Table 2.

Summary table of 6 articles, either Literature Reviews or Systematic Literature reviews: Decline of RRF and urine output volume during the first year of HD.

	Author (year), Title	Study design	Sample size and sites	comments/key findings
1	Huang, S. et al. (31) “Euvolemia in haemodialysis patients: A potentially dangerous goal?”	Literature review	12 articles (1999 to 2016) (United Kingdom)	Patient characteristics such as RRF, adequate volume control, lack of significant anaemia/electrolyte imbalance, satisfactory health related quality of life, low comorbid disease burden, and good nutritional status. Regular RRF measurements is essential, because HD frequency needs to be adjusted depending on the patient’s RRF status.
2	Kong, Davies, & Mount (24) “The importance of residual kidney function in dialysis patients.”	Systematic literature review	Articles from 2017 to 2018 (Victoria, Australia)	Over 80% of patients have some levels of residual renal function present at the start of dialysis treatments. There is a decline over the years, however, up to 30% of patients after 5 years of HD still have a measurable level of RRF. In HD patients, RRF is usually disregarded. To maintain and maximize RRF in HD patients, further research is needed.
3	Mathew, A.T. (17) “Incremental dialysis for preserving residual kidney function: Does one size fit all when initiating dialysis?”	Literature review	12 observational cohort studies (California, United States)	Haemodialysis is usually initiated on 3 times per week, regardless of residual kidney function. As RKF is associated with numerous benefits for the patients, it is essential for HD treatments to be personalized, taking into account the individual RKF. Incremental HD prescriptions are recommended in this case, as HD initiation is less frequent and allows for regular measurement of RKF.
4	OK et al. (32) “Interplay of volume, blood pressure, organ ischemia, residual renal function, and diet: Certainties and uncertainties with dialytic management.”	Literature review	(Turkey)	Both blood pressure and volume control are managed poorly in HD patients which causes the increased morbidity and mortality. Restriction of dietary salt intake, increased frequency, and/or duration of haemodialysis sessions or addition of temporary extra sessions during the process of gradually reducing post- dialysis body weight in conventional HD and discontinuation of antihypertensive medications could prevent these complications.
5	Mitema & Jaar (33) “How can we improve the quality of life of dialysis patients.”	Literature review: review of various Health-Related Quality of Life (HRQOL) tools	(United States)	There are multiple validated tools which can be used to improve HRQOL in ESRD patients. Each tool should be used in an individualized manner to address specific dialysis patient needs such as anaemia, depression sexual dysfunction, sleep related disorders and the preservation of residual kidney function.
6	Fang et al. (34) “Residual renal function among patients on haemodialysis and implications for clinical practice.”	Systematic Literature review	4 databases searched for relevant information between 200 and 2018 (Medline, CINAHL Plus, Embase and Pubmed)	Nephrology nurses can improve clinical practice to assist preserving RKF in HD patients through preventing intradialytic hypotension, improving dry weight assessment and volume control, advocating for incremental HD, promoting haemodiafiltration and other measures