PR Interval Adaptation in the Denervated Transplanted Heart
In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in w...
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| Autor*in: |
KOLLER-STRAMETZ, JEANETTE [verfasserIn] KRATOCHWILL, CHRISTOPH [verfasserIn] GRABENWÖGER, MARTIN [verfasserIn] |
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| Format: |
E-Artikel |
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| Erschienen: |
Oxford, UK: Blackwell Publishing Ltd ; 1997 |
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Online-Ressource |
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| Reproduktion: |
2006 ; Blackwell Publishing Journal Backfiles 1879-2005 |
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| Übergeordnetes Werk: |
In: Pacing and clinical electrophysiology - New York, NY [u.a.] : Wiley-Blackwell, 1978, 20(1997), 5, Seite 0 |
| Übergeordnetes Werk: |
volume:20 ; year:1997 ; number:5 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1111/j.1540-8159.1997.tb06777.x |
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NLEJ243921985 |
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| 520 | |a In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in workload till peak exercise. In 17 cases norepinephrine (NE) was assessed at rest, and at the end of each workload the MR increased from 99.3 ± 14 to 143.4 ± 25 beats/min at individual peak exercise, and NE increased from 1.307 ± 1,163 to 3.688 ± 2.036 pg/mL. while the PR interval shortened from 149.2 ± 13 to 119.3 ± 20 ms. On average. PR decreased by 3.4 ms for a 10-beat increase in HR, and the HR-PR interval relationship was described by a linear regression (y = 176.8–0.3469x, P = 0.0001). One patient who was unable to increase his NE levels upon exercise showed virtually no decrease in the PR interval and no HR increase. Both recipient age and donor age were moderately and significantly related to the minimum PR interval achieved at peak exercise (r = 0.6. P = 0.008 and r = 0.51. P = 0.049, respectively). These data show the following: (1) adaptation of the PR interval upon exercise does occur in the denervated transplanted heart; (2) the HR-PR relation is similar to that reported in the innervated heart; (3) the overall decline in PR interval is blunted, since denervated patients start at shorter resting PR intervals and achieve relatively longer PR intervals at peak exercise when compared to their innervated counterparts; (4) these exercise induced changes of the PR interval may be explained by circulating NE; and (5) NE levels achieved at peak exercise and the sensitivity of the AV node to NE seem to be age related. (PACE 1997; 20[Pt. I]:1247-1251) | ||
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10.1111/j.1540-8159.1997.tb06777.x doi (DE-627)NLEJ243921985 DE-627 ger DE-627 rakwb KOLLER-STRAMETZ, JEANETTE verfasserin aut PR Interval Adaptation in the Denervated Transplanted Heart Oxford, UK Blackwell Publishing Ltd 1997 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in workload till peak exercise. In 17 cases norepinephrine (NE) was assessed at rest, and at the end of each workload the MR increased from 99.3 ± 14 to 143.4 ± 25 beats/min at individual peak exercise, and NE increased from 1.307 ± 1,163 to 3.688 ± 2.036 pg/mL. while the PR interval shortened from 149.2 ± 13 to 119.3 ± 20 ms. On average. PR decreased by 3.4 ms for a 10-beat increase in HR, and the HR-PR interval relationship was described by a linear regression (y = 176.8–0.3469x, P = 0.0001). One patient who was unable to increase his NE levels upon exercise showed virtually no decrease in the PR interval and no HR increase. Both recipient age and donor age were moderately and significantly related to the minimum PR interval achieved at peak exercise (r = 0.6. P = 0.008 and r = 0.51. P = 0.049, respectively). These data show the following: (1) adaptation of the PR interval upon exercise does occur in the denervated transplanted heart; (2) the HR-PR relation is similar to that reported in the innervated heart; (3) the overall decline in PR interval is blunted, since denervated patients start at shorter resting PR intervals and achieve relatively longer PR intervals at peak exercise when compared to their innervated counterparts; (4) these exercise induced changes of the PR interval may be explained by circulating NE; and (5) NE levels achieved at peak exercise and the sensitivity of the AV node to NE seem to be age related. (PACE 1997; 20[Pt. I]:1247-1251) 2006 Blackwell Publishing Journal Backfiles 1879-2005 |2006|||||||||| AV interval KRATOCHWILL, CHRISTOPH verfasserin aut GRABENWÖGER, MARTIN verfasserin aut LAUFER, GÜNTHER oth PAGHER, RIGHARD oth GEMEINER, NORA oth GASIC, SLOBODAN oth HEINZ, GOTTFRIED oth In Pacing and clinical electrophysiology New York, NY [u.a.] : Wiley-Blackwell, 1978 20(1997), 5, Seite 0 Online-Ressource (DE-627)NLEJ243926928 (DE-600)2037547-5 1540-8159 nnns volume:20 year:1997 number:5 pages:0 http://dx.doi.org/10.1111/j.1540-8159.1997.tb06777.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 20 1997 5 0 |
