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. Author manuscript; available in PMC: 2023 Nov 1.
Published in final edited form as: J Physiol. 2022 Oct 5;600(22):4779–4806. doi: 10.1113/JP283319

Table 7.

Intra-class correlation coefficients (ICC) and Bland-Altman results between examined metrics in pigs (n = 17).

Metrics ICC Bland-Altman, 95% LOA
ICC Size 95% CI P Lower Upper
Metrics obtained from IVC occlusion
  Ees(IVC) vs. PRSW(IVC) 0.770* Good 0.347 −0.917 0.004 −1.728 1.728
  Ees(IVC) vs. dP/dtmax-EDV(IVC) 0.669* Moderate 0.051–0.882 0.020 −1.984 1.984
  PRSW(IVC) vs. dP/dtmax-EDV(IVC) 0.743* Moderate 0.270–0.908 0.006 −1.803 1.803
Ees(IVC) vs. single-beat surrogates of Ees(IVC)
  Ees(SB1) 0.444 - −0.310–0.785 0.095 −2.083 1.222
  Ees(SB2) 0.411 - −0.270–0.763 0.075 −2.277 0.963
PRSW(IVC) vs. single-beat surrogates of PRSW(IVC)
  PRSW(SB) 0.084 - −0.336–0.510 0.358 −10.856 40.519
  PWRmax-EDV 0.570 Moderate −0.245–0.847 0.058 −2.174 2.174
  PRWmax-EDV2 0.537 Moderate −0.386–0.831 0.083 −2.249 2.249
  LVEFEA1 0.033 - −1.987–0.663 0.475 −2.749 2.749
  LVEFEA2 0.034 - −1.984–0.663 0.474 −2.749 2.749
dP/dtmax-EDV(IVC) vs. single-beat surrogates of dP/dtmax-EDV
  LVdP/dtmax-EDV 0.574* Moderate −0.112–0.842 0.044 −24.773 17.654
  ARTdP/dtmax-EDV 0.284 - −0.360–0.690 0.162 −12.673 31.666
  Pmax-EDV 0.649* Moderate −0.007–0.875 0.026 −2.026 2.026
  LVESP-EDV 0.670* Moderate 0.055–0.882 0.020 −1.981 1.981
  ARTESP-EDV 0.585* Moderate −0.199–0.852 0.050 −2.148 2.148
Metrics obtained from ventricular vs. arterial beat-by-beat baseline data
  LVdP/dtmax-EDV vs. ARTdP/dtmax-EDV 0.373* Poor −0.141–0.767 0.001 2.641 23.47
  LVdP/dtmax-EDV vs. ARTESP-EDV 0.950* Excellent 0.860–0.982 < 0.001 −0.882 0.882
  Pmax-EDV vs. ARTdP/dtmax-EDV 0.902* Excellent 0.727–0.965 < 0.001 −1.199 1.199
  Pmax-EDV vs. ARTESP-EDV 0.986* Excellent 0.949–0.995 < 0.001 −0.206 0.112
  LVESP-EDV vs. ARTdP/dtmax-EDV 0.885* Good 0.679–0.959 < 0.001 −1.287 1.287
  LVESP-EDV vs. ARTESP-EDV 0.935* Excellent 0.570–0.988 < 0.001 −0.353 0.104
  Ees(SB1) vs. Ees(SB2) 0.961 Excellent 0.674–0.990 < 0.001 −2.871 1.819
  LVEFEA1 vs. LVEFEA2 0.955* Excellent 0.603–0.988 < 0.001 −10.403 3.185
  LVdP-dtmax vs. ARTdP-dtmax 0.077 - −0.085–0.355 0.148 236.704 1438.156
  LVdP/dtmax vs. ARTESP 0.716* Moderate 0.191–0.898 0.010 −1.874 1.874
  Pmax vs. ARTdP/dtmax 0.633* Moderate −0.055.869 0.031 −2.058 2.058
  Pmax vs. ARTESP 0.924* Excellent 0.756–0.974 < 0.001 −13.462 7.465
  LVESP vs. ARTESP 0.809* Good 0.065–0.91 < 0.001 −22.690 6.664

Ees(IVC), end-systolic elastance obtained from inferior venea cava (IVC) occlusion; PRSW(IVC), preload recruitable stork work obtained from IVC occlusion; dP/dtmax-EDV(IVC), the relation between the maximal rate of rise of pressure and end-diastolic volume (EDV) obtained from IVC occlusion; Ees(SB1), left ventricular (LV) end-systolic pressure (LVESP) and end-systolic volume (ESV) ratio; Ees(SB2), arterial ESP (ARTESP, 0.9 × systolic blood pressure (SBP)) and ESV ratio; PRSW(SB), stroke work (SW) and EDV ratio; PWRmax-EDV, power max (PWRmax) and EDV ratio; PWRmax-EDV2, PWRmax and squared of EDV ratio; LVEFEA1, afterload adjusted LV ejection fraction using ventricular data; LVEFEA2, afterload adjusted LV ejection fraction using arterial data; LVdP/dtmax-EDV, the maximal rate of rise of the left ventricular pressure (LVdP/dtmax) and EDV ratio; ARTdP/dtmax-EDV, the maximal rate of rise of the arterial pressure (ARTdP/dtmax) and EDV ratio; Pmax-EDV, maximal pressure (Pmax) and EDV ratio; LVESP-EDV, LVESP and EDV ratio; ARTESP-EDV, ARTESP and EDV ratio.

*

significant observation