, orthostasis may be improved by endarterectomy[4] if there is "vasodepressor-type carotid sinus syndrome caused by compression of the carotid baroreceptors by atherosclerotic plaques."[5]
References
- ↑ Anonymous (2024), Orthostatic hypotension (English). Medical Subject Headings. U.S. National Library of Medicine.
- ↑ Nouraei SA, Al-Rawi PG, Sigaudo-Roussel D, Giussani DA, Gaunt ME (April 2005). "Carotid endarterectomy impairs blood pressure homeostasis by reducing the physiologic baroreflex reserve". J. Vasc. Surg. 41 (4): 631–7. DOI:10.1016/j.jvs.2005.01.009. PMID 15874927. Research Blogging.
- ↑ Azuma Y, Imai K, Oda K, Niwa F, Makino M, Oshima F (October 2007). "[Case of baroreflex failure after bilateral revascularization of the cervical carotid artery]" (in Japanese). Rinsho Shinkeigaku 47 (10): 657–61. PMID 18095499. [e]
- ↑ Hirschl M, Kundi M, Blazek G (July 1996). "Five-year follow-up of patients after thromboendarterectomy of the internal carotid artery: Relevance of baroreceptor sensitivity". Stroke 27 (7): 1167–72. PMID 8685922. [e]
- ↑ Akiyama Y, Hashimoto N, Morimoto M (February 1999). "Orthostatic hypotension improved after bilateral carotid endarterectomy--case report". Neurol. Med. Chir. (Tokyo) 39 (2): 153–6. PMID 10193149. [e]