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10.1111/j.1540-8159.1997.tb06777.x doi (DE-627)NLEJ243921985 DE-627 ger DE-627 rakwb KOLLER-STRAMETZ, JEANETTE verfasserin aut PR Interval Adaptation in the Denervated Transplanted Heart Oxford, UK Blackwell Publishing Ltd 1997 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in workload till peak exercise. In 17 cases norepinephrine (NE) was assessed at rest, and at the end of each workload the MR increased from 99.3 ± 14 to 143.4 ± 25 beats/min at individual peak exercise, and NE increased from 1.307 ± 1,163 to 3.688 ± 2.036 pg/mL. while the PR interval shortened from 149.2 ± 13 to 119.3 ± 20 ms. On average. PR decreased by 3.4 ms for a 10-beat increase in HR, and the HR-PR interval relationship was described by a linear regression (y = 176.8–0.3469x, P = 0.0001). One patient who was unable to increase his NE levels upon exercise showed virtually no decrease in the PR interval and no HR increase. Both recipient age and donor age were moderately and significantly related to the minimum PR interval achieved at peak exercise (r = 0.6. P = 0.008 and r = 0.51. P = 0.049, respectively). These data show the following: (1) adaptation of the PR interval upon exercise does occur in the denervated transplanted heart; (2) the HR-PR relation is similar to that reported in the innervated heart; (3) the overall decline in PR interval is blunted, since denervated patients start at shorter resting PR intervals and achieve relatively longer PR intervals at peak exercise when compared to their innervated counterparts; (4) these exercise induced changes of the PR interval may be explained by circulating NE; and (5) NE levels achieved at peak exercise and the sensitivity of the AV node to NE seem to be age related. (PACE 1997; 20[Pt. I]:1247-1251) 2006 Blackwell Publishing Journal Backfiles 1879-2005 |2006|||||||||| AV interval KRATOCHWILL, CHRISTOPH verfasserin aut GRABENWÖGER, MARTIN verfasserin aut LAUFER, GÜNTHER oth PAGHER, RIGHARD oth GEMEINER, NORA oth GASIC, SLOBODAN oth HEINZ, GOTTFRIED oth In Pacing and clinical electrophysiology New York, NY [u.a.] : Wiley-Blackwell, 1978 20(1997), 5, Seite 0 Online-Ressource (DE-627)NLEJ243926928 (DE-600)2037547-5 1540-8159 nnns volume:20 year:1997 number:5 pages:0 http://dx.doi.org/10.1111/j.1540-8159.1997.tb06777.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 20 1997 5 0 |
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10.1111/j.1540-8159.1997.tb06777.x doi (DE-627)NLEJ243921985 DE-627 ger DE-627 rakwb KOLLER-STRAMETZ, JEANETTE verfasserin aut PR Interval Adaptation in the Denervated Transplanted Heart Oxford, UK Blackwell Publishing Ltd 1997 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in workload till peak exercise. In 17 cases norepinephrine (NE) was assessed at rest, and at the end of each workload the MR increased from 99.3 ± 14 to 143.4 ± 25 beats/min at individual peak exercise, and NE increased from 1.307 ± 1,163 to 3.688 ± 2.036 pg/mL. while the PR interval shortened from 149.2 ± 13 to 119.3 ± 20 ms. On average. PR decreased by 3.4 ms for a 10-beat increase in HR, and the HR-PR interval relationship was described by a linear regression (y = 176.8–0.3469x, P = 0.0001). One patient who was unable to increase his NE levels upon exercise showed virtually no decrease in the PR interval and no HR increase. Both recipient age and donor age were moderately and significantly related to the minimum PR interval achieved at peak exercise (r = 0.6. P = 0.008 and r = 0.51. P = 0.049, respectively). These data show the following: (1) adaptation of the PR interval upon exercise does occur in the denervated transplanted heart; (2) the HR-PR relation is similar to that reported in the innervated heart; (3) the overall decline in PR interval is blunted, since denervated patients start at shorter resting PR intervals and achieve relatively longer PR intervals at peak exercise when compared to their innervated counterparts; (4) these exercise