Effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension
Abstract In 11 pigs under general endotracheal anaesthesia, the time-domain method of determining the pulmonary arterial input impedance was compared with the frequency-domain equivalent under normal conditions as well as acute pulmonary hypertension induced by glass microspheres. The time-domain me...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Fourie, P. R. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1993 |
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| Schlagwörter: |
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| Anmerkung: |
© IFMBE 1993 |
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| Übergeordnetes Werk: |
Enthalten in: Medical & biological engineering & computing - Kluwer Academic Publishers, 1977, 31(1993), 5 vom: Sept., Seite 468-474 |
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| Übergeordnetes Werk: |
volume:31 ; year:1993 ; number:5 ; month:09 ; pages:468-474 |
| Links: |
|---|
| DOI / URN: |
10.1007/BF02441981 |
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| Katalog-ID: |
OLC2038667861 |
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| 100 | 1 | |a Fourie, P. R. |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension |
| 264 | 1 | |c 1993 | |
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| 520 | |a Abstract In 11 pigs under general endotracheal anaesthesia, the time-domain method of determining the pulmonary arterial input impedance was compared with the frequency-domain equivalent under normal conditions as well as acute pulmonary hypertension induced by glass microspheres. The time-domain methods of determining the pulmonary arterial compliance C and pulmonary vascular bed resistance $ R_{p} $ compared favourably with the frequency-domain equivalent (r=0·744, n=60, p<0·001 and r=0·906, n=60, p<0·001, respectively), even at mean pulmonary artery pressures (MPAP) of 35 mmHg and above. A consistent and everincreasing difference between characteristic impedance $ Z_{o} $(ω), estimated by averaging input impedance modulus values over a selected frequency range, and its time domain equivalent $ R_{o} $ with increasing MPAP was shown to be the cause of the poor fit between the measured and remodelled pulmonary blood flow. By analysing a time-domain estimate of the pulmonary characteristic impedance $ R_{o} $(C, $ R_{p} $, t), it was demonstrated that the characteristic impedance was dependent on C. $ R_{o} $ is therefore not an accurate representation of the characteristic impedance, especially under conditions of acute pulmonary hypertension. $ R_{o} $ (C, $ R_{p} $, t) should therefore be calculated instead. | ||
| 650 | 4 | |a Acute pulmonary hypertension | |
| 650 | 4 | |a Characteristic impedance | |
| 650 | 4 | |a Pulmonary artery compliance | |
| 650 | 4 | |a Pulmonary artery input impedance | |
| 700 | 1 | |a Coetzee, A. R. |4 aut | |
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10.1007/BF02441981 doi (DE-627)OLC2038667861 (DE-He213)BF02441981-p DE-627 ger DE-627 rakwb eng 610 660 570 VZ 12 ssgn Fourie, P. R. verfasserin aut Effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © IFMBE 1993 Abstract In 11 pigs under general endotracheal anaesthesia, the time-domain method of determining the pulmonary arterial input impedance was compared with the frequency-domain equivalent under normal conditions as well as acute pulmonary hypertension induced by glass microspheres. The time-domain methods of determining the pulmonary arterial compliance C and pulmonary vascular bed resistance $ R_{p} $ compared favourably with the frequency-domain equivalent (r=0·744, n=60, p<0·001 and r=0·906, n=60, p<0·001, respectively), even at mean pulmonary artery pressures (MPAP) of 35 mmHg and above. A consistent and everincreasing difference between characteristic impedance $ Z_{o} $(ω), estimated by averaging input impedance modulus values over a selected frequency range, and its time domain equivalent $ R_{o} $ with increasing MPAP was shown to be the cause of the poor fit between the measured and remodelled pulmonary blood flow. By analysing a time-domain estimate of the pulmonary characteristic impedance $ R_{o} $(C, $ R_{p} $, t), it was demonstrated that the characteristic impedance was dependent on C. $ R_{o} $ is therefore not an accurate representation of the characteristic impedance, especially under conditions of acute pulmonary hypertension. $ R_{o} $ (C, $ R_{p} $, t) should therefore be calculated instead. Acute pulmonary hypertension Characteristic impedance Pulmonary artery compliance Pulmonary artery input impedance Coetzee, A. R. aut Enthalten in Medical & biological engineering & computing Kluwer Academic Publishers, 1977 31(1993), 5 vom: Sept., Seite 468-474 (DE-627)129858552 (DE-600)282327-5 (DE-576)015165507 0140-0118 nnns volume:31 year:1993 number:5 month:09 pages:468-474 https://doi.org/10.1007/BF02441981 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-MAT GBV_ILN_11 GBV_ILN_32 GBV_ILN_34 GBV_ILN_65 GBV_ILN_70 GBV_ILN_105 GBV_ILN_2006 GBV_ILN_2010 GBV_ILN_2021 GBV_ILN_4012 GBV_ILN_4028 GBV_ILN_4046 GBV_ILN_4219 GBV_ILN_4306 GBV_ILN_4317 GBV_ILN_4700 AR 31 1993 5 09 468-474 |
