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Erschienen in: BMC Pediatrics 1/2019

Open Access 01.12.2019 | Research article

Probiotics may not prevent the deterioration of necrotizing enterocolitis from stage I to II/III

verfasst von: Zheng-Li Wang, Li Liu, Xiao-Yu Hu, Lu Guo, Qiu-Yu Li, Yao An, Ya-Jun Jiang, Shi Chen, Xue-Qiu Wang, Yu He, Lu-Quan Li

Erschienen in: BMC Pediatrics | Ausgabe 1/2019

Abstract

Background

Probiotic therapy can reduce the incidence of NEC. Therapeutic use of probiotics after NEC diagnosis reduces the severity of NEC in preterm infants or full-term infants is unclear. To evaluate the effect of probiotics on preventing the deterioration of necrotizing enterocolitis (NEC) from stage I to II/III.

Methods

A retrospective matched cohort study was performed. Included patients were ultimately divided into two groups: the probiotic treatment group (probiotics were used ≥4 days) and the no probiotic treatment group. The differences in deterioration trends between the two groups were compared. Additionally, the risk factors associated with the deterioration of NEC were further analyzed with a case-control study.

Results

A total of 231 infants met the inclusion criteria. Eighty-one pairs were matched according to similar gestational age and birth weight. Before matching, we found that the rate of deterioration of NEC from stage I to II/III in the group with probiotic treatment was similar to that in the group without probiotic treatment (23.1% [25/108] vs 26.0% [32/123], P = 0.614). After matching, the rate of deterioration of NEC between the two groups still had no significant difference (21.0% [17/81] vs 27.2% [22/81], P = 0.358). Logistic regression analysis showed that sepsis after NEC was an independent risk factor for NEC deteriorating from stage I to II/III (OR 2.378, 95% CI 1.005–5.628, P = 0.049).

Conclusion

Probiotics may not prevent the deterioration of NEC from stage I to II/III in infants, but this conclusion should be treated with caution.
Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1186/​s12887-019-1524-5) contains supplementary material, which is available to authorized users.
Zheng-Li Wang and Li Liu made equal contributions to this work.

Background

Necrotizing enterocolitis (NEC) is a serious gastrointestinal disease with a mortality rate reaching up to 20–30% [1, 2], and it has become an important cause of neonatal death. There have been no targeted treatment protocols for NEC, and we generally use symptomatic treatment. Infants with NEC commonly receive cessation of enteral nutrition, broad-spectrum antibiotics, gastrointestinal decompression and supportive treatment if necessary. Studies have suggested that prophylactic probiotic therapy can reduce the incidence of NEC in preterm infants [35], and meta-analyses have confirmed these findings [6, 7]. Studies of probiotic effects in term infants have focused on allergic diseases, immunomodulation, infectious and antibiotic-associated diarrhea, sepsis or growth [8]. Furthermore, approximately 10% of NEC cases occurred in full-term infants, but few studies have focused on this group of infants [9]. Compared with infants with stage I NEC, infants with stage II/III NEC, especially infants with stage III NEC, incur higher costs for hospitalization and care and have poorer prognoses [10]. However, until now, whether the therapeutic use of probiotics after NEC diagnosis reduces the severity of NEC in preterm infants or full-term infants is unclear. The aim of this study was to evaluate the effect of probiotic therapy on preventing the deterioration of NEC from stage I to stage II/III in infants.

Methods

Setting

The Department of Neonatology, Children’s Hospital of Chongqing Medical University, Chongqing, China, is a national clinical specialty department that currently has 300 beds and admits approximately 10,000 newborns each year.

