MO657: Low Incidence of Intradialytic Hypotension During Online Post-Dilution High-Volume Haemodiafiltration: A Randomized Cross-Over Trial between Four Intermittent Dialysis Modalities

Abstract

Abstract BACKGROUND AND AIMS Compared with standard haemodialysis (S-HD), online post-dilution haemodiafiltration (HDF) is associated with improved survival, especially when high convection volumes [high-volume (HV)-HDF] are achieved [1]. A superior intradialytic haemodynamic stability may play an important role in this respect. Therefore, we assessed whether the intradialytic haemodynamic profile differs between four dialysis modalities, including S-HD and HV-HDF. METHOD In the current randomized cross-over trial (NCT03249532, ClinicalTrials.gov), 40 prevalent dialysis patients were subjected to S-HD [dialysate temperature (Td) 36.5°C], HD with cool dialysate (C-HD; Td 35.5°C), low-volume (LV)-HDF [convection volume (CV) 15 L/1.73 m2/session) and HV-HDF (CV ≥23 L/1.73 m2/session) (both Td 36.5°C). Blood pressure (BP) was measured 4x/hour. The primary endpoint was the total number of intradialytic hypotensive (IDH) episodes. IDH was defined as a nadir in systolic BP (SBP) <90 mmHg for a pre-dialysis SBP <160 mmHg and <100 mmHg for a pre-dialysis SBP ≥160 mmHg, independent of symptoms and interventions. In addition, an explorative analysis was performed on the incidence of early-onset IDH, which has recently been related to mortality [2]. Secondary endpoints included the intradialytic courses of SBP, diastolic BP (DBP) and mean arterial pressure (MAP). RESULTS IDH occurred significantly less frequent during C-HD (0.21 episodes/session) and HV-HDF (0.27/session) compared with S-HD (0.68/session, both P < .0005) (Figure 1). Furthermore, early-onset of IDH was also observed more frequently during S-HD (0.32/session) than during C-HD (0.07/session, P<.0005) or HV-HDF (0.10/session, P = .001) (Figure 1). After correction for multiple testing, the intradialytic courses of SBP, DBP and MAP declined only significantly during S-HD (−6.8, −5.2, −5.2 mmHg/session; P = .004, <.0005, .002 resp.) whereas these remained stable in the other modalities (Table 1). CONCLUSION In conclusion, during both C-HD and HV-HDF, IDH occurred least frequent and the intradialytic haemodynamic stability was best preserved. In contrast, intradialytic haemodynamic stability is most dysregulated during S-HD. Therefore, it is conceivable that the survival benefit of HV-HDF over S-HD is (at least partly) due to a more stable intradialytic haemodynamic profile and consequently less repetitive tissue injury.