[Clinical value of short-term variation of fetal heart rate and its relationship with prenatal outcome].

OBJECTIVE

To study the clinical value of short term variation (STV) of fetal heart rate.

METHODS

Three hundred thirty-eight pregnant women who delivered at our hospital during June 2002 and Dec 2005 were studied. All the cases were examined by non-stress test (NST) and vibratory acoustic stimulation test (VAST). Meanwhile, they were also analyzed by Sonicaid system 8002. One hundred fifty cases with STV >or= 5.0 ms as control group, and 188 cases with STV<5.0 ms as research group were included and divided into different subgroups.

RESULTS

The rate of poor prenatal outcome in STV between <or= 2.9 ms and 3.0 - 3.9 ms groups (8/8, 54.4%) were higher than those in STV between 4.0 - 4.9 ms and control groups (32.2%, 25.3%) (P<0.05). The rate of abnormal non stress test, VAST and type O of long-term variation (LTV) in STV <or= 2.9 ms (8/8, 8/8, and 88.9%) and 3.0 - 3.9 ms groups (8/8, 87.8%, and 91.1%) was more than those in STV 4.0 - 4.9 ms (64.4%, 61.1%, and 31.1%) or STV >or= 5.0 ms groups (66.7%, 17.3%, and 21.3%; P<0.01).

CONCLUSIONS

These is a good relationship between STV and LTV. These is a better relationship between STV<4.0 ms and abnormal NST combining with VAST or fetal distress.