Foetal magnetocardiogram amplitude oscillations associated with respiratory sinus arrhythmia

Physiological Measurement - 1995-01-01Wakai RT, Wang M, Leuthold A, Martin CB10.1088/0967-3334/16/1/006
The authors show that oscillations at foetal breathing frequencies observed in foetal heart rate (FHR) tracings obtained from foetal magnetocardiogram (FMCG) recordings are often accompanied by synchronous modulation of FMCG signal amplitude. This implies an association between the FHR oscillations and foetal chest wall movements, corroborating the hypothesis that the oscillations are due to respiratory sinus arrhythmia.