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  • Title: [The algorithm of extracting respiratory information from single channel electrocardiogram].
    Author: Zhao J, Hua M.
    Journal: Sheng Wu Yi Xue Gong Cheng Xue Za Zhi; 2006 Dec; 23(6):1202-5. PubMed ID: 17228709.
    Abstract:
    Because the factors of interference in R wave of normal QRS are few except for respiration, the algorithm uses supra ventricular beats in the ECG to extract respiratory signal (EDR) (ECG-derived respiratory signal). The method used here firstly transfers the original single lead ECG signal into the wavelet, then prolongs R amplitudes of supra ventricular beats in the proper scale approximation of wavelet, then the prolonged signal passes a low pass filter, then reduces sample rate to 5 Hz, finally through a band pass filter (0.1-0.4 Hz), the output of the band pass filter is the EDR.
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