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. 2020 Feb 12;42(1):179–192. doi: 10.1080/0886022X.2020.1726384

Figure 1.

Figure 1.

(a) Relationship of change in CO to “net volume” change within CO interval and to IVC CI depicted as a 3-D scattergram with smoothing. Solid symbols indicate intermittent HD encounters and open symbols indicate continuous HD encounters. Upward triangles indicate CO increased > 10%, downward triangles indicate CO decreased > 10%, circles indicate CO changed −10% to +10%. Stars indicate CO “outliers” on the mesh plot. IVC CI < 20% was indicated as relative intravascular volume overload and IVC CI ≥ 20% as not volume overloaded. The flat plane indicates zero per cent change in CO. Sectors labeled A, B, C, D, E, and F correspond to Figure 1(b). (b) Relationship of IVC CI to “net volume” change between CO measurements, CO change, and intradialytic hypotension. Symbols are as in Figure 1(a). Encounter data are grouped based on IVC CI <20% versus ≥20%. The “net volume” change cutoffs were arbitrarily at −7 mL/kg and −30 mL/kg. The numbers inside of the symbols indicate the severity of intradialytic hypotension (IDH) (number 1 = IDH 2a, 2 = IDH 2b, 3 = IDH 3, and 4 = IDH 4). For IVC CI < 20%, sector A represents “net volume” change of < −7 mL/kg (n = 12), sector B represents “net volume” change −7 to −30 mL/kg (n = 24), and sector C represents “net volume” change of more than −30 mL/kg (n = 6). For IVC CI ≥ 20%, D represents “net volume” change of < −7 mL/kg (n = 8), E represents “net volume” change −7 to −30 mL/kg (n = 7), F represents “net volume” change of more than −30 mL/kg (n = 1).