TY - GEN
T1 - Non-invasive evaluation of opening and closing timings of the cardiac valves in the fetal cardiac cycle
AU - Khandoker, A. H.
AU - Kimura, Y.
AU - Ito, T.
AU - Sato, N.
AU - Okamura, K.
AU - Palaniswami, M.
PY - 2008
Y1 - 2008
N2 - In this study, we propose a non-invasive system to recognize the timings of fetal cardiac events on the basis of analysis of fetal ECG and Doppler ultrasound signal together. Fetal ECG was extracted from transabdominal ECG (10 normal subjects, 38-41 weeks of gestation) using blind source separation with the reference signal. Multiresolution wavelet analysis enabled the frequency contents of the Doppler signals to be linked to the opening(o) and closing(c) of the heart's valves (Aortic (A) and mitral(M)). M-mode, B-mode and pulsed Doppler ultrasound were used to examine and verify the timings of opening and closure of aortic as well as mitral valves. The time intervals from Q-wave of QRS complex of fetal ECG to opening and closing of aortic valve, i.e. Q-Ao and Q-Ac were found to be 75.0±11.9 (msec) and 221.6±29.0 (msec) respectively. As for the mitral valve, Q-Mc and Q-Mo were found to be 45.0±18.9 (msec) and 301.6±20.7 (msec) respectively.
AB - In this study, we propose a non-invasive system to recognize the timings of fetal cardiac events on the basis of analysis of fetal ECG and Doppler ultrasound signal together. Fetal ECG was extracted from transabdominal ECG (10 normal subjects, 38-41 weeks of gestation) using blind source separation with the reference signal. Multiresolution wavelet analysis enabled the frequency contents of the Doppler signals to be linked to the opening(o) and closing(c) of the heart's valves (Aortic (A) and mitral(M)). M-mode, B-mode and pulsed Doppler ultrasound were used to examine and verify the timings of opening and closure of aortic as well as mitral valves. The time intervals from Q-wave of QRS complex of fetal ECG to opening and closing of aortic valve, i.e. Q-Ao and Q-Ac were found to be 75.0±11.9 (msec) and 221.6±29.0 (msec) respectively. As for the mitral valve, Q-Mc and Q-Mo were found to be 45.0±18.9 (msec) and 301.6±20.7 (msec) respectively.
UR - http://www.scopus.com/inward/record.url?scp=62249162194&partnerID=8YFLogxK
U2 - 10.1109/CIC.2008.4749228
DO - 10.1109/CIC.2008.4749228
M3 - Conference contribution
AN - SCOPUS:62249162194
SN - 1424437067
SN - 9781424437061
T3 - Computers in Cardiology
SP - 1061
EP - 1064
BT - Computers in Cardiology 2008, CAR
T2 - Computers in Cardiology 2008, CAR
Y2 - 14 September 2008 through 17 September 2008
ER -