| beat-to-beat variability | Variability of foetal heart rate measured in changes in the QRS-QRS interval from heart beat to heart beat; measured with electronic internal foetal heart rate monitors. Continuous variation, a series of very slight variation's. (05 Mar 2000) |
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| baseline variability of foetal heart rate | The beat-to-beat changes in foetal heart rate as recorded on a graph. (05 Mar 2000) |
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| variability | The state of being variable. (18 Nov 1997) |