KLF2 and hydrops fetalis: The main findings of the present study are: i) low output HF rats show a trend to display reduced KLF2 expression levels in the CB and an enhanced CB chemoreflex drive, ii) high output HF rats have normal KLF2 expression in the CB and reduced CB chemoreflex function, and iii) autonomic imbalance and breathing disturbances in high output HF are not related to CB chemoreceptor potentiation.