Table 1.

Six definitions of intradialytic hypotension (IDH) (15)

VariableDefinition
Nadir90Nadir intradialytic SBP <90 mm Hg
Nadir100Nadir intradialytic SBP <100 mm Hg
Fall20(Predialysis SBP – nadir intradialytic SBP) ≥20 mm Hg
Fall30(Predialysis SBP – nadir intradialytic SBP) ≥30 mm Hg
Nadir90Fall20Nadir intradialytic SBP <90 mm Hg and (predialysis SBP – nadir intradialytic SBP)
≥20 mm Hg
Nadir90Fall30Nadir intradialytic SBP <90 mm Hg and (predialysis SBP – nadir intradialytic SBP)
≥30 mm Hg
  • IDH, intradialytic hypotension; Nadir90, nadir intradialytic SBP <90 mm Hg; SBP, systolic BP; Nadir100, nadir intradialytic SBP <100 mm Hg; Fall20, (predialysis SBP – nadir intradialytic SBP) ≥20 mm Hg; Fall30, (predialysis SBP – nadir intradialytic SBP) ≥30 mm Hg; Nadir90Fall20, nadir intradialytic SBP <90 mm Hg and (predialysis SBP – nadir intradialytic SBP) ≥20 mm Hg; Nadir90Fall30, nadir intradialytic SBP <90 mm Hg and (predialysis SBP – nadir intradialytic SBP) ≥30 mm Hg.