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- W2078121175 abstract "To determine whether pulmonary vascular obstructive disease (PVOD) is reflected by the pulmonary input impedance spectrum, pulmonary artery pressure (PAP) and flow (Q) were recorded intraoperatively in 30 children. Mean PAP and Q, pulmonary vascular resistance (PVR), impedance spectra, characteristic impedance (Z0), and the frequency of the first modulus minimum (fm) were calculated. Patient groups were: normal PAP and PVR (Group I—25 patients), high PAP and PVR with no microscopic PVOD (Group II—2 patients), and patients with high PAP and PVR and Grade III PVOD (Group III—3 patients). Impedance spectra of the groups were strikingly different. Mean Group I values of Z0 and fm were 115 dyn-sec-cm−5 and 2.6 Hz, respectively. Z0 values were elevated for Group II (524 dyn-sec-cm−5) but high-normal for Group III (157 dyn-sec-cm−5);fm values were normal for Group II (3.5 Hz) but higher for Group III (6.9 Hz). Results indicate that the impedance spectrum may provide a prognostic tool for identifying patients in whom PVOD is irreversible." @default.
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- W2078121175 date "1980-07-01" @default.
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- W2078121175 title "Pulmonary input impedance in children with left-right shunt" @default.
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- W2078121175 doi "https://doi.org/10.1016/0022-4804(80)90007-4" @default.
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