Orthostatic hypotension

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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]

Orthostatic hypotension is an orthostatic intolerance along with postural orthostatic tachycardia syndrome (POTS)[2][3] and vasovagal syncope.

Causes

Endarterectomy of the internal carotid artery may be a cause.[4][5]

However, orthostasis may be improved by endarterectomy[6] if there is "vasodepressor-type carotid sinus syndrome caused by compression of the carotid baroreceptors by atherosclerotic plaques."[7]

References

  1. ↑ Anonymous, (2009) Orthostatic hypotension (English). Medical Subject Headings. U.S. National Library of Medicine.
  2. ↑ Grubb BP, Karabin B (July 2008). Cardiology patient page. Postural tachycardia syndrome: perspectives for patients. Circulation 118 (3): e61–2. DOI:10.1161/CIRCULATIONAHA.107.761650. PMID 18625897.
  3. ↑ Low PA, Sandroni P, Joyner M, Shen WK (January 2009). Postural Tachycardia Syndrome (POTS). J. Cardiovasc. Electrophysiol.. DOI:10.1111/j.1540-8167.2008.01407.x. PMID 19207771.
  4. ↑ 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.
  5. ↑ 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.
  6. ↑ 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.
  7. ↑ 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.
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