Results
We included a total of 40 cases with prenatally detected fetal cardiac rhythm disturbances. Bradyarrhythmia accounted for the majority at 57.5% (n=23/40) among all types of fetal arrhythmias, followed by irregular rhythm at 22.5% (n=9/40) and tachyarrhythmia at 20% (n=8/40). Complete heart blocks (CHB) emerged as the primary cause of fetal bradyarrhythmia. At the time of diagnosis, hydrops was observed in 20% of all fetal arrhythmia cases (n=8/40). Structural anomalies were present in 30% of cases (n=12/40) of which 27.5% (n=11/40) were cardiac anomalies and in 2.5% (n=1/40) was lymphatic anomaly. Maternal antibody positivity for anti-Ro, anti-La was noted in 22.5% (n= 9/40); anti-Ro positive in 8 cases and both positive in one case. The clinical characteristics and outcomes are summarized in Table 2 and 3 .