Time-frequency analysis of the ECG in the diagnosis of vasovagal syndrome in older people.

Journal article

The Smoothed Pseudo Wigner-Ville Distribution (SPWVD) is used for the time-frequency analysis of variations in RR interval. A novel technique to determine the smoothing window lengths is implemented, and a new heart rate variability (HRV) metric is developed, instantaneous center frequency variability (ICFV), which uses the time-frequency map generated by the SPWVD. The technique is then applied to 50 patients with unexplained falls and age > 60, undergoing head-upright tilt table testing (HUT). Eighteen of the patients were diagnosed with vasovagal syndrome. Attempts at syncope prediction using the new metric is an improvement on traditional techniques: an ICFV less than 0.07 Hz from 90 s to 180 s after tilt is predictive of a negative test (negative predictive value: 0.77). The comorbidity and autonomic degeneration present in elderly patients are thought to be responsible for lowering the negative predictive value.

Authors: Ebden, M; Tarassenko, L; Payne, S; Darowski, A; Price, J

• Publication status: Published
• Journal: Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
• Volume: 1
• Pages: 290-293
• Publication date: 2004-01-01
• DOI: 10.1109/iembs.2004.1403149
• ISSN: 1557-170X
• Language: English
• Keywords: SPWVD; smoothed pseudo Wigner-Ville distribution; ICF; vasovagal syncope; instantaneous center frequency