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Removal of cardiac beat artifact in oesophageal pressure measurement by frequency analysis

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Abstract

Oesophageal pressure (Pes) measurements are important in medical research and useful in clinical diagnosis. Measurements, however, are contaminated heavily by cardiac artifacts. The spectrum and waveform of the Pes signal is obtained from the oesophageal balloon. Adaptive finite impulse response (AFIR) filter and modified adaptive noise cancellation (MANC) methods are adopted to filter out cardiac beat interference. These results are compared. In the frequency domain, frequency variations and spectral overlap between the Pes components and cardiac beat signal components impact on the performance of the filter. From our experimental results on power strength, the fourth or higher harmonics did not have any significant effect on the filter performance. However, the second harmonics of these signals had a significant effect on the filtering result. Thus, in the design of AFIR filters, attention is needed to minimise these effects. In frequency analysis, these harmonics or overlapping frequencies do not affect MANC. MANC was the better method for eliminating cardiac beat artifact in Pes measurement. The dynamic compliance (Cdyn) was also used to evaluate the performance of MANC and AFIR. The standard deviation of Cdyn was less than 0.15 using MANC, compared with standard deviations as high as 0.57 for AFIR. We conclude that MANC performs better than AFIR.

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Abbreviations

w c :

Cutoff frequency

P es :

Oesophageal pressure [cm H2O]

LPF:

Lowpass filter

BSF:

Bandstop filter

CF:

Comb filter

f r1 :

Frequency ofP es fundamental wave

f r2 :

Frequency of second harmonic ofP es

f r3 :

Frequency of third harmonic ofP es

f c1 :

Frequency of cardiac beat fundamental wave

f c2 :

Frequency of second harmonic of cardiac beat

f c3 :

Frequency of third harmonic of cardiac beat

f c4 :

Frequency of fourth harmonic of cardiac beat

P r1 :

Power ofP es fundamental wave

P r2 :

Power of second harmonic ofP es

P r3 :

Power of third harmonic ofP es

P c1 :

Power of cardiac beat fundamental wave

P c2 :

Power of second harmonic of cardiac beat

P c3 :

Power of third harmonic of cardiac beat

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Authors and Affiliations

  1. Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan

    Y. P. Cheng & G. J. Jan

  2. Department of Diagno-therapeutics, National Taiwan University Hospital, Taipei, Taiwan

    H. D. Wu

  3. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan

    C. Y. Wang

Authors
  1. Y. P. Cheng
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  2. H. D. Wu
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  3. C. Y. Wang
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  4. G. J. Jan
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Correspondence to Y. P. Cheng.

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Cheng, Y.P., Wu, H.D., Wang, C.Y. et al. Removal of cardiac beat artifact in oesophageal pressure measurement by frequency analysis. Med. Biol. Eng. Comput. 37, 776–783 (1999). https://doi.org/10.1007/BF02513381

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  • DOI: https://doi.org/10.1007/BF02513381

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