Cerebral aneurysms have distinct sounds that peak at a frequency between 260–660Hz, very different from the spectrum without aneurysms . While this phenomenon has been known for years, the exact cause of bruits is not known. Figure 1 shows the spectrums of sounds from a healthy subject and a 65-year-old patient with a 16mm aneurysm at the paraclinoid segment of the internal carotid artery using a digital electronic stethoscope. The healthy subject has a peak at 96Hz, and the spectrum for the aneurysm patient peaks at 403 Hz.
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Mechanism of Cerebral Aneurysm Bruits: Resonance of Parent Artery and Aneurysm
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Jou, L, Morsi, H, & Mawad, ME. "Mechanism of Cerebral Aneurysm Bruits: Resonance of Parent Artery and Aneurysm." Proceedings of the ASME 2008 Summer Bioengineering Conference. ASME 2008 Summer Bioengineering Conference, Parts A and B. Marco Island, Florida, USA. June 25–29, 2008. pp. 1087-1088. ASME. https://doi.org/10.1115/SBC2008-192853
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