Table 4.

Intra-class correlation coefficients (ICC), and Bland-Altman results between dP/dt_max-EDV_(IVC) obtained from inferior vena cava (IVC) occlusion and other single-beat surrogate metrics calculated from beat-by-beat baseline pressure-volume and arterial recordings in rats (n = 30).

	ICC				Bland-Altman, 95% LOA
	ICC	Size	95% CI	P	Lower	Upper
dP/dtmax-EDV(IVC) vs. single-beat surrogates of dP/dtmax-EDV(IVC)
LVdP/dtmax-EDV	0.700*	Moderate	−0.213–0.907	< 0.001	−46.584	5.876
ARTdP/dtmax-EDV	0.758*	Good	0.486–0.885	< 0.001	−44.93	28.184
Pmax-EDV	0.845*	Good	0.673–0.927	< 0.001	−1.452	1.452
LVESP-EDV	0.853*	Good	0.689–0.930	< 0.001	−1.421	1.421
ARTESP-EDV	0.822*	Good	0.624–0.916	< 0.001	−1.54	1.54
dP/dtmax-EDV(IVC) vs. other single-beat surrogates of cardiac contractility
Ees(SB1)	0.344	-	−0.414–0.691	0.138	−2.475	2.475
Ees(SB2)	0.313	-	−0.482–0.677	0.166	−2.509	2.509
PRSW(SB)	0.413	-	−0.262–0.723	0.084	−2.394	2.394
PWRmax-EDV	0.437	-	−0.210–0.735	0.069	−2.364	2.364
PRWmax-EDV2	0.691*	Moderate	0.343–0.854	0.001	−1.921	1.921
LVEFEA1	0.782*	Good	0.539–0.897	< 0.001	−1.675	1.675
LVEFEA2	0.743*	Moderate	0.455–0.878	< 0.001	−1.789	1.789
dP/dtmax-EDV(IVC) vs. load-dependent metrics
LVdP/dtmax	0.612*	Moderate	0.173–0.817	0.008	−2.087	2.087
ARTdP/dtmax	0.483*	Poor	−0.107–0.756	0.044	−2.3	2.3
Pmax	0.217	-	−0.696–0.632	0.263	−2.603	2.603
LVESP	0.200	-	−0.734–0.624	0.282	−2.618	2.618
ARTESP (0.9 × SBP)	0.061	-	−1.046–0.560	0.436	−2.729	2.729
PWRmax	−0.206	-	−1.656–0.438	0.685	−2.894	2.894
SW	−2.912	-	−8.653−−0.739	0.999	−3.464	3.464

dP/dt_max-EDV_(IVC), the relation between the maximal rate of rise of pressure and end-diastolic volume (EDV) obtained from IVC occlusion; _LVdP/dt_max-EDV, the maximal rate of rise of the left ventricular pressure (_LVdP/dt_max) and EDV ratio; _ARTdP/dt_max-EDV, the maximal rate of rise of the arterial pressure (_ARTdP/dt_max) and EDV ratio; P_max-EDV, maximal pressure (P_max) and EDV ratio; _LVESP-EDV, LV end-systolic pressure (_LVESP) and EDV ratio, _ARTESP-EDV, Arterial ESP (_ARTESP, 0.9 × systolic blood pressure (SBP) and EDV ratio; E_{es(SB1), LV}ESP and end-systolic volume (ESV) ratio; E_es(SB2), _ARTESP and ESV ratio; PRSW_(SB), stroke work (SW) and EDV ratio; PWR_max-EDV, power max (PWR_max) and EDV ratio; PWR_max-EDV², PWR_max and squared of EDV ratio; LVEF_EA1, afterload adjusted left ventricular ejection fraction using ventricular data; LVEF_EA2, afterload adjusted left ventricular ejection fraction using arterial data; LOA, limit of agreement.

^*significant observation