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Role of admission cardiotocography in predicting the obstetric outcome in term antenatal women: A prospective observational study


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Relationship between admission CTG and perinatal outcome

Groups Parameters Admission CTG
p-value
Reactive Suspicious Ominous
Low-risk Apgar score at 1 minute
≥ 7 46 (97.9%) 1 (50.0%) 1 (50.0%) 0.0005
< 7 1 (2.1%) 1 (50.0%) 1 (50.0%)
Apgar score at 5 minutes
≥ 7 47 (100.0%) 2 (100.0%) 2 (100.0%) No correlation observed
< 7 0 (0%) 0 (0%) 0 (0%)
Neonatal resuscitation
Yes 0 (0%) 0 (0%) 0 (0%) No correlation observed
No 47 (100.0%) 2 (100.0%) 2 (100.0%)
NICU admission
Yes 3 (6.4%) 1 (50.0%) 1 (50.0%) 0.019
No 44 (93.6%) 1 (50.0%) 1 (50.0%)
High-risk Apgar score at 1 minute
≥ 7 17 (85.0%) 12 (75.0%) 5 (38.5%) 0.015
< 7 3 (15.0%) 4 (25.0%) 8 (61.5%)
Apgar score at 5 minutes
≥ 7 20 (100.0%) 16 (100.0%) 13 (100.0%) No correlation observed
< 7 0 (0%) 0 (0%) 0 (0%)
Neonatal resuscitation
Yes 0 (0%) 1 (6.3%) 5 (38.5%) 0.03
No 20 (100.0%) 15 (93.7%) 8 (61.5%)
NICU admission
Yes 3 (15.0%) 5 (31.3%) 10 (76.9%) 0.001
No 17 (85.0%) 11 (68.7%) 3 (23.1%)

Sociodemographic features

Parameters Number (n) Percentage (%)
AGE (YEARS)
≥ 20–< 30 94 94.0%
≥ 30 6 6.0%
REGISTRATION STATUS
Booked 55 55.0%
Unbooked 45 45.0%
GESTATION (WEEKS)
≥ 37–< 40 98 98.0%
≥ 40 2 2.0%
GRAVIDITY
Multigravida 57 57.0%
Primigravida 43 43.0%
CATEGORISATION BASED ON RISK FACTORS
Low-risk group 51 51.0%
High-risk group 49 49.0%

Relationship between the colour of liquor and CTG results in both low- and high-risk pregnancies.

Admission CTG
Meconium Staining Reactive Suspicious Ominous Total p-value
Low risk
Clear 47 (95.9%) 1 (2.04%) 1 (2.04%) 49 <0.001
Meconium-stained 0 (0%) 1 (50.0%) 1 (50.0%) 2
Total 47 (92.2%) 2 (3.9%) 2 (3.9%) 51
High risk
Clear 20 (43.5%) 16 (34.8%) 10 (21.7%) 46 0.018
Meconium-stained 0 (0%) 0 (0%) 3 (100.0%) 3
Total 20 (40.8%) 16 (32.7%) 13 (26.5%) 49

Relationship between the admission CTG results and the mode of delivery in the low-and high-risk groups

Groups
Admission CTG Mode of Delivery Low Risk High Risk Total p-value
Reactive ND 41 (87.2%) 15 (75.0%) 56 (83.6%)
LSCS 2 (4.3%) 1 (5.0%) 3 (4.5%)
Instrumental 4 (8.5%) 4 (20.0%) 8 (11.9%)
Total 47 (100.0%) 20 (100.0%) 67 (100.0%)
Suspicious ND 0(0%) 4 (25.0%) 4 (22.2%)
LSCS 1 (50.0%) 4 (25.0%) 5 (27.8%)
Instrumental 1 (50.0%) 8 (50.0%) 9 (50.0%)
Total 2 (100.0%) 16 (100.0%) 18 (100.0%) 0.0001
Ominous ND 0(0%) 0 (0%) 0 (0%)
LSCS 2 (100.0%) 13 (100.0%) 15 (100.0%)
Instrumental 0(0%) 0 (0%) 0 (0%)
Total 2 (100.0%) 13 (100.0%) 15 (100.0%)
Total ND 41 (80.4%) 19 (38.8%) 60 (60.0%)
LSCS 5 (9.8%) 18 (36.7%) 23 (23.0%)
Instrumental 5 (9.8%) 12 (24.5%) 17 (17.0%)
Total 51(100.0%) 49 (100.0%) 100 (100.0%)

Comparison of sensitivity, specificity, negative and positive predictive value of admission CTG in the prediction of neonatal outcomes between low- and high-risk pregnancies.

Group Parameter Sensitivity (95% CI) Specificity (95% CI) Positive Predictive Value (95% CI) Negative Predictive Value (95% CI)
Low-risk Apgar score at 1-min 50.0% (1.26–98.7%) 97.9% (88.7–99.9%) 50.0% (1.3–98.7%) 97.9% (88.7–99.9%)
NICU Admission 25.0% (0.6–80.6%) 97.8% (88.2–99.9%) 50.0% (1.3–98.7%) 93.6% (82.5–98.7%)
High-risk Apgar score at 1-min 72.7% (39.0–93.9%) 77.3% (54.6–92.2%) 61.5% (31.6–86.1%) 85.0% (62.1–96.8%)
NICU Admission 76.9% (46.2–94.9%) 85.0% (62.1–96.8%) 76.9% (46.2–94.9%) 85.0% (62.1–96.8%)
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