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Table 2 Fetal echo cardiac structures observed by echocardiography at different gestational ages investigated by 2D

From: First trimester fetal echocardiography limitations and its expected clinical values

 Gestational age (weeks)
10th11th12th13th18th
Four chamber view184 (94.8%)188 (96.9%)194 (100.0%)194 (100.0%)194 (100.0%)
Cardiac axis144 (74.2%)186 (95.9%)194 (100.0%)194 (100.0%)194 (100.0%)
Ventricular inflow189 (97.4%)192 (99.0%)194 (100.0%)194 (100.0%)194 (100.0%)
TI0.29 ± 0.10.31 ± 0.110.23 ± 0.090.22 ± 0.100.25 ± 0.1
MI0.87 ± 0.150.92 ± 0.211.1 ± 0.271.2 ± 0.280.7 ± 0.2
Average ultrasound time22.5 ± 12.2729.3 ± 10.2728.7 ± 9.4531.2 ± 9.2532.4 ± 8.75