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Severe neurological problems and other special manifestations such as high prevalence of structural cardiac changes has been described in infants vertically exposed to the Zika virus (ZIKV) and has been called congenital Zika virus syndrome (CZS). Previous studies have shown that the 24-hour Holter heart rate variability (HRV) analysis allows the prediction of worse outcomes in infants with neurological impairment and higher risk of sudden infant death syndrome (SIDS), hypertension, diabetes mellitus and other cardiovascular diseases. This study describes the 24-hour Holter findings of infants with confirmed vertical exposure to the ZIKV by positive polymerase chain reaction (PCR) assays in the mother's blood during pregnancy and/or in the urine or cerebrospinal fluid of the newborn. Data analysis was descriptive and included two subgroups according to the presence of fetal distress, positive PCR to ZIKV in the newborn, CZS and severe microcephaly. Heart rate, pauses, arrhythmias, ST segment and QT interval analyses and HRV evaluation through R-R, SDNN, pNN50 and rMMSD were described. The Mann-Whitney test was performed to assess differences between the two subgroups. The sample consisted of 15 infants with a mean age of 16 months, nine of whom were male. No arrhythmias or QT interval changes were observed. The comparison of HRV through the Mann-Whitney test showed a significant difference between patients with and without CZS, with and without severe microcephaly, with lower HRV in the groups with severe microcephaly and CZS. The study suggests that there is an increased risk of SIDS and cardiovascular diseases in this group of patients.

Background: Antenatal exposure to Zika virus (ZIKV) is related to severe neurological manifestations. A previous study in Brazil reported an increased incidence of non-severe congenital heart defects in infants with diagnosis of congenital Zika syndrome but without laboratory confirmation of ZIKV infection in the mother or infant. The objective of this study is to report echocardiographic (ECHO) findings in infants with laboratory confirmed antenatal exposure to ZIKV., Methodology: Cross sectional study of cardiologic assessments of infants born between November 2015 and January 2017 with confirmed vertical exposure to ZIKV in Rio de Janeiro, Brazil., Results: The study enrolled 120 children with a median age of 97 days (1 to 376 days). In utero exposure to ZIKV was confirmed in 97 children (80,8%) through positive maternal polymerase chain reaction (PCR) results during pregnancy or a positive PCR result at birth; 23 additional children (19.2%) had maternal positive PCR results during pregnancy and postnatally. Forty- eight infants (40%) had cardiac defects noted on ECHO. Thirteen infants (10.8%) had major cardiac defects (atrial septal defect, ventricular septal defect, patent ductus arteriosus). None of the defects were severe. The frequency of major defects was higher in infants whose mothers had a rash in the 2nd trimester of pregnancy, or who had altered Central Nervous System (CNS) imaging postnatally or were preterm., Conclusions: Infants with in utero ZIKV exposure have a higher prevalence of major cardiac defects, however none were severe enough to require immediate intervention. For this reason, guidelines for performance of postnatal ECHO in this population should follow general newborn screening guidelines, which significantly reduces the burden of performing emergent fetal or neonatal ECHOs in a setting where resources are not available, such as most Brazilian municipalities.