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The effect of behavioral states on fetal heart rate and middle cerebral artery flow‐velocity waveforms in normal full‐term fetuses
Author(s) -
Shono M.,
Shono H.,
Ito Y.,
Muro M.,
Uchiyama A.,
Sugimori H.
Publication year - 1997
Publication title -
international journal of gynecology and obstetrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 97
eISSN - 1879-3479
pISSN - 0020-7292
DOI - 10.1016/s0020-7292(97)00102-1
Subject(s) - medicine , middle cerebral artery , fetus , cardiology , heart rate , fetal heart rate , gestation , anesthesia , pregnancy , blood pressure , ischemia , biology , genetics
Objectives: To evaluate the effect of fetal behavioral states on the relationship between fetal heart rate (FHR) and middle cerebral artery resistance index (MCA RI) in normal fetuses. Methods: The FHR and MCA RI of 10 normal cases from 37 to 40 weeks of gestation were recorded consecutively over a 45‐min period. Correlations between the MCA RI and FHR during resting and active phases, classified by an actocardiotocogram, were analyzed by simple regression analysis. Results: The mean FHR and MCA RI were significantly higher during the active phase (140.3 ± 6.6 bpm, 0.79 ± 0.06) than those during the resting phase (137.4 ± 6.8 bpm, 0.75 ± 0.07, P < 0.01, two sample t‐test). There was a significant negative correlation (r = −0.22, n = 2642, P < 0.01) between RI and FHR during the active phase and a significant positive correlation (r = 0.28, n = 2066, P < 0.001) during the resting phase. Conclusions: The relationship between FHR and the MCA RI during the resting phase is different from during the active phase.