7. A priori definitions of intradialytic hypotension in the literature.

Source	Definition
Nadir90	Minimum intradialytic SBP < 90 mmHg
Nadir100	Minimum intradialytic SBP < 100 mmHg
Fall20	Pre‐HD SBP minus minimum intradialytic SBP ≥ 20 mmHg
Fall30	Pre‐HD SBP minus minimum intradialytic SBP ≥ 30 mmHg
Fall20Nadir90	Minimum intradialytic SBP < 90 mmHg and pre‐HD SBP‐minimum intradialytic SBP ≤ 20 mmHg
Fall30Nadir90	Minimum intradialytic SBP < 90 mmHg and pre‐HD SBP‐minimum intradialytic SBP ≤ 30 mmHg
KDOQI Guideline	Pre‐HD SBP minus minimum intradialytic SBP ≥ 20 mmHg plus symptoms of cramping, headache, light‐headedness, vomiting or chest pain during dialysis
HEMO Study	Fall in SBP resulting in intervention of UF reduction, blood flow reduction, or saline administration.

Adapted from Flythe 2015

HD ‐ haemodialysis; SBP ‐ systolic blood pressure; UF ‐ ultrafiltration