Key result
Vacuum extraction is linked to higher RMSSD and SDNN, indicating temporarily elevated vagal tone.
Why the study?
Does vacuum extraction delivery impact cardiac autonomic balance in full term AGA human infants?
Cohort (n=101)
Does vacuum extraction delivery impact cardiac autonomic balance in full term AGA human infants?
p-value: p=0.01
Vacuum extraction delivery is associated with a temporary elevation of cardiac vagal tone persisting until at least two weeks postnatal age in full-term infants.
Delivery mode may transiently affect neonatal autonomic balance; leaves open long-term cardiovascular relevance and need for prospective studies.
The impact of delivery mode on the cardiac autonomic balance was studied in a sample of 101 full term appropriate for gestational age (AGA) human infants. Cardiac autonomic balance was measured by assessing basic heart rate, and two indicators of vagal tone, the Root Mean Square of Successive Differences (RMSSD) and Standard Deviation of NN-intervals (SDNN) as two different measures of short-term heart rate variability at 2, 6, and 16 weeks postnatal age. Sixty-seven infants were delivered spontaneously, 29 by cesarean section and five by vacuum extraction. Children delivered by vacuum extraction had a significantly lower basic heart rate (P=0.01), higher RMSSD (P=0.0003) and higher SDNN (P=0.0001) at two, but not at six and sixteen weeks, indicating a temporary elevation of cardiac vagal tone in these infants. These data indicate a potential transitory impact of vacuum extraction on autonomic balance persisting until at least two weeks postnatal age.
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Moehler et al. (2007) conducted a cohort in Healthy full term infants (n=101). Vacuum extraction vs. Spontaneous delivery or cesarean section was evaluated on Cardiac autonomic balance (basic heart rate, RMSSD, and SDNN) (p=0.01). Vacuum extraction was associated with a lower basic heart rate (P=0.01), higher RMSSD (P=0.0003), and higher SDNN (P=0.0001) at two weeks postnatal age, indicating temporarily elevated vagal tone.
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