Data collection

A retrospective cohort study was conducted. Medical records were reviewed for all infants with stage I NEC who were admitted to the Children’s Hospital of Chongqing Medical University from January 2012 to March 2016. The clinical stage of NEC was defined according to the criteria that was originally proposed by Bell et al. [11] and the modified criteria subsequently reported by Walsh and Kriegman [12]. Stage I NEC was defined according to the presence of clinical signs such as temperature instability, gastric residuals, emesis, abdominal distension, occult blood in the stool (without fissure); further confirmation came through radiographic or sonographic findings of dilated intestinal tract with slight intestinal obstruction or normal intestine. Stage II NEC was defined according to the presence of clinical signs such as gross blood in the stool (without fissure), slight metabolic acidosis along with the clinical signs of stage I NEC and having radiographic or sonographic findings of pneumatosis intestinalis or portal vein gas. The criteria of stage III NEC included nonspecific clinical features such as hypotension, bradycardia and apnea in addition to the clinical features of stage II NEC and radiographic or sonographic findings of ascites or pneumoperitoneum.
The age of NEC onset was defined as the day when one of the following signs or symptoms appeared: gastric residuals, emesis, abdominal distension, bloody stool (without fissure), diarrhea, or hypoactive bowel sounds. Patients with stage ≥II NEC at admission or with intestinal malformation (intestinal malrotation, intestinal stricture, intestinal atresia, Hirschsprung disease, anal atresia) or patients whose duration of hospitalization was ≤3 days were excluded from the study. Patients who received probiotics for ≤3 days were also excluded from further study (Fig. 1).

Probiotic and other treatments

When stage I NEC was diagnosed, all patients included in this study received similar treatment protocols including cessation of enteral nutrition, total parental nutrition support, broad-spectrum antibiotic therapy and gastrointestinal decompression. For infants whose conditions deteriorated to stage II/III NEC, intensive care, including cardiorespiratory support and blood or blood product transfusion, was also provided when necessary.
Continuous clinical evaluation for infants and abdominal X-ray, full blood test (including white blood cells, platelet counts, immature/total neutrophils, etc.), C-reactive protein and procalcitonin examination were performed. If infants’ clinical conditions improved 72 h after diagnosis of NEC Bell stage I, enteral feeding was initiated (starting with 10 ml/kg of body weight formula milk, and then adding 10–20 ml/kg of body weight per day). When the patients were permitted to be fed, the infants in the probiotic group were treated with probiotics (≥4 days, one tablet at a time, bid), and the other infants in the control group were not treated with probiotics. The probiotics used in this study were Bifidobacterium tetravaccine tablets (live) [trade name: Hangzhou Longda Xinke Biological Pharmaceutical Co., Ltd., 0.5 g/tablet] with no less than 0.5 × 106 colony-forming units (cfu) infant Bifidobacteria, Lactobacillus acidophilus and Enterococcus faecalis, 0.5 × 105 cfu Bacillus cereus. The antenatal information, basic information, complications and treatment protocols of all patients included in this study were reviewed and compared between the two groups.

Pairing method

To avoid attributing probiotics as the cause of advanced NEC stage when it may actually be attributable to gestational age and birth weight, a matched design was employed in our study. We performed 1:1 matching according to close gestational age (difference was ≤3 days) and birth weight (difference was ≤400 g). We first conducted a matched cohort study to identify whether the probiotic had an effect on the prevention of the deterioration of NEC from stage I to II/III. Then, we further explored the risk factors that might play an important role in deterioration of NEC from stage I to II/III by a case-control study. The details of the grouping are shown in Fig. 1.

Statistical analysis

All data were analyzed by using SPSS 19.0 (SPSS Inc. Chicago, IL), and continuous variables were tested for normality using the Kolmogorov-Smirnov test. Normally distributed continuous data were described as the mean ± standard deviation (M ± S.D.) and were analyzed by t test. Skewed data were described as median (interquartile range, IQR) and were analyzed by Mann-Whitney U test. Categorical data were analyzed by using the Chi-square test or Fisher exact test. These statistically significant variables were tested again by logistic regression analysis to identify the independent risk factor. Statistical significance was established if P < 0.05.

