| Quality assessment | Number of babies / number of fetal scalp blood samples | Effect | Quality | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of studies | Design | Limitations | Inconsistency | Indirectness | Imprecision | Other considerations | Marked acidosis | Control | Relative (95% CI) | Absolute (95% CI) | |
| Women with abnormal FBS (pH < 7.20) | |||||||||||
|
1 study | Observational study | No serious risk of bias | No serious inconsistency | Serious1 | No serious imprecision | None |
24/53 (45.3%) |
4/53 (7.5%) | RR 6 (2.23 to 16.11) | 377 more per 1000 (from 93 more to 1000 more) | Very low |
| ST indication to intervenea | |||||||||||
|
1 study | Observational study | No serious risk of bias | No serious inconsistency | Serious1 | No serious imprecision | None |
41/53 (77.4%) |
20/53 (37.7%) | RR 2.05 (1.41 to 2.98) | 396 more per 1000 (from 155 more to 747 more) | Very low |
| No ST indication to intervene (adequately monitored) | |||||||||||
|
1 study | Observational study | No serious risk of bias | No serious inconsistency | Serious1 | No serious imprecision | None |
5/46 (10.9%) |
22/42 (52.4%) | RR 0.21 (0.09 to 0.5) | 414 fewer per 1000 (from 262 fewer to 477 fewer) | Very low |
CI confidence interval, FBS fetal blood sampling, RR relative risk
The ST log automatically notified the staff if any ST events occurred and intervention was required in case of combined CTG and ST changes. Intervention was also indicated by occurrence of preterminal CTG (complete loss of variability and reactivity). No intervention was recommended if CTG was normal, irrespective of the ST wave analysis.
Study population consisted of women with high risk pregnancy, induced labour, augmentation of labour and women with meconium stained liquor
From: Appendix I, GRADE tables
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