Use of chest circumference signal as an input to models of respiration–HRV interaction
Küçük Resim Yok
Tarih
2007
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer Verlag
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Contributions of respiration to the genesis of Heart Rate Variability are well known. Respiration not only generates the HF (High Frequency) component of the power spectrum of HRV, called respiratory sinus arrhythmia, but also contributes to the formation of the LF (Low Frequency) peak. Therefore it is necessary that respiration is also recorded during an HRV test so that LF/HF ratio, which is the most important parameter extracted from HRV for assessing sympathovagal balance, is more properly evaluated. LF components of lung volume (VL), intrathoracic pressure (PT), and abdominal pressure (PA), are more significant especially when respiration is slightly irregular, and may directly contribute to HRV LF power. Models developed to study these interactions need respiratory signal inputs. Measurements of VL, PT, and PA in a clinical setting are either not possible or induce stress in the patient and thus alter HRV. On the other hand chest and abdominal circumference signals (CT and CA respectively) are easier to acquire without inducing stress. It is shown that by appropriately scaling and offsetting CT and CA one obtains signals representative of PT and PA which then can be used as inputs to the models. VL can also be derived from PT through a linear empirical formula published elsewhere. CT, CA, and VL from 5 volunteers are recorded together with ECG. It is shown that CT is linearly related to VL, and hence to PT. The derived PT and PA signals are then applied to a Respiration-Cardiovascular System model and HRV is derived. It is observed that model derived and real HRVs are temporally well correlated. It is also shown that in the presence of increased LF power of the circumference signals HRV LF power also increases. © International Federation for Medical and Biological Engineering 2007.
Açıklama
AAPM;BMES;EFOMP;et al;IAEA;WHO
10th World Congress on Medical Physics and Biomedical Engineering, WC 2006 -- 27 August 2006 through 1 September 2006 -- 163739
10th World Congress on Medical Physics and Biomedical Engineering, WC 2006 -- 27 August 2006 through 1 September 2006 -- 163739
Anahtar Kelimeler
Chest circumference, Heart rate variability, Physiological modeling, Respiration, Simulation
Kaynak
IFMBE Proceedings
WoS Q Değeri
Scopus Q Değeri
N/A
Cilt
14
Sayı
1
