SYNTHESIZED CARDIAC WAVEFORM IN THE EVALUATION OF AUGMENTATION INDEX ALGORITHMS - Case Study for a New Wavelet based Algorithm

Vânia Almeida, Tânia Pereira, Elisabeth Borges, Edite Figueiras, João Cardoso, Carlos Correia, Helena Catarina Pereira, José Luís Malaquias, J. Basílio Simões

Abstract

We developed and tested the performance of a new wavelet based algorithm for Augmentation Index (AIx) determination. The evaluation method relies on reference cardiac-like pulses that are synthesized using a weighted combination of exponentially shaped sub-pulses that represent the three main components of real pulses: the systolic stroke, its reflected replica and the carotid reservoir or windkessel effect. The pulses are parameterized so as to reproduce the main types of cardiac waveforms. The values of AIx yielded by the new algorithm are compared with the ones computed directly from the synthesized waveform and with the values produced by standard Probability Density Function (PDF) analysis.

References

  1. Chen, C.H., Nevo, E. Fetics, B., Pak, P.H., Yin, F.C,. Maughan, W.L., Kass D.A. (1997). Estimation of Central Aortic Pressure Waveform by Mathematical Transformation of Radial Tonometry Pressure, Circulation, 95, 1827-1836
  2. De Melis, M., Morbiducci, U., Rietzschel E.R., De Buyzere, M., Qasem, A., Van Bortel L., Claessens T., Montevecchi F.M., Avolio A., Segers P. (2009). Blood pressure waveform analysis by means of wavelet transform, Med Biol Eng Comp, 47, 165-173.
  3. Feng J., Khir, A.W. (2007). Determination of wave intensity in flexible tubes using measured diameter and velocity Proceedings of the 29th Annual International Conference of the IEEE EMBS, 15, 985- 988
  4. Hermeling E., Reesink K.D., Reneman R.S., Hoeks A.P. (2007), Measurement of local pulse wave velocity: effects of signal processing on precision, Ultrasound in Med. & Biol., 33(5), 774-781
  5. Hope, S., Tay, D.B., Meredith, I.T., Cameron, J.D. (2002), Comparison of generalized and gender-specific transfer functions for the derivation of aortic waveforms, Am J Physiol Heart Circ Physiol, 283, H1150-H1156.
  6. Hope, S., Tay, D.B., Meredith, I.T., Cameron, J.D. (2004). Use of Arterial Transfer Functions for the Derivation of Central Aortic Waveform Characteristics in Subjects With Type 2 Diabetes and Cardiovascular Disease, Diabetes Care, 27 (3), 746-751
  7. Khir, A.W., Parker, K.H. (2002), Measurements of wave speed and reflected waves in elastic tubes and bifurcations, Journal of Biomechanics, 35, 775-783.
  8. McConnell, K.B., Wagner M., Urbina, E., Daniels, S., Helmicki, A., Hunt, V., Amin, R.S., (2004). Central Aortic Pressure Wave Changes with Sleep Stage and Disordered Breathing in Children Estimated by Application of an Arterial Transfer Function to Peripheral Blood Pressure, Proceedings of the 26th Annual International Conference of the IEEE EMBS, 3864-3866
  9. Murgo, J.P.,Westerhof, N.,Giolma J.P., Altobelli, S.A. (1980), Aortic input impedance in normal man: relationship to pressure wave forms. Circulation, 62, 105-116
  10. Olufsen, M. (1999). Structured tree outflow condition for blood flow in larger systemic arteries. Am J Physiol Heart Circ Physiol , 276, 257-268.
  11. Swillens, A., Segers, P. (2008). Assessment of arterial pressure wave reflection: Methodological considerations. Artery Research, 2 (4), 122-131
  12. Rubins, U. 2008. Finger and ear photoplethysmogram waveform analysis by fitting with Gaussians, Med Biol Eng Comput, 46, 1271-1276.
  13. Tsui, P.H., Lin, L.Y., Chan, C.C., Hwang, J.J, Lin, J.J., Chu, C.C, Chen, C.N., Chang, K.J., Chang, C.C. (2007). Arterial pulse waveform analysis by the probability distribution of amplitude. Physiol.Means, 28, 803-812.
Download


Paper Citation


in Harvard Style

Almeida V., Pereira T., Borges E., Figueiras E., Cardoso J., Correia C., Catarina Pereira H., Luís Malaquias J. and Basílio Simões J. (2010). SYNTHESIZED CARDIAC WAVEFORM IN THE EVALUATION OF AUGMENTATION INDEX ALGORITHMS - Case Study for a New Wavelet based Algorithm . In Proceedings of the Third International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2010) ISBN 978-989-674-018-4, pages 385-388. DOI: 10.5220/0002691703850388


in Bibtex Style

@conference{biosignals10,
author={Vânia Almeida and Tânia Pereira and Elisabeth Borges and Edite Figueiras and João Cardoso and Carlos Correia and Helena Catarina Pereira and José Luís Malaquias and J. Basílio Simões},
title={SYNTHESIZED CARDIAC WAVEFORM IN THE EVALUATION OF AUGMENTATION INDEX ALGORITHMS - Case Study for a New Wavelet based Algorithm},
booktitle={Proceedings of the Third International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2010)},
year={2010},
pages={385-388},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0002691703850388},
isbn={978-989-674-018-4},
}


in EndNote Style

TY - CONF
JO - Proceedings of the Third International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2010)
TI - SYNTHESIZED CARDIAC WAVEFORM IN THE EVALUATION OF AUGMENTATION INDEX ALGORITHMS - Case Study for a New Wavelet based Algorithm
SN - 978-989-674-018-4
AU - Almeida V.
AU - Pereira T.
AU - Borges E.
AU - Figueiras E.
AU - Cardoso J.
AU - Correia C.
AU - Catarina Pereira H.
AU - Luís Malaquias J.
AU - Basílio Simões J.
PY - 2010
SP - 385
EP - 388
DO - 10.5220/0002691703850388