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10.1007/BF02441981 doi (DE-627)OLC2038667861 (DE-He213)BF02441981-p DE-627 ger DE-627 rakwb eng 610 660 570 VZ 12 ssgn Fourie, P. R. verfasserin aut Effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © IFMBE 1993 Abstract In 11 pigs under general endotracheal anaesthesia, the time-domain method of determining the pulmonary arterial input impedance was compared with the frequency-domain equivalent under normal conditions as well as acute pulmonary hypertension induced by glass microspheres. The time-domain methods of determining the pulmonary arterial compliance C and pulmonary vascular bed resistance $ R_{p} $ compared favourably with the frequency-domain equivalent (r=0·744, n=60, p<0·001 and r=0·906, n=60, p<0·001, respectively), even at mean pulmonary artery pressures (MPAP) of 35 mmHg and above. A consistent and everincreasing difference between characteristic impedance $ Z_{o} $(ω), estimated by averaging input impedance modulus values over a selected frequency range, and its time domain equivalent $ R_{o} $ with increasing MPAP was shown to be the cause of the poor fit between the measured and remodelled pulmonary blood flow. By analysing a time-domain estimate of the pulmonary characteristic impedance $ R_{o} $(C, $ R_{p} $, t), it was demonstrated that the characteristic impedance was dependent on C. $ R_{o} $ is therefore not an accurate representation of the characteristic impedance, especially under conditions of acute pulmonary hypertension. $ R_{o} $ (C, $ R_{p} $, t) should therefore be calculated instead. Acute pulmonary hypertension Characteristic impedance Pulmonary artery compliance Pulmonary artery input impedance Coetzee, A. R. aut Enthalten in Medical & biological engineering & computing Kluwer Academic Publishers, 1977 31(1993), 5 vom: Sept., Seite 468-474 (DE-627)129858552 (DE-600)282327-5 (DE-576)015165507 0140-0118 nnns volume:31 year:1993 number:5 month:09 pages:468-474 https://doi.org/10.1007/BF02441981 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-MAT GBV_ILN_11 GBV_ILN_32 GBV_ILN_34 GBV_ILN_65 GBV_ILN_70 GBV_ILN_105 GBV_ILN_2006 GBV_ILN_2010 GBV_ILN_2021 GBV_ILN_4012 GBV_ILN_4028 GBV_ILN_4046 GBV_ILN_4219 GBV_ILN_4306 GBV_ILN_4317 GBV_ILN_4700 AR 31 1993 5 09 468-474 |
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10.1007/BF02441981 doi (DE-627)OLC2038667861 (DE-He213)BF02441981-p DE-627 ger DE-627 rakwb eng 610 660 570 VZ 12 ssgn Fourie, P. R. verfasserin aut Effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © IFMBE 1993 Abstract In 11 pigs under general endotracheal anaesthesia, the time-domain method of determining the pulmonary arterial input impedance was compared with the frequency-domain equivalent under normal conditions as well as acute pulmonary hypertension induced by glass microspheres. The time-domain methods of determining the pulmonary arterial compliance C and pulmonary vascular bed resistance $ R_{p} $ compared favourably with the frequency-domain equivalent (r=0·744, n=60, p<0·001 and r=0·906, n=60, p<0·001, respectively), even at mean pulmonary artery pressures (MPAP) of 35 mmHg and above. A consistent and everincreasing difference between characteristic impedance $ Z_{o} $(ω), estimated by averaging input impedance modulus values over a selected frequency range, and its time domain equivalent $ R_{o} $ with increasing MPAP was shown to be the cause of the poor fit between the measured and remodelled pulmonary blood flow. By analysing a time-domain estimate of the pulmonary characteristic impedance $ R_{o} $(C, $ R_{p} $, t), it was demonstrated that the characteristic impedance was dependent on C. $ R_{o} $ is therefore not an accurate representation of the characteristic impedance, especially under conditions of acute pulmonary hypertension. $ R_{o} $ (C, $ R_{p} $, t) should therefore be calculated instead. Acute pulmonary hypertension Characteristic impedance Pulmonary artery compliance Pulmonary artery input impedance Coetzee, A. R. aut Enthalten in Medical & biological engineering & computing Kluwer Academic Publishers, 1977 31(1993), 5 vom: Sept., Seite 468-474 (DE-627)129858552 (DE-600)282327-5 (DE-576)015165507 0140-0118 nnns volume:31 year:1993 number:5 month:09 pages:468-474 https://doi.org/10.1007/BF02441981 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-MAT GBV_ILN_11 GBV_ILN_32 GBV_ILN_34 GBV_ILN_65 GBV_ILN_70 GBV_ILN_105 GBV_ILN_2006 GBV_ILN_2010 GBV_ILN_2021 GBV_ILN_4012 GBV_ILN_4028 GBV_ILN_4046 GBV_ILN_4219 GBV_ILN_4306 GBV_ILN_4317 GBV_ILN_4700 AR 31 1993 5 09 468-474 |
