Understanding diastolic function mandates feasible and accurate methods to construct and compare the diastolic pressure (P)-volume (V) relationship (PVR). This study compared the relaxation-corrected single beat (RC-SB) to the multiple-beat (MB) (vena cava occlusion) method for constructing the diastolic PVR in 26 young normal or old hypertensive dogs before and after increases in afterload (phenylephrine) or acute volume expansion in the presence (n = 14) or absence (n = 12) of the pericardium. The PVR data were fit to P = αe β·V. Derived stiffness indexes compared included the stiffness coefficient (β), curve-fitting constant (α), and the end-diastolic volume (EDV) at 10, 20, or 30 mmHg [EDVx = ln(P x/α)/β] to account for covariance in α and β. In pericardium-intact young normal and old hypertensive dogs studied over varying afterloads, the MB and RC-SB PVR appeared identical. The β (r = 0.62) and α (r = 0.69) derived from the RC-SB vs. MB PVR showed moderate correlation but poor agreement. In contrast, the EDV10-30 derived from RC-SB vs. MB PVR showed excellent correlation (r = 0.97) and agreement. The uncorrected SB method underestimated stiffness. As expected, after acute volume expansion, the RC-SB PVR was shifted upward from the MB PVR (decreased EDV 10-30; P < 0.05) in the pericardium-intact but not pericardium-absent dogs. The RC-SB method can substitute for the MB technique in construction of PVR in the absence of acute volume expansion. The concordance between these two methods was poorly reflected by comparing the derived α and β but apparent when using EDV10-30, which provides information regarding the position of the PVR in a single number.
|Original language||English (US)|
|Journal||American Journal of Physiology - Heart and Circulatory Physiology|
|State||Published - Nov 2007|
- Heart failure
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine
- Physiology (medical)