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Cardiovascular Biophysics Laboratory, Washington University School of Medicine, St. Louis, Missouri 63110
A chamber
stiffness (KLV)-transmitral flow (E-wave)
deceleration time relation has been invasively validated in dogs with the use of average stiffness [(
P/
V)avg].
KLV is equivalent to kE,
the (E-wave) stiffness of the parameterized diastolic filling model.
Prediction and validation of 1) (
P/
V)avg
in terms of kE, 2) early
rapid-filling stiffness [(
P/
V)E] in terms of
kE, and 3) passive (postdiastasis)
chamber stiffness [(
P/
V)PD] from A waves in terms
of the stiffness parameter for the Doppler A wave
(kA) have not been achieved. Simultaneous
micromanometric left ventricular (LV) pressure (LVP) and transmitral
flow from 131 subjects were analyzed. (
P)avg and
(
V)avg utilized the minimum LVP-LV end-diastolic
pressure interval. (
P/
V)E utilized
P and
V from
minimum LVP to E-wave termination. (
P/
V)PD utilized atrial systolic
P and
V. E- and A-wave analysis generated
kE and kA. For all
subjects, noninvasive-invasive relations yielded the following
equations: kE = 1,401 · (
P/
V)avg + 59.2 (r = 0.84) and kE = 229.0 · (
P/
V)E + 112 (r = 0.80). For subjects with diastasis (n = 113),
kA = 1,640 · (
P/
V)PD
8.40 (r = 0.89). As predicted, kA
showed excellent correlation with (
P/
V)PD; kE correlated highly with
(
P/
V)avg. In vivo validation of average, early, and
passive chamber stiffness facilitates quantitative, noninvasive
diastolic function assessment from transmitral flow.
diastole; echocardiography; hemodynamics; ventricles; mathematical modeling
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