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Aims: Fetal actocardiogram (ACG) recorded fetal heart rate (FHR) and movements, to diagnose fetal brain damage by FHR response to fetal movement, to solve controversial problems of cardiotokogram (CTG) and to correctly evaluate fetal states.  Methods: Fetal behavior was determined by 4 ACG parameters, fetal outcome was estimated by the ratio of FHR acceleration duration/fetal movement burst duration (A/B ratio), physiologic sinusoidal FHR was diagnosed by the ACG and FHR frequency spectrum analysis, and the developing mechanism of FHR acceleration and variability were studied to diagnose the brain damage in the loss of FHR variability. Results: The ACG and frequency spectrum analysis separated physiologic sinusoidal FHR from the true one, and controversial problems in CTG were solved by the analysis of ACG. The loss of FHR variability was the sign of fetal brain damage.  Conclusion: The analyses of FHR and fetal movements in ACG were indispensable for correct fetal diagnosis. Since cerebral palsy (CP) will develop in the loss of FHR variability, C-section should be performed before the loss of FHR variability.

SHORT　TITLE：　Fetal actocardiogram