Dialysis Recovery Time: Associated Factors and Its Relation to Quality of Life in Hemodialysis Patients.

Dialysis is defined as the diffusion of molecules in solution across a semipermeable membrane along an electrochemical concentration gradient. The primary goal of hemodialysis (HD) is to restore the intracellular and extracellular fluid environment that is characteristic of normal kidney function. In addition to diffusion, solutes may pass through pores in the membrane by means of a convective process driven by hydrostatic or osmotic pressure gradients a process called ultrafiltration. During ultrafiltration, there is no change in solute concentrations; its primary purpose is the removal of excess total body water.

Fatigue is a well-known and frequent symptom in HD patients with a reported association with the decrease in health-related quality of life commonly found in this population. The prevalence of fatigue ranges from 60% to as high as 97% in patients on long-term renal replacement therapy. Despite this fact, health care providers are still unaware of both its presence and severity.

The clinical assessment of fatigue in dialysis patient can be somehow difficult for the treating physicians. Patients usually show diversity in their recovery from fatigue. However, early recognition is essential because a number of treatable causes can be easily identified.

Post-HD fatigue is a common incapacitating symptom affecting renal population. It is defined as a feeling of exhaustion that regularly follows each dialysis procedure. Uremia-related factors such as anemia, nutritional deficiency and enhanced inflammatory state could possibly lead to post-HD fatigue. In addition, the HD procedure itself including the efficiency of HD session, type of dialyzer and ultrafiltration rate are potential exacerbating factors for post-HD fatigue.

Several methods have been proposed as a way to assess post-HD fatigue with the "time to recover (minutes) from HD" being one of them. Lindsay et al. assisted patients' responses to the single open-ended question, "How long does it take you to recover from a dialysis session?".Lindsay et al. found that post hemodialysis recovery time is an important indicator for patients' quality of life.