induced changes of the PR interval may be explained by circulating NE; and (5) NE levels achieved at peak exercise and the sensitivity of the AV node to NE seem to be age related. (PACE 1997; 20[Pt. I]:1247-1251) 2006 Blackwell Publishing Journal Backfiles 1879-2005 |2006|||||||||| AV interval KRATOCHWILL, CHRISTOPH verfasserin aut GRABENWÖGER, MARTIN verfasserin aut LAUFER, GÜNTHER oth PAGHER, RIGHARD oth GEMEINER, NORA oth GASIC, SLOBODAN oth HEINZ, GOTTFRIED oth In Pacing and clinical electrophysiology New York, NY [u.a.] : Wiley-Blackwell, 1978 20(1997), 5, Seite 0 Online-Ressource (DE-627)NLEJ243926928 (DE-600)2037547-5 1540-8159 nnns volume:20 year:1997 number:5 pages:0 http://dx.doi.org/10.1111/j.1540-8159.1997.tb06777.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 20 1997 5 0 |
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10.1111/j.1540-8159.1997.tb06777.x doi (DE-627)NLEJ243921985 DE-627 ger DE-627 rakwb KOLLER-STRAMETZ, JEANETTE verfasserin aut PR Interval Adaptation in the Denervated Transplanted Heart Oxford, UK Blackwell Publishing Ltd 1997 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in workload till peak exercise. In 17 cases norepinephrine (NE) was assessed at rest, and at the end of each workload the MR increased from 99.3 ± 14 to 143.4 ± 25 beats/min at individual peak exercise, and NE increased from 1.307 ± 1,163 to 3.688 ± 2.036 pg/mL. while the PR interval shortened from 149.2 ± 13 to 119.3 ± 20 ms. On average. PR decreased by 3.4 ms for a 10-beat increase in HR, and the HR-PR interval relationship was described by a linear regression (y = 176.8–0.3469x, P = 0.0001). One patient who was unable to increase his NE levels upon exercise showed virtually no decrease in the PR interval and no HR increase. Both recipient age and donor age were moderately and significantly related to the minimum PR interval achieved at peak exercise (r = 0.6. P = 0.008 and r = 0.51. P = 0.049, respectively). These data show the following: (1) adaptation of the PR interval upon exercise does occur in the denervated transplanted heart; (2) the HR-PR relation is similar to that reported in the innervated heart; (3) the overall decline in PR interval is blunted, since denervated patients start at shorter resting PR intervals and achieve relatively longer PR intervals at peak exercise when compared to their innervated counterparts; (4) these exercise induced changes of the PR interval may be explained by circulating NE; and (5) NE levels achieved at peak exercise and the sensitivity of the AV node to NE seem to be age related. (PACE 1997; 20[Pt. I]:1247-1251) 2006 Blackwell Publishing Journal Backfiles 1879-2005 |2006|||||||||| AV interval KRATOCHWILL, CHRISTOPH verfasserin aut GRABENWÖGER, MARTIN verfasserin aut LAUFER, GÜNTHER oth PAGHER, RIGHARD oth GEMEINER, NORA oth GASIC, SLOBODAN oth HEINZ, GOTTFRIED oth In Pacing and clinical electrophysiology New York, NY [u.a.] : Wiley-Blackwell, 1978 20(1997), 5, Seite 0 Online-Ressource (DE-627)NLEJ243926928 (DE-600)2037547-5 1540-8159 nnns volume:20 year:1997 number:5 pages:0 http://dx.doi.org/10.1111/j.1540-8159.1997.tb06777.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 20 1997 5 0 |
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10.1111/j.1540-8159.1997.tb06777.x doi (DE-627)NLEJ243921985 DE-627 ger DE-627 rakwb KOLLER-STRAMETZ, JEANETTE verfasserin aut PR Interval Adaptation in the Denervated Transplanted Heart Oxford, UK Blackwell Publishing Ltd 1997 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in workload till peak exercise. In 17 cases norepinephrine (NE) was assessed at rest, and at the end of each workload the MR increased from 99.3 ± 14 to 143.4 ± 25 beats/min at individual peak exercise, and NE increased from 1.307 ± 1,163 to 3.688 ± 2.036 pg/mL. while the PR interval shortened from 149.2 ± 13 to 119.3 ± 20 ms. On average. PR decreased by 3.4 ms for a 10-beat increase in HR, and the HR-PR interval relationship was described by a linear regression (y = 176.8–0.3469x, P = 0.0001). One patient who was unable to increase his NE levels upon exercise showed virtually no decrease in the PR interval and no HR increase. Both recipient age and donor age were moderately and significantly related to the minimum PR interval achieved at peak exercise (r = 0.6. P = 0.008 and r = 0.51. P = 0.049, respectively). These data show the following: (1) adaptation of the PR interval upon exercise does occur in the denervated transplanted heart; (2) the HR-PR relation is similar to that reported in the innervated