Results

Patient demographics

In the study, 472 infants with NEC were admitted to the Children’s Hospital of Chongqing Medical University. A total of 231 infants met the inclusion criteria for further study, and 241 infants were excluded due to not meeting the criteria (hospitalization less than 3 days in 29 infants, 23 infants using 1–3 days of probiotics, 15 infants with intestinal malformation, 174 infants with stage ≥II at admission, and 8 infants with incomplete information).
The baseline characteristics of the infants are shown in Table 1. The median gestational age and birth weight of the patients were 37.86 weeks and 2800 g, respectively. Moreover, 39.4%(91/231) of the patients were premature infants. All infants with NEC were fed by formula during hospitalization. Overall, 24.7% (57/231) of infants progressed to stage ≥II during hospitalization. Before matching, differences in gestational age (P = 0.025), birth weight (P = 0.015), premature birth (P = 0.044), cortical steroid use in pregnancy (P = 0.047), anemia (P = 0.003) and gastrointestinal decompression (P = 0.048) were found between the probiotics group (n = 108) and the nonprobiotics group (n = 123). After matching, there were 81 pairs of infants who met the matching requirements, and no significant differences in these variables were found between the matched groups (P > 0.05).
Table 1
The baseline information of NEC infants treated (with/without) probiotics in this study
Variables
Total (n = 231)
Before matching
After matchinga
With (n = 108)
Without (n = 123)
P
With (n = 81)
Without (n = 81)
P
Gestational age, IQR, wks
37.86 (34.57–39.71)
37.07 (34.04–39.25)
38.43 (35.14–39.86)
0.025
37.29 (34.71–38.86)
38.14 (34.86–39.50)
0.128
Premature, %(n)
39.4 (91)
46.3 (50)
33.3 (41)
0.044
42.0 (34)
35.8 (29)
0.420
Birth weight, (±SD), g
2800 (2000–3305)
2620 (1927.5–3180)
3000 (2100–3400)
0.015
2591.81 ± 718.45
2705.19 ± 713.69
0.315
Male, %(n)
40.7 (94)
48.9 (46)
51.1 (48)
0.582
47.1 (32)
52.9 (36)
0.524
Vaginal delivery, %(n)
42.0 (97)
38.0 (41)
45.5 (56)
0.245
39.5 (32)
46.9 (38)
0.341
The age of onset, IQR, d
3.44 (1.1–11.1)
5.49 (1.33–11)
3.14 (1–13)
0.355
5.57 (1.1–10.1)
3.4 (1–13.5)
0.988
PROM> 18 h, %(n)
5.2 (12)
2.8 (3)
7.3 (9)
0.121
2.5 (2)
6.2 (5)
0.440
Amniotic fluid contamination, %(n)
13.4 (31)
13.9 (15)
13.0 (16)
0.845
16.0 (13)
12.3 (10)
0.499
Asphyxia, %(n)
10.8 (25)
9.3 (10)
12.2 (15)
0.474
11.1 (9)
13.6 (11)
0.633
Infants of diabetic mothers, %(n)
2.6 (6)
3.7 (4)
1.6 (2)
0.565
3.7 (3)
2.5 (2)
1.000
PIH, %(n)
5.6 (13)
8.3 (9)
3.3 (4)
0.095
8.6 (7)
4.9 (4)
0.349
ICP, %(n)
2.2 (5)
2.8 (3)
1.6 (2)
0.883
2.5 (2)
1.2 (1)
1.000
Antenatal corticosteroids, %(n)
3.5 (8)
6.5 (7)
0.8 (1)
0.047
6.2 (5)
1.2 (1)
0.212
IQR interquartile range, PROM prolonged rupture of membranes, PIH pregnancy-induced hypertension, ICP intrahepatic cholestasis of pregnancy
aWe performed 1:1 matching according to close gestational age (difference was ≤3 days) and birth weight (difference was ≤400 g)
The complications are shown in Table 2 and Additional file 1: Table S1. Several complications such as anemia (68.8%), coagulation disorder (59.3%), hypoproteinemia (51.9%), sepsis (31.2%), hypokalemia (32.5%), thrombocytopenia (21.2%) and respiratory failure (16%) were found in NEC infants. With the exception of anemia, the main complications had no significant difference between the two groups before or after matching (P>0.05).
