妊娠18 ~ 40周低风险胎儿直肠壶腹部内径与孕周的相关性及参考值探索

doi:10.3969/j.issn.1006-5725.2025.06.017

Abstract

Abstract:

Objective To examine the correlation between fetal rectal ampulla diameter and gestational age， and to establish reference value ranges for low-risk fetuses between 18 and 40 weeks of gestation in Yibin region. Methods A total of 1，103 low-risk singleton pregnant women between 18 and 40 weeks of gestation were recruited from five hospitals in Yibin City （the Second People′s Hospital， the First People′s Hospital， the Fifth People′s Hospital， the Maternal and Child Health Hospital of Yibin City， and the Maternal and Child Health Hospital of Cuiping District） for routine level Ⅰ， Ⅱ， and Ⅲ prenatal ultrasound screening from October 2022 to March 2024. Fetal rectal ampulla diameters， including anteroposterior diameter， transverse diameter， and area， were measured using prenatal ultrasound. The normality of these measurements was assessed using the Shapiro-Wilk test. Scatter plots depicting the relationship between fetal rectal ampulla diameter parameters and gestational age were generated using the "Overlap Scatter Plot" function in SPSS. Percentiles were calculated using the "Explore" function in SPSS， with reference value ranges described by P5， P10， P50， P90， and P95. Results The visualization rate of the fetal rectal ampulla diameter was 55% at 18 ~ 20 weeks of gestation， 100% at 21 ~ 37 weeks， and 96% at greater than 37 weeks. The fetal rectal ampulla diameter exhibited a significant positive correlation with gestational age （r = 0.925 ~ 0.949， P < 0.01）. Conclusions Prenatal ultrasound measurement of fetal rectal ampulla diameter demonstrates a robust correlation with gestational age. The reference intervals for the rectal ampulla diameter of low-risk fetuses between 18 and 40 weeks of gestation， established in this study， may offer valuable theoretical guidance for prenatal diagnosis of fetal rectal and anal abnormalities in Yibin region.

Key words: different gestational ages of fetuses, rectal saccular abdomen, reference value ranges, correlation, Yibin

CLC Number:

R714.5

Yuqi ZHANG,Kesong ZHOU,Shiquan ZHANG,Lei TANG,Enxiu XIE,Hongquan LIAO,Tao. YANG. Correlation of fetal rectal ampulla abdominal diameter with gestational age and establishment of reference values in low⁃risk fetuses at 18 ~ 40 weeks of pregnancy[J]. The Journal of Practical Medicine, 2025, 41(6): 882-888.

Figures/Tables 7

Fig.1

Tab.1

Tab.2

Percentile reference values for rectal ampulla size parameters of low-risk fetuses at 18 ~ 40 weeks gestation"

