Stroke, Vol 21, 1215-1221, Copyright © 1990 by American Heart Association
LN Sekhar, M Sun, D Bonaddio and RJ Sclabassi
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.
ARTICLES
Acoustic recordings from experimental saccular aneurysms in dogs
Department of Neurological Surgery, University of Pittsburgh, Pa.