Table 2
The complications or comorbidities of NEC infants treated (with/without) probiotics in this study
Variables
Total (n = 231)
Before matching
After matchinga
With (n = 108)
Without (n = 123)
P
With (n = 81)
Without (n = 81)
P
NRDS, %(n)
7.4 (17)
8.3 (9)
6.5 (8)
0.595
7.4 (6)
6.2 (5)
0.755
Apnea, %(n)
6.1 (14)
8.3 (9)
4.1 (5)
0.175
6.2 (5)
3.7 (3)
0.717
Respiratory failure, %(n)
16.0 (37)
14.8 (16)
17.1 (21)
0.641
13.6 (11)
16.0 (13)
0.658
Pulmonary hemorrhage, %(n)
5.2 (12)
4.6 (5)
5.7 (7)
0.717
4.9 (4)
7.4 (6)
0.514
Sepsis, %(n)
31.2 (72)
37.0 (40)
26.0 (32)
0.071
39.5 (32)
32.1 (26)
0.325
Septic shock, %(n)
2.6 (6)
1.9 (2)
3.3 (4)
0.552
2.5 (2)
4.9 (4)
0.677
Bacterial meningitis, %(n)
4.3 (10)
3.7 (4)
4.9 (6)
0.910
3.7 (3)
7.4 (6)
0.493
Congenital heart diseaseb, %(n)
44.2 (102)
45.4 (49)
43.1 (53)
0.728
46.9 (38)
46.9 (38)
1.000
Cardiac insufficiency, %(n)
1.3 (3)
1.9 (2)
0.8 (1)
0.910
1.2 (1)
1.2 (1)
1.000
MODS,%(n)
0.4 (1)
0 (0)
0.8 (1)
1.000a
0 (0)
1.2 (1)
1.000a
Anemia, %(n)
68.8 (159)
79.6 (86)
59.3 (73)
0.001
76.5 (62)
60.5 (49)
0.028
Coagulation disorder, %(n)
59.3 (137)
63.9 (69)
55.3 (68)
0.184
61.7 (50)
55.6 (45)
0.425
Thrombocytopenia, %(n)
21.2 (49)
22.2 (24)
20.3 (25)
0.725
23.5 (19)
23.5 (19)
1.000
NRDS neonatal respiratory distress syndrome, MODS multiple organ dysfunction syndrome
aWe performed 1:1 matching according to close gestational age (difference was ≤3 days) and birth weight (difference was ≤400 g)
bThe congenital cardiac lesion: patent ductus arteriosus, ventricular septal defect or atrial septal defect. No special intervention was required in all cases after consultation with cardiologists and cardiac surgeons
The treatment protocols for NEC are shown in Table 3. Gastrointestinal decompression (64.1%), blood transfusion (23.4%), and dopamine support (25.5%) were also used for these NEC infants. Before matching, most treatment protocols had no significant difference between the two groups, with the exception of gastrointestinal decompression (P = 0.048). After matching, no difference in therapy was found between the two groups.
Table 3
The treatment protocols of NEC infants treated (with/without) probiotics in this study
Variables
Total (n = 231)
Before matching
After matchinga
With (n = 108)
Without (n = 123)
P
With (n = 81)
Without (n = 81)
P
Gastrointestinal decompression, %(n)
64.1 (148)
57.4 (62)
69.9 (86)
0.048
58.0 (47)
67.9 (55)
0.193
Duration of gastrointestinal decompression, IQR, d
4 (2–6)
3 (2–6)
4 (2–6)
0.319
3 (2–6)
6 (2–6)
0.643
Red blood cell transfusion, %(n)
23.4 (54)
26.9 (29)
20.3 (25)
0.242
22.2 (18)
23.5 (19)
0.852
Platelet support, %(n)
6.5 (15)
7.4 (8)
5.7 (7)
0.597
8.6 (7)
7.4 (6)
0.772
Plasma support, %(n)
13.0 (30)
12.0 (13)
13.8 (17)
0.687
12.3 (10)
13.6 (11)
0.815
Intravenous immunoglobulin, %(n)
13.4 (31)
16.7 (18)
10.6 (13)
0.175
14.8 (12)
12.3 (10)
0.646
Albumin support, %(n)
43.7 (101)
41.7 (45)
45.5 (56)
0.555
38.3 (31)
44.4 (36)
0.425
Dopamine support, %(n)
25.5 (59)
25.0 (27)
26.0 (32)
0.860
23.5 (19)
24.7 (20)
0.854
Caffeine support, %(n)
9.1 (21)
9.3 (10)
8.9 (11)
0.934
8.6 (7)
7.4 (6)
0.772
aWe performed 1:1 matching according to close gestational age (difference was ≤3 days) and birth weight (difference was ≤400 g)

