“…While many were critical of the terminology 'square meter hour hypothesis' because it failed to encompass important variables such as dialyzer efficiency, membrane permeability and variation in the generation rales for toxic solutes, the importance of the alterations in dialysis prescription as an in vestigative tool was quickly appreciated and exploited by numerous investigators. Cited by way of example is the work of Ginn et al [14], Ratazzi et al [28], Rosenzwelg et al [29], and Teehan et al [35]. Identification of the impor tance of these treatment variables plus the overriding importance of residual renal func tion in weekly clearance figures for middle molecules [2] has helped explain the reports of neuropathy occurring after initiating main tenance dialysis [1,4,21].…”