High volume on line hemodiafiltration in dialysis pregnant patients: predilutional or postdilutional?

Although the frequency of pregnancy in women on chronic dialysis is extremely low, it is associated with severe maternal and perinatal morbidity and mortality. This situation represents a challenge for the therapeutic team, which requires multidisciplinary management, as well as measures to adequate dialysis treatment. Such efforts include increasing the time and frequency of dialysis session, maintaining low uremia levels and ensuring hemodynamic stability by avoiding intra-treatment arterial hypotension and hydro electrolytic fluctuations. Regarding the dialysis modality, literature makes references to hemodialysis or peritoneal dialysis in pregnancy women, but little is known about the of high volume online hemodiafiltration (HVHDF) as well as the appropriate type of replacement fluid (pre-dilution or post-dilution). We present two cases of patients who were pregnant while being treated with HVHDF modality and had a favorable evolution, where the decision to continue with this dialysis modality was motivated by a best hemodynamic stability and the highest clearance of all types of uremic toxins offered by HVHDF.