The effect of probiotics on the deterioration of NEC between the two groups

Before matching, we found that the rate of deterioration of NEC from stage I to II/III in the probiotic treatment group was similar to that in the group without probiotic treatment (23.1% [25/108] vs 26.0% [32/123], P = 0.614). After matching, the rate of deterioration of NEC between the group with probiotic treatment and the group without probiotic treatment still had no significant difference (21.0% [17/81] vs 27.2% [22/81], P = 0.358). For those infants who received probiotic treatment, no significant difference in the administration time of probiotics was found between the stage I group (n = 64) and the stage ≥II group (n = 17) (9[7–14.75] vs 12[6.5–23], P = 0.362).
On the basis of the above findings, an interesting question was put forth regarding which factors may have contributed to the deterioration from stage I to II/III. We used the matched cases to design a case-control study to find those risk factors. Perinatal factors, complications and treatment therapy were compared between the stage I group (n = 123) and the stage ≥II group (n = 39), and none of the perinatal factors and baseline characteristics were significantly associated with NEC progression (Table 4 and Additional file 1: Table S2). However, sepsis (P = 0.021) after NEC was significantly related to the deterioration of NEC (Table 5). These statistically significant variables were tested again by logistic regression analysis, and sepsis (OR: 2.378, 95% CI: 1.005–5.628, P = 0.049) after NEC was identified as the independent risk factor for stage I NEC deteriorating to stage II/III NEC.
Table 4
The treatment protocols between stage I and ≥ II NEC infants after matching
Variables
Stage I (n = 123)
≥ Stage II (n = 39)
P
Gastrointestinal decompression, %(n)
57.7 (71)
79.5 (31)
0.014
Duration of gastrointestinal decompression, d
4 (2–6)
3 (2–6)
0.817
Blood exchange transfusion, %(n)
0.8 (1)
0 (0)
1.000
Red blood cell support, %(n)
23.6 (29)
20.5 (8)
0.691
Platelet support, %(n)
13.8 (17)
10.3 (4)
0.564
Plasma or cryoprecipitate support, %(n)
13.8 (17)
12.8 (5)
0.874
Intravenous immunoglobulin, %(n)
42.3 (52)
38.5 (15)
0.673
Albumin support, %(n)
24.4 (30)
23.1 (9)
0.867
Dopamine support, %(n)
7.3 (9)
10.3 (4)
0.802
We performed 1:1 matching according to close gestation age (difference was ≤3 days) and birth weight (difference was ≤400 g)
Table 5
Comparison of complications between infants with NEC stage I and those with ≥II after matching
Variables
Stage I (n = 123)
≥ Stage II (n = 39)
P
Neonatal respiratory syndrome, %(n)
8.1 (10)
2.6 (1)
0.402
Apnea, %(n)
4.1 (5)
7.7 (3)
0.626
Respiratory failure, %(n)
15.4 (19)
12.8 (5)
0.687
Pulmonary hemorrhage, %(n)
7.3 (9)
2.6 (1)
0.488
Sepsis, %(n)
30.9 (38)
51.3 (20)
0.021
Septic shock, %(n)
4.1 (5)
2.6 (1)
1.000
Bacterial meningitis, %(n)
5.7 (7)
5.1 (2)
1.000
Congenital heart disease, %(n)
46.3 (57)
48.7 (19)
0.796
Anemia, %(n)
69.9 (86)
64.1 (25)
0.496
Coagulation disorder, %(n)
59.3 (73)
56.4 (22)
0.745
Thrombocytopenia, %(n)
25.2 (31)
17.9 (7)
0.352
Cold injury syndrome, %(n)
3.3 (4)
5.1 (2)
0.957
Hypoproteinemia, %(n)
52.0 (64)
46.2 (18)
0.522
We performed 1:1 matching according to close gestational age (difference was ≤3 days) and birth weight (difference was ≤400 g)

