Abstract: FR-PO1016
The Speed-Physiology Paradox: Nocturnal Salvage of Short Daily Home Hemodialysis via Decoupled Fluid Kinetics
Session Information
- Hemodialysis: Clinical Challenges, Patient-Centered Outcomes, and Quality of Life
October 23, 2026 | Location: Exhibit Hall A, Convention Center
Abstract Time: 10:00 AM - 12:00 PM
Category: Dialysis
- 801 Dialysis: Hemodialysis and Frequent Dialysis
Author
- Bermudez, Maria Camila, Geisinger Health, Danville, Pennsylvania, United States
Group or Team Name
- Selinsgrove At Home, DaVita Kidney Care
Introduction
The success of short daily home hemodialysis (SDHHD) is predicated on cardiovascular tolerance. For patients with right-sided heart failure and pulmonary hypertension, the abbreviated SDHHD window often fails to accommodate their unique physiology. When fluid removal is compressed, the ultrafiltration rate (UFR) exceeds the compensatory capacity of a compromised right ventricle, triggering hemodynamic instability and "thirst loops." In these cases, "modality failure" reflects a failure to match therapy speed with cardiovascular limits rather than a failure of the home environment. We report a case where Nocturnal Home Hemodialysis (NHHD) served as a physiological salvage strategy by decoupling fluid kinetics from time constraints.
Case Description
A 62-year-old male with ESRD, morbid obesity, and pulmonary hypertension performed SDHHD five days per week. Right-sided heart failure severely restricted his fluid tolerance. Despite a UFR below 10 mL/kg/hr, he suffered severe symptomatic IDH and could not reach dry weight. Rapid plasma volume contraction triggered a thirst-ultrafiltration feedback loop, leading to an IDWG of 2–3 L and a 5-hour post-dialysis "washout." Transitioning to NHHD (8-hour sessions, 4 nights/week) with slower UFRs of 0.3 L/h eliminated the IDH (nadir SBPs >110 mmHg). Thirst decreased, dropping IDWG to 0.8-1 L. Recovery time fell to <2 hours, restoring autonomy and ensuring therapy retention
Discussion
This case illustrates that home dialysis success may depend on synchronizing UFR with the patient’s hemodynamic threshold. In patients with precarious cardiovascular reserve, the "SDHHD Paradox" emerges: frequent clearance benefits are negated by the aggressive fluid kinetics required within short windows. When UF speed outpaces the plasma refill rate, it triggers a compensatory RAAS response. The resulting spike in Angiotensin II drives the very IDWG that necessitates high UFRs, trapping the patient in a refractory thirst loop. Transitioning to NHHD applies a "decoupling theory" to fluid management. By extending duration, we reduce UFR to levels that respect unique physiology, preventing the acute volume contraction that stimulates thirst. Matching therapy speed to cardiovascular limits transforms a failing trajectory into a sustainable modality.