Sekhar L N, Sun M, Bonaddio D, Sclabassi R J
Department of Neurological Surgery, University of Pittsburgh, Pa.
Stroke. 1990 Aug;21(8):1215-21. doi: 10.1161/01.str.21.8.1215.
In an effort to isolate and characterize the emission of acoustic signals from saccular aneurysms, we made a series of invasive microphone recordings from experimental aneurysms created on the common carotid arteries of dogs using the vein pouch technique. Using a modified probe microphone, we compared recordings from the common carotid artery before creation of the aneurysm to recordings from the aneurysmal surface, both before and after clip occlusion. We then performed spectral analysis, band-pass filtering, and spectrographic analysis to compare the dominant frequency and width of the frequency range of both the aneurysmal and carotid recorded signals. The aneurysmal signals had a significantly higher dominant frequency (p less than or equal to 0.05) and a significantly wider frequency range (p less than or equal to 0.05) than the carotid signals. Aneurysmal signals recorded under conditions of systemic hypotension had a significantly lower frequency (p less than or equal to 0.05) than aneurysmal signals recorded under conditions of hypertension. Our results support the assumptions that acoustic signals from experimental saccular aneurysms are distinct from those of the parent vessel and that the aneurysmal signal can be characterized using passive microphone recordings.
为了分离和表征囊状动脉瘤发出的声学信号，我们使用静脉囊技术对狗颈总动脉上创建的实验性动脉瘤进行了一系列侵入性麦克风记录。使用改良的探头麦克风，我们比较了动脉瘤创建前颈总动脉的记录与动脉瘤表面在夹闭前后的记录。然后，我们进行了频谱分析、带通滤波和频谱分析，以比较动脉瘤和颈动脉记录信号的主频和频率范围宽度。动脉瘤信号的主频显著高于颈动脉信号（p小于或等于0.05），频率范围也显著更宽（p小于或等于0.05）。在系统性低血压条件下记录的动脉瘤信号频率显著低于高血压条件下记录的动脉瘤信号（p小于或等于0.05）。我们的结果支持以下假设：实验性囊状动脉瘤发出的声学信号与母血管的信号不同，并且动脉瘤信号可以通过被动麦克风记录来表征。