heart; (3) the overall decline in PR interval is blunted, since denervated patients start at shorter resting PR intervals and achieve relatively longer PR intervals at peak exercise when compared to their innervated counterparts; (4) these exercise induced changes of the PR interval may be explained by circulating NE; and (5) NE levels achieved at peak exercise and the sensitivity of the AV node to NE seem to be age related. (PACE 1997; 20[Pt. I]:1247-1251) 2006 Blackwell Publishing Journal Backfiles 1879-2005 |2006|||||||||| AV interval KRATOCHWILL, CHRISTOPH verfasserin aut GRABENWÖGER, MARTIN verfasserin aut LAUFER, GÜNTHER oth PAGHER, RIGHARD oth GEMEINER, NORA oth GASIC, SLOBODAN oth HEINZ, GOTTFRIED oth In Pacing and clinical electrophysiology New York, NY [u.a.] : Wiley-Blackwell, 1978 20(1997), 5, Seite 0 Online-Ressource (DE-627)NLEJ243926928 (DE-600)2037547-5 1540-8159 nnns volume:20 year:1997 number:5 pages:0 http://dx.doi.org/10.1111/j.1540-8159.1997.tb06777.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 20 1997 5 0 |
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KOLLER-STRAMETZ, JEANETTE @@aut@@ KRATOCHWILL, CHRISTOPH @@aut@@ GRABENWÖGER, MARTIN @@aut@@ LAUFER, GÜNTHER @@oth@@ PAGHER, RIGHARD @@oth@@ GEMEINER, NORA @@oth@@ GASIC, SLOBODAN @@oth@@ HEINZ, GOTTFRIED @@oth@@ |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000caa a22002652 4500</leader><controlfield tag="001">NLEJ243921985</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20210707191459.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">120427s1997 xx |||||o 00| ||und c</controlfield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">10.1111/j.1540-8159.1997.tb06777.x</subfield><subfield code="2">doi</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)NLEJ243921985</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="100" ind1="1" ind2=" "><subfield code="a">KOLLER-STRAMETZ, JEANETTE</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">PR Interval Adaptation in the Denervated Transplanted Heart</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="a">Oxford, UK</subfield><subfield code="b">Blackwell Publishing Ltd</subfield><subfield code="c">1997</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zzz</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">z</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zu</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in workload till peak exercise. In 17 cases norepinephrine (NE) was assessed at rest, and at the end of each workload the MR increased from 99.3 ± 14 to 143.4 ± 25 beats/min at individual peak exercise, and NE increased from 1.307 ± 1,163 to 3.688 ± 2.036 pg/mL. while the PR interval shortened from 149.2 ± 13 to 119.3 ± 20 ms. On average. PR decreased by 3.4 ms for a 10-beat increase in HR, and the HR-PR interval relationship was described by a linear regression (y = 176.8–0.3469x, P = 0.0001). One patient who was unable to increase his NE levels upon exercise showed virtually no decrease in the PR interval and no HR increase. Both recipient age and donor age were moderately and significantly related to the minimum PR interval achieved at peak exercise (r = 0.6. P = 0.008 and r = 0.51. P = 0.049, respectively). These data show the following: (1) adaptation of the PR interval upon exercise does occur in the denervated transplanted heart; (2) the HR-PR relation is similar to that reported in the innervated heart; (3) the overall decline in PR interval is blunted, since denervated patients start at shorter resting PR intervals and achieve relatively longer PR intervals at peak exercise when compared to their innervated counterparts; (4) these exercise induced changes of the PR interval may be explained by circulating NE; and (5) NE levels achieved at peak exercise and the sensitivity of the AV node to NE seem to be age related. (PACE 1997; 20[Pt. 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pr interval adaptation in the denervated transplanted heart |
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PR Interval Adaptation in the Denervated Transplanted Heart |