Discussion

There have been many reports that have evaluated probiotic administration for the prevention of NEC. Many previous reports of probiotics found that the use of probiotics was beneficial for the prevention of severe NEC. To our knowledge, data have rarely been specifically focused on whether probiotics prevent the deterioration of NEC from stage I to II/III in infants. In the present study, we found that probiotics could not prevent the deterioration of NEC from stage I to II/III in infants.
Breastfeeding has a protective effect against NEC [13]. Studies have found that human milk is not sterile, and up to 200 different bacterial species have been found in human milk [14]. One study involving the microbial detection of milk samples from healthy women collected at three different time points showed nine bacterial genera were present in all samples but in different concentrations among the subjects [14]. This finding suggests that milk microbes from each mother are optimized for the health of her own infant, and breast milk of healthy women is a source of commensal bacteria in the infant gut [15]. Therefore, the administration of large-scale industrially produced probiotics regardless of the NEC infants’ individual characteristics of intestinal microbes may not reduce the deterioration of NEC.
There are currently no unified standards for access schemes detailing routine use in the prevention of NEC. Probiotic type, dosage and administration timing may affect the influence of probiotics on the incidence of NEC, and controversial findings of the influence of probiotics on the incidence of NEC have been published [1618]. One guideline suggested that a daily dose of 3 × 109 cfu/day may be appropriate for neonates of less than 32 weeks gestation [16]. Evidence indicates that to be functional, probiotics have to be viable and at sufficient dosage levels, typically 106 to 107 cfu/g of product, and many probiotic products have the same dose of bacteria [16]. It is not clear whether 106 to 107 (cfu)/g of product is effective in preventing the deterioration of NEC from stage I to II/III. Furthermore, given that the dose of 106 cfu used in the present study was much lower than other studies (107~1010 cfu) [17, 18], the conclusion should be treated with caution.
Early initiation of enteral feeding after NEC may have a beneficial effect on the recovery of the intestinal mucosa [19]. In contrast, late initiation of enteral feeding may lead to mucosal villous atrophy [19, 20]. There is a lack of consensus among surgeons and neonatologists regarding the optimal feeding strategy after an NEC diagnosis to prevent its recurrence. Most textbooks suggest bowel rest for 7 to 10 days, but there is a lack of clinical evidence to support this recommendation [21]. Initiating early enteral feeding within 5 days of NEC diagnosis (Bell stage II or above) is not associated with adverse outcomes, including NEC recurrence [22]. There was also no guideline regarding the initiation of feeding for infants with NEC Bell stage I.
There are some limitations in this study, including the errors and biases inherent to the nature of a retrospective study. In the present study, we performed 1:1 matching by using similar gestational age and birth weight, and it led to a loss of approximately 30% of sample capacity. Therefore, the overall sample capacity of the study was relatively small.

Conclusions

In summary, we found that probiotics might not prevent the deterioration of NEC, but this conclusion should be treated with caution.

Acknowledgements

We thank Dr. Jialin Yu for great help to analyze the data.

Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 81601323), the Scientific Research Foundation of The science and Technology Commission of Chongqing (Grant No.cstc2015jcyjA10089, cstc2018jscx-msybx0027) and Chongqing Municipal Administration of Human Resources and Social Security (Grant No.Cx2017107).

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
This study was carried out in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of the Children’s Hospital of Chongqing Medical University. The study was a retrospective matched cohort study. Considering the anonymized nature of the data and scientific purpose of this study, the requirements for informed consent were waived by the Ethics Committee of Children’s Hospital of Chongqing Medical University.
Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Metadaten
Titel
Probiotics may not prevent the deterioration of necrotizing enterocolitis from stage I to II/III
verfasst von
Zheng-Li Wang
Li Liu
Xiao-Yu Hu
Lu Guo
Qiu-Yu Li
Yao An
Ya-Jun Jiang
Shi Chen
Xue-Qiu Wang
Yu He
Lu-Quan Li
Publikationsdatum
01.12.2019
Verlag
BioMed Central
Erschienen in
BMC Pediatrics / Ausgabe 1/2019
Elektronische ISSN: 1471-2431
DOI
https://doi.org/10.1186/s12887-019-1524-5

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