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Annals of Biomedical Engineering

, Volume 36, Issue 12, pp 2085–2094 | Cite as

Comparison of Respiratory Rates Derived from Heart Rate Variability, ECG Amplitude, and Nasal/Oral Airflow

  • Dirk Cysarz
  • Roland Zerm
  • Henrik Bettermann
  • Matthias Frühwirth
  • Maximilian Moser
  • Matthias Kröz
Article

Abstract

It would often be desirable to obtain the respiratory rate during everyday conditions without obtaining an additional respiratory trace. This study investigates the agreement between respiratory rate assessed from the electrocardiogram (ECG) and the reference respiratory rate derived from a nasal/oral airflow (AF). Nasal/oral airflow and a Holter ECG were recorded in 52 healthy subjects (26 males, age range: 25.4–85.4 years) during everyday conditions for at least 10 h, including night-time sleep. The respiratory rate was assessed for each 5-min epoch (1) using respiratory sinus arrhythmia (RSA), (2) utilizing the respiration induced variations of the R-wave amplitude (ECG derived respiration (EDR)). The agreement with respect to AF was quantified using the average/std and the concordance correlation coefficient ρc. For RSA and EDR the difference with respect to AF was 0.2 cpm (std: 0.6 cpm) during sleep and −0.2 cpm (std: 1.0 cpm) during wake time. During sleep the RSA-approach performed best for subjects ≤50 years (ρc = 0.79) and worst for subjects >50 years (ρc = 0.41). The correlation of the EDR-approach was ρc = 0.73 for both groups. In conclusion, the respiratory rate may be assessed with reasonable agreement by both methods in younger subjects, but EDR should be preferred in the elderly.

Keywords

Respiratory rate Heart rate Heart rate variability Respiratory sinus arrhythmia ECG derived respiration Holter ECG 

Notes

Acknowledgments

DC and MK were supported by grants of the Software AG Stiftung, Darmstadt, Germany. DC was also supported by grants of the Rudolf Steiner Fonds, Nürnberg, Germany. RZ and MK acknowledge financial support from the Humanus-Institut e.V., Kandern, Germany.

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Copyright information

© Biomedical Engineering Society 2008

Authors and Affiliations

  • Dirk Cysarz
    • 1
    • 2
  • Roland Zerm
    • 3
    • 4
  • Henrik Bettermann
    • 5
  • Matthias Frühwirth
    • 6
  • Maximilian Moser
    • 6
    • 7
  • Matthias Kröz
    • 3
    • 4
  1. 1.Chair of Medical Theory and Complementary MedicineUniversity of Witten/HerdeckeHerdeckeGermany
  2. 2.Integrated Studies of Anthroposophic MedicineUniversity of Witten/HerdeckeHerdeckeGermany
  3. 3.Research Institute HavelhöheBerlinGermany
  4. 4.Department of General Internal MedicineCommunity Hospital HavelhöheBerlinGermany
  5. 5.Scientific AfricanLuechowGermany
  6. 6.Institute of Non-Invasive DiagnosisJoanneum ResearchWeizAustria
  7. 7.Institute of PhysiologyMedical University GrazGrazAustria

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