Monotone Signal Segments Analysis as a novel method of breath detection and breath-to-breath interval analysis in rat

Bojic, Tijana (6505762032)Tijana (6505762032)BojicSaponjic, Jasna (57191694110)Jasna (57191694110)SaponjicRadulovacki, Miodrag (7007101470)Miodrag (7007101470)RadulovackiCarley, David W. (7006159093)David W. (7006159093)CarleyKalauzi, Aleksandar (7801322210)Aleksandar (7801322210)Kalauzi2025-06-122025-06-122008https://doi.org/10.1016/j.resp.2008.03.001https://www.scopus.com/inward/record.uri?eid=2-s2.0-43349091219&doi=10.1016%2fj.resp.2008.03.001&partnerID=40&md5=7d1be08830e843b64d29f25a603f444fhttps://remedy.med.bg.ac.rs/handle/123456789/10678We applied a novel approach to respiratory waveform analysis-Monotone Signal Segments Analysis (MSSA) on 6-h recordings of respiratory signals in rats. To validate MSSA as a respiratory signal analysis tool we tested it by detecting: breaths and breath-to-breath intervals; respiratory timing and volume modes; and changes in respiratory pattern caused by lesions of monoaminergic systems in rats. MSSA differentiated three respiratory timing (tachypneic, eupneic, bradypneic-apneic), and three volume (artifacts, normovolemic, hypervolemic-sighs) modes. Lesion-induced respiratory pattern modulation was visible as shifts in the distributions of monotone signal segment amplitudes, and of breath-to-breath intervals. Specifically, noradrenergic lesion induced an increase in mean volume (p ≤ 0.03), with no change of the mean breath-to-breath interval duration (p ≥ 0.06). MSSA of timing modes detected noradrenergic lesion-induced interdependent changes in the balance of eupneic (decrease; p ≤ 0.02), and tachypneic (an increase; p ≤ 0.02) breath intervals with respect to control. In terms of breath durations within each timing mode, there was a tendency toward prolongation of the eupneic (p ≤ 0.08) and bradypneic-apneic (p ≤ 0.06) intervals. These results demonstrate that MSSA is sensitive to subtle shifts in respiratory rhythmogenesis not detectable by simple respiratory pattern descriptive statistics. MSSA represents a potentially valuable new tool for investigations of respiratory pattern control. © 2008 Elsevier B.V. All rights reserved.Breath detectionBreath-to-breath intervalMonoaminergic lesionMonotone Signal Segments AnalysisRatRespiratory pattern modulationMonotone Signal Segments Analysis as a novel method of breath detection and breath-to-breath interval analysis in rat