Percentage of patients on hemodialysis with hospitalized mesenteric ischemia (cases) and without hospitalized mesenteric ischemia (controls) with intradialytic hypotension, defined in six ways. The proportion of patients with intradialytic hypotension differed widely, depending on the definition used. Fall20, (predialysis SBP – nadir intradialytic SBP) ≥20 mm Hg; Fall30, (predialysis SBP – nadir intradialytic SBP) ≥30 mm Hg; Nadir90, nadir intradialytic SBP <90 mm Hg; Nadir100, nadir intradialytic SBP <100 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.