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Citation:
Carroll D, Westin G, Lindegaard ratio. Reference article, Radiopaedia.org (Accessed on 01 Jun 2023) https://doi.org/10.53347/rID-89908
The Lindegaard ratio refers to the calculated ratio of the mean flow velocities in the middle cerebral artery and the ipsilateral extracranial internal carotid artery, as measured by transcranial Doppler 1. Its primary utility is, in the context of increased MCA velocities after subarachnoid hemorrhage, to confirm the presence of vasospasm.
Interpretation
A Lindegaard ratio above 3 supports the diagnosis of vasospasm in the presence of an increased MCA mean flow velocity, with a ratio above 6 classified as severe 2. A ratio of less than 3 may indicate the presence of an alternate etiology to the increased flow velocities measured, including 3:
- cerebral hyperemia
- hypertension
- hypervolemia
- 1. Mira L. Katz, Andrei V. Alexandrov. A Practical Guide to Transcranial Doppler Examinations. (2003) ISBN: 9780972065313
- 2. Montrief T, Montrief AS, Montrief JC, Montrief SJ, Montrief. Incorporation of Transcranial Doppler into the ED for the neurocritical care patient. (2019) The American journal of emergency medicine. doi:10.1016/j.ajem.2019.03.003 - Pubmed
- 3. Kirsch JD, Mathur M, Johnson MH, Gowthaman G, Scoutt LM. Advances in transcranial Doppler US: imaging ahead. (2013) Radiographics : a review publication of the Radiological Society of North America, Inc. 33 (1): E1-E14. doi:10.1148/rg.331125071 - Pubmed
- 4. Lindegaard K, Lindegaard NH, Lindegaard BS, Lindegaard SW, Lindegaard NP, Lindegaard. Cerebral vasospasm diagnosis by means of angiography and blood velocity measurements. (1989) Acta neurochirurgica. doi:10.1007/BF01405268 - Pubmed
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