| allfieldsGer |
10.1007/BF02441981 doi (DE-627)OLC2038667861 (DE-He213)BF02441981-p DE-627 ger DE-627 rakwb eng 610 660 570 VZ 12 ssgn Fourie, P. R. verfasserin aut Effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © IFMBE 1993 Abstract In 11 pigs under general endotracheal anaesthesia, the time-domain method of determining the pulmonary arterial input impedance was compared with the frequency-domain equivalent under normal conditions as well as acute pulmonary hypertension induced by glass microspheres. The time-domain methods of determining the pulmonary arterial compliance C and pulmonary vascular bed resistance $ R_{p} $ compared favourably with the frequency-domain equivalent (r=0·744, n=60, p<0·001 and r=0·906, n=60, p<0·001, respectively), even at mean pulmonary artery pressures (MPAP) of 35 mmHg and above. A consistent and everincreasing difference between characteristic impedance $ Z_{o} $(ω), estimated by averaging input impedance modulus values over a selected frequency range, and its time domain equivalent $ R_{o} $ with increasing MPAP was shown to be the cause of the poor fit between the measured and remodelled pulmonary blood flow. By analysing a time-domain estimate of the pulmonary characteristic impedance $ R_{o} $(C, $ R_{p} $, t), it was demonstrated that the characteristic impedance was dependent on C. $ R_{o} $ is therefore not an accurate representation of the characteristic impedance, especially under conditions of acute pulmonary hypertension. $ R_{o} $ (C, $ R_{p} $, t) should therefore be calculated instead. Acute pulmonary hypertension Characteristic impedance Pulmonary artery compliance Pulmonary artery input impedance Coetzee, A. R. aut Enthalten in Medical & biological engineering & computing Kluwer Academic Publishers, 1977 31(1993), 5 vom: Sept., Seite 468-474 (DE-627)129858552 (DE-600)282327-5 (DE-576)015165507 0140-0118 nnns volume:31 year:1993 number:5 month:09 pages:468-474 https://doi.org/10.1007/BF02441981 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-MAT GBV_ILN_11 GBV_ILN_32 GBV_ILN_34 GBV_ILN_65 GBV_ILN_70 GBV_ILN_105 GBV_ILN_2006 GBV_ILN_2010 GBV_ILN_2021 GBV_ILN_4012 GBV_ILN_4028 GBV_ILN_4046 GBV_ILN_4219 GBV_ILN_4306 GBV_ILN_4317 GBV_ILN_4700 AR 31 1993 5 09 468-474 |
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10.1007/BF02441981 doi (DE-627)OLC2038667861 (DE-He213)BF02441981-p DE-627 ger DE-627 rakwb eng 610 660 570 VZ 12 ssgn Fourie, P. R. verfasserin aut Effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © IFMBE 1993 Abstract In 11 pigs under general endotracheal anaesthesia, the time-domain method of determining the pulmonary arterial input impedance was compared with the frequency-domain equivalent under normal conditions as well as acute pulmonary hypertension induced by glass microspheres. The time-domain methods of determining the pulmonary arterial compliance C and pulmonary vascular bed resistance $ R_{p} $ compared favourably with the frequency-domain equivalent (r=0·744, n=60, p<0·001 and r=0·906, n=60, p<0·001, respectively), even at mean pulmonary artery pressures (MPAP) of 35 mmHg and above. A consistent and everincreasing difference between characteristic impedance $ Z_{o} $(ω), estimated by averaging input impedance modulus values over a selected frequency range, and its time domain equivalent $ R_{o} $ with increasing MPAP was shown to be the cause of the poor fit between the measured and remodelled pulmonary blood flow. By analysing a time-domain estimate of the pulmonary characteristic impedance $ R_{o} $(C, $ R_{p} $, t), it was demonstrated that the characteristic impedance was dependent on C. $ R_{o} $ is therefore not an accurate representation of the characteristic impedance, especially under conditions of acute pulmonary hypertension. $ R_{o} $ (C, $ R_{p} $, t) should therefore be calculated instead. Acute pulmonary hypertension Characteristic impedance Pulmonary artery compliance Pulmonary artery input impedance Coetzee, A. R. aut Enthalten in Medical & biological engineering & computing Kluwer Academic Publishers, 1977 31(1993), 5 vom: Sept., Seite 468-474 (DE-627)129858552 (DE-600)282327-5 (DE-576)015165507 0140-0118 nnns volume:31 year:1993 number:5 month:09 pages:468-474 https://doi.org/10.1007/BF02441981 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-MAT GBV_ILN_11 GBV_ILN_32 GBV_ILN_34 GBV_ILN_65 GBV_ILN_70 GBV_ILN_105 GBV_ILN_2006 GBV_ILN_2010 GBV_ILN_2021 GBV_ILN_4012 GBV_ILN_4028 GBV_ILN_4046 GBV_ILN_4219 GBV_ILN_4306 GBV_ILN_4317 GBV_ILN_4700 AR 31 1993 5 09 468-474 |
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Enthalten in Medical & biological engineering & computing 31(1993), 5 vom: Sept., Seite 468-474 volume:31 year:1993 number:5 month:09 pages:468-474 |