孕周	样本量	直肠壶腹部前后径/cm					直肠壶腹部左右径/cm					直肠壶腹部面积/mm²
孕周	样本量	P5	P10	P50	P90	P95	P5	P10	P50	P90	P95	P5	P10	P50	P90	P95
18	40	0.231	0.241	0.310	0.540	0.656	0.271	0.281	0.385	0.668	0.710	0.061	0.070	0.100	0.302	0.388
19	41	0.331	0.350	0.400	0.466	0.479	0.342	0.370	0.420	0.478	0.526	0.121	0.152	0.180	0.238	0.277
20	31	0.316	0.330	0.380	0.696	0.722	0.356	0.360	0.420	0.618	0.650	0.110	0.120	0.140	0.420	0.526
21	31	0.396	0.420	0.470	0.540	0.560	0.486	0.490	0.530	0.568	0.608	0.176	0.182	0.220	0.280	0.330
22	109	0.415	0.440	0.550	0.660	0.680	0.500	0.510	0.680	0.820	0.875	0.190	0.200	0.310	0.420	0.480
23	214	0.340	0.380	0.520	0.690	0.740	0.568	0.610	0.740	0.900	0.953	0.208	0.240	0.350	0.500	0.523
24	133	0.354	0.394	0.550	0.740	0.792	0.598	0.634	0.770	0.906	0.963	0.237	0.254	0.370	0.566	0.600
25	44	0.383	0.420	0.625	0.770	0.780	0.625	0.695	0.850	0.980	1.100	0.310	0.320	0.480	0.600	0.628
26	41	0.524	0.568	0.790	0.880	0.916	0.870	0.880	0.950	1.256	1.387	0.531	0.542	0.650	0.730	0.919
27	31	0.792	0.900	1.050	1.118	1.142	0.980	0.982	1.160	1.218	1.254	0.852	0.896	1.020	1.128	1.134
28	31	0.884	0.982	1.070	1.258	1.308	1.052	1.090	1.180	1.298	1.362	0.772	0.910	1.020	1.224	1.584
29	31	1.036	1.050	1.090	1.226	1.262	1.072	1.172	1.260	1.364	1.394	1.050	1.090	1.130	1.266	1.292
30	31	0.722	0.750	1.090	1.190	1.220	0.762	0.822	1.210	1.260	1.320	0.668	0.732	1.070	1.214	1.440
31	31	0.976	1.102	1.190	1.274	1.312	1.002	1.116	1.310	1.388	1.432	0.982	1.098	1.190	1.322	1.350
32	23	0.904	1.000	1.170	1.332	1.404	1.022	1.078	1.230	1.444	1.476	0.842	0.986	1.140	1.530	1.686
33	41	0.903	1.152	1.500	1.674	1.753	1.141	1.200	1.600	1.748	1.796	1.006	1.212	2.000	2.418	2.494
34	31	0.948	1.052	1.390	1.500	1.628	0.966	1.246	1.500	1.590	1.644	0.840	1.170	1.380	2.180	2.352
35	21	0.834	1.010	1.460	1.690	1.726	1.411	1.440	1.680	1.856	1.870	1.402	1.440	1.650	2.382	2.985
36	31	0.936	1.018	1.390	1.624	1.654	0.790	0.868	1.610	1.758	1.860	0.630	0.658	1.620	2.386	2.572
37	41	0.962	1.100	1.510	1.698	1.748	1.478	1.582	1.700	1.830	1.946	1.432	1.570	1.870	2.600	2.719
38	31	1.400	1.494	1.720	1.975	2.040	1.582	1.676	1.850	2.024	2.076	2.012	2.082	2.550	3.274	3.406
39	21	1.563	1.596	1.900	2.036	2.076	1.731	1.760	1.960	2.106	2.164	1.881	1.892	2.580	3.258	3.604
40	24	1.425	1.615	1.970	2.030	2.053	1.838	1.865	1.990	2.090	2.123	1.878	1.900	2.030	2.625	2.798

Tab.2

Fig.2

Fig.3

Fig.4

Tab.3

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孕周	样本量	P值
孕周	样本量	前后径	左右径	面积
18	40	< 0.001	< 0.001	< 0.001
19	41	< 0.001	< 0.001	0.003
20	31	< 0.001	0.001	< 0.001
21	31	0.281^*	0.088^*	0.001
22	109	0.071^*	0.078^*	0.001
23	214	0.095^*	0.354^*	< 0.001
24	133	0.021	0.657^*	< 0.001
25	44	0.165^*	0.610^*	0.206^*
26	41	0.006	< 0.001	< 0.001
27	31	0.002	0.017	0.282^*
28	31	0.077^*	0.126^*	< 0.001
29	31	0.003	0.009	0.003
30	31	< 0.001	< 0.001	0.004
31	31	0.001	< 0.001	< 0.001
32	23	0.616^*	0.941^*	0.068^*
33	41	< 0.001	< 0.001	< 0.001
34	31	0.018	< 0.001	0.001
35	21	0.051^*	0.663^*	0.003
36	31	0.127^*	0.001	0.116^*
37	41	0.003	0.441^*	0.024
38	31	0.812^*	0.626^*	0.307^*
39	21	0.072^*	0.550^*	0.012
40	24	< 0.001	0.168^*	0.001

指标	组内相关系数ICC（95% CI）	组间相关系数ICC（95% CI）
直肠壶腹部左右径	0.995（0.990 ~ 0.998）	0.993（0.987 ~ 0.997）
直肠壶腹部前后径	0.990（0.980 ~ 0.995）	0.992（0.985 ~ 0.996）
直肠壶腹部面积	0.997（0.994 ~ 0.999）	0.998（0.996 ~ 0.999）

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Correlation of fetal rectal ampulla abdominal diameter with gestational age and establishment of reference values in low⁃risk fetuses at 18 ~ 40 weeks of pregnancy

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