Reducing the Risk of Birth Defects Associated with Maternal Influenza: Insights from a Hungarian Case-Control Study

Influenza viruses can cause several complications during pregnancy. Therefore, we aimed to investigate the effects of influenza on the development of congenital abnormalities (CAs) by analyzing the database of the Hungarian Case-Control Surveillance of Congenital Abnormalities (HCCSCA). In our multicenter, case-control, population-based study, we processed clinician-reported outcomes and diagnoses collected in the HCCSCA. The case group included newborns with different non-chromosomal birth defects, while the controls were newborns without CAs. Maternal influenza, as a risk factor for CAs, was analyzed by using a logistic regression model and odds ratios with 95% confidence intervals (CIs). Our results showed that maternal influenza in the first trimester was associated with increased odds of developing non-chromosomal CAs (OR: 1.41, CI: 1.28-1.55). There were increased odds of neural tube defects (OR: 2.22, CI: 1.78-2.76), orofacial clefts (OR: 2.28, CI: 1.87-2.78), and congenital heart defects (OR: 1.28, CI: 1.10-1.49) after influenza infection. In all cases, we found a protective effect of folic acid supplementation in the first trimester. In summary, the odds of non-chromosomal birth defects are higher after maternal influenza in the first trimester, and folic acid or pregnancy vitamin supplementation and antipyretic therapy may reduce the effect of maternal influenza during the first trimester.

Maternal age is highly associated with non-chromosomal congenital anomalies: Analysis of a population-based case-control database

OBJECTIVE

The role of maternal age in the development of non-chromosomal congenital anomalies (NCAs) is under debate. Therefore, the primary aim of this study was to identify the age groups at risk for NCAs. The secondary aim was to perform a detailed analysis of the relative frequency of various anomalies.

DESIGN

National population-based study.

SETTING

The Hungarian Case-Control Surveillance of Congenital Anomalies (CAs) between 1980 and 2009.

POPULATION OR SAMPLE

A cohort of 31 128 cases with confirmed NCAs was compared with Hungary's total of 2 808 345 live births.

METHODS

Clinicians prospectively reported cases after delivery. Data were analysed by non-linear logistic regression. Risk-increasing effect of young and advanced maternal age was determined by each NCA group.

MAIN OUTCOME MEASURES

These were the total number of NCAs: cleft lip and palate, circulatory, genital, musculoskeletal, digestive, urinary, eye, ear, face, and neck, nervous system, and respiratory system anomalies.

RESULTS

The occurrence of NCAs in our database was lowest between 23 and 32 years of maternal age at childbirth. The relative risk (RR) of any NCA was 1.2 (95% CI 1.17-1.23) and 1.15 (95% CI 1.11-1.19) in the very young and advanced age groups, respectively. The respective results for the circulatory system were RR = 1.07 (95% CI 1.01-1.13) and RR = 1.33 (95% CI 1.24-1.42); for cleft lip and palate RR = 1.09 (95% CI 1.01-1.19) and RR = 1.45 (95% CI 1.26-1.67); for genital organs RR = 1.15 (95% CI 1.08-1.22) and RR = 1.16 (95% CI 1.04-1.29); for the musculoskeletal system RR = 1.17 (95% CI 1.12-1.23) and RR = 1.29 (95% CI 1.14-1.44); and for the digestive system RR = 1.23 (95% CI 1.14-1.31) and RR = 1.16 (95% CI 1.04-1.29).

CONCLUSION

Very young and advanced maternal ages are associated with different types of NCAs. Therefore, screening protocols should be adjusted for these risk groups.

A méhüreg anatómiai rendellenességei habituális vetélőkben

Introduction: One percent of couples trying to have children are affected by recurrent miscarriage. These pregnancy losses have different pathogenetic (genetic, endocrine, anatomic, immunologic, microbiologic, haematologic and andrologic) backgrounds, but recurrent miscarriage remains unexplained in more than half of the affected couples. Aim: To explore risk factors for recurrent pregnancy loss the authors studied the incidence of anatomic disorders of the uterine cavity occur in Hungarian women with recurrent miscarriage. Method: Medical records of 152 patients with recurrent miscarriage were analyzed retrospectively. In order to explore disorders of the uterine cavity hysteroscopy or 3-dimensional sonography in 132 women, hysterosalpingography in 16 and hysterosalpingo-sonography in 4 patients were used. Results: Incidence of anomalies in the uterine cavity was found in women with recurrent miscarriage to be 15.8%. A variety of the uterine anomalies was found including uterine septum in 6.5%, endometrial polyp in 2.6%, arcuate and bicornuate uteri both in 2% and 2%, submucosal myoma in 1.3 %, and intrauterine synechiae in 1.3%. Conclusions: These findings suggest that morphologic disorder of the uterine cavity is frequent in Hungarian women with recurrent miscarriage. Therefore, assessment of the uterine anatomy is recommended in such patients. Orv. Hetil., 2015, 156(27), 1081–1084.