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Effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension |
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Effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension |
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effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension |
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Effect of compliance on a time-domain estimate of the characteristic impedance of the pulmonary artery during acute pulmonary hypertension |
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Abstract In 11 pigs under general endotracheal anaesthesia, the time-domain method of determining the pulmonary arterial input impedance was compared with the frequency-domain equivalent under normal conditions as well as acute pulmonary hypertension induced by glass microspheres. The time-domain methods of determining the pulmonary arterial compliance C and pulmonary vascular bed resistance $ R_{p} $ compared favourably with the frequency-domain equivalent (r=0·744, n=60, p<0·001 and r=0·906, n=60, p<0·001, respectively), even at mean pulmonary artery pressures (MPAP) of 35 mmHg and above. A consistent and everincreasing difference between characteristic impedance $ Z_{o} $(ω), estimated by averaging input impedance modulus values over a selected frequency range, and its time domain equivalent $ R_{o} $ with increasing MPAP was shown to be the cause of the poor fit between the measured and remodelled pulmonary blood flow. By analysing a time-domain estimate of the pulmonary characteristic impedance $ R_{o} $(C, $ R_{p} $, t), it was demonstrated that the characteristic impedance was dependent on C. $ R_{o} $ is therefore not an accurate representation of the characteristic impedance, especially under conditions of acute pulmonary hypertension. $ R_{o} $ (C, $ R_{p} $, t) should therefore be calculated instead. © IFMBE 1993 |
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Abstract In 11 pigs under general endotracheal anaesthesia, the time-domain method of determining the pulmonary arterial input impedance was compared with the frequency-domain equivalent under normal conditions as well as acute pulmonary hypertension induced by glass microspheres. The time-domain methods of determining the pulmonary arterial compliance C and pulmonary vascular bed resistance $ R_{p} $ compared favourably with the frequency-domain equivalent (r=0·744, n=60, p<0·001 and r=0·906, n=60, p<0·001, respectively), even at mean pulmonary artery pressures (MPAP) of 35 mmHg and above. A consistent and everincreasing difference between characteristic impedance $ Z_{o} $(ω), estimated by averaging input impedance modulus values over a selected frequency range, and its time domain equivalent $ R_{o} $ with increasing MPAP was shown to be the cause of the poor fit between the measured and remodelled pulmonary blood flow. By analysing a time-domain estimate of the pulmonary characteristic impedance $ R_{o} $(C, $ R_{p} $, t), it was demonstrated that the characteristic impedance was dependent on C. $ R_{o} $ is therefore not an accurate representation of the characteristic impedance, especially under conditions of acute pulmonary hypertension. $ R_{o} $ (C, $ R_{p} $, t) should therefore be calculated instead. © IFMBE 1993 |
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Abstract In 11 pigs under general endotracheal anaesthesia, the time-domain method of determining the pulmonary arterial input impedance was compared with the frequency-domain equivalent under normal conditions as well as acute pulmonary hypertension induced by glass microspheres. The time-domain methods of determining the pulmonary arterial compliance C and pulmonary vascular bed resistance $ R_{p} $ compared favourably with the frequency-domain equivalent (r=0·744, n=60, p<0·001 and r=0·906, n=60, p<0·001, respectively), even at mean pulmonary artery pressures (MPAP) of 35 mmHg and above. A consistent and everincreasing difference between characteristic impedance $ Z_{o} $(ω), estimated by averaging input impedance modulus values over a selected frequency range, and its time domain equivalent $ R_{o} $ with increasing MPAP was shown to be the cause of the poor fit between the measured and remodelled pulmonary blood flow. By analysing a time-domain estimate of the pulmonary characteristic impedance $ R_{o} $(C, $ R_{p} $, t), it was demonstrated that the characteristic impedance was dependent on C. $ R_{o} $ is therefore not an accurate representation of the characteristic impedance, especially under conditions of acute pulmonary hypertension. $ R_{o} $ (C, $ R_{p} $, t) should therefore be calculated instead. © IFMBE 1993 |
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