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In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in workload till peak exercise. In 17 cases norepinephrine (NE) was assessed at rest, and at the end of each workload the MR increased from 99.3 ± 14 to 143.4 ± 25 beats/min at individual peak exercise, and NE increased from 1.307 ± 1,163 to 3.688 ± 2.036 pg/mL. while the PR interval shortened from 149.2 ± 13 to 119.3 ± 20 ms. On average. PR decreased by 3.4 ms for a 10-beat increase in HR, and the HR-PR interval relationship was described by a linear regression (y = 176.8–0.3469x, P = 0.0001). One patient who was unable to increase his NE levels upon exercise showed virtually no decrease in the PR interval and no HR increase. Both recipient age and donor age were moderately and significantly related to the minimum PR interval achieved at peak exercise (r = 0.6. P = 0.008 and r = 0.51. P = 0.049, respectively). These data show the following: (1) adaptation of the PR interval upon exercise does occur in the denervated transplanted heart; (2) the HR-PR relation is similar to that reported in the innervated heart; (3) the overall decline in PR interval is blunted, since denervated patients start at shorter resting PR intervals and achieve relatively longer PR intervals at peak exercise when compared to their innervated counterparts; (4) these exercise induced changes of the PR interval may be explained by circulating NE; and (5) NE levels achieved at peak exercise and the sensitivity of the AV node to NE seem to be age related. (PACE 1997; 20[Pt. I]:1247-1251) |
| abstractGer |
In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in workload till peak exercise. In 17 cases norepinephrine (NE) was assessed at rest, and at the end of each workload the MR increased from 99.3 ± 14 to 143.4 ± 25 beats/min at individual peak exercise, and NE increased from 1.307 ± 1,163 to 3.688 ± 2.036 pg/mL. while the PR interval shortened from 149.2 ± 13 to 119.3 ± 20 ms. On average. PR decreased by 3.4 ms for a 10-beat increase in HR, and the HR-PR interval relationship was described by a linear regression (y = 176.8–0.3469x, P = 0.0001). One patient who was unable to increase his NE levels upon exercise showed virtually no decrease in the PR interval and no HR increase. Both recipient age and donor age were moderately and significantly related to the minimum PR interval achieved at peak exercise (r = 0.6. P = 0.008 and r = 0.51. P = 0.049, respectively). These data show the following: (1) adaptation of the PR interval upon exercise does occur in the denervated transplanted heart; (2) the HR-PR relation is similar to that reported in the innervated heart; (3) the overall decline in PR interval is blunted, since denervated patients start at shorter resting PR intervals and achieve relatively longer PR intervals at peak exercise when compared to their innervated counterparts; (4) these exercise induced changes of the PR interval may be explained by circulating NE; and (5) NE levels achieved at peak exercise and the sensitivity of the AV node to NE seem to be age related. (PACE 1997; 20[Pt. I]:1247-1251) |
| abstract_unstemmed |
In the present study, the dynamic PR response upon standardized treadmill exercise was investigated in 21 transplant recipients (recipient age 48 ± 17 years, donor age 31 ± 12 years, > 1 year after transplantation). MR and PR interval were measured at rest and at the end of each 25-Wincrease in workload till peak exercise. In 17 cases norepinephrine (NE) was assessed at rest, and at the end of each workload the MR increased from 99.3 ± 14 to 143.4 ± 25 beats/min at individual peak exercise, and NE increased from 1.307 ± 1,163 to 3.688 ± 2.036 pg/mL. while the PR interval shortened from 149.2 ± 13 to 119.3 ± 20 ms. On average. PR decreased by 3.4 ms for a 10-beat increase in HR, and the HR-PR interval relationship was described by a linear regression (y = 176.8–0.3469x, P = 0.0001). One patient who was unable to increase his NE levels upon exercise showed virtually no decrease in the PR interval and no HR increase. Both recipient age and donor age were moderately and significantly related to the minimum PR interval achieved at peak exercise (r = 0.6. P = 0.008 and r = 0.51. P = 0.049, respectively). These data show the following: (1) adaptation of the PR interval upon exercise does occur in the denervated transplanted heart; (2) the HR-PR relation is similar to that reported in the innervated heart; (3) the overall decline in PR interval is blunted, since denervated patients start at shorter resting PR intervals and achieve relatively longer PR intervals at peak exercise when compared to their innervated counterparts; (4) these exercise induced changes of the PR interval may be explained by circulating NE; and (5) NE levels achieved at peak exercise and the sensitivity of the AV node to NE seem to be age related. (PACE 1997; 20[Pt. I]:1247-1251) |
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