Use of chest circumference signal as an input to models of Respiration-HRV interaction
Küçük Resim Yok
Tarih
2007
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
SPRINGER-VERLAG BERLIN
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 (V-L), intrathoracic pressure (P-T), and abdominal pressure (P-A), 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 V-L, P-T, and P-A 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 (C-T and C-A respectively) are easier to acquire without inducing stress. It is shown that by appropriately scaling and offsetting C-T and C-A one obtains signals representative of P-T and P-A which then can be used as inputs to the models. V-L can also be derived from P-T, through a linear empirical formula published elsewhere. C-T, C-A, and V-L from 5 volunteers are recorded together with ECG. It is shown that C-T is linearly related to V-L, and hence to P-T. The derived P-T and P-A 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.
Açıklama
World Congress on Medical Physics and Biomedical Engineering -- AUG 27-SEP 01, 2006 -- Seoul, SOUTH KOREA
Anahtar Kelimeler
Heart rate variability, Respiration, Physiological modeling, Chest circumference, Simulation
Kaynak
WORLD CONGRESS ON MEDICAL PHYSICS AND BIOMEDICAL ENGINEERING 2006, VOL 14, PTS 1-6
WoS Q Değeri
N/A
Scopus Q Değeri
Cilt
14
