KCNQ1 and hydrops fetalis: The mRNA expression levels of Kv4.3α, KvLQT1 and L-Caα1c were significantly reduced in patients with HF (P<0.01) in comparison with those detected in normal individuals (0.83±0.07 versus 0.45±0.09, 0.56±0.04 versus 0.36±0.06, 0.42±0.09 versus 0.25±0.06, respectively).