Root Diameter

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Iftikhar J Kullo - One of the best experts on this subject based on the ideXlab platform.

  • plasma c terminal pro endothelin 1 is associated with left ventricular mass index and aortic Root Diameter in african american adults with hypertension
    Journal of Human Hypertension, 2011
    Co-Authors: Malik A Alomari, Mahyar Khaleghi, Thomas H Mosley, Nils G Morgenthaler, Joachim Struck, Andreas Bergmann, Iftikhar J Kullo
    Abstract:

    Endothelin-1 (ET-1), a circulating vasoactive peptide with potent vasoconstricting and mitogenic properties, may contribute to target-organ damage in hypertension. We investigated whether plasma levels of C-terminal pro-endothelin-1 (CT-pro-ET-1) are associated with left ventricular (LV) mass and aortic Root Diameter in African-American adults with hypertension. Plasma CT-pro-ET-1 was measured by an immunoluminometric assay in 1041 African Americans (65±9 years, 72% women) with hypertension. LV mass and aortic Root Diameter were measured according to the American Society of Echocardiography guidelines, and LV mass was indexed by height to the power 2.7 (LVMi). Multivariable regression analyses were used to assess whether plasma CT-pro-ET-1 was associated with LVMi and aortic Root Diameter, independent of potential confounding variables. Plasma CT-pro-ET-1 was modestly correlated with LVMi (r=0.21, P<0.0001) and aortic Root Diameter (r=0.09, P=0.004). In separate multivariable regression models that adjusted for age, sex, body mass index, total and high-density lipoprotein cholesterol, smoking history, diabetes, history of myocardial infarction or stroke, and blood pressure-lowering medication and statin use, log CT-pro-ET-1 was significantly associated with greater LVMi (P=0.001) and larger aortic Root Diameter (P=0.006). CT-pro-ET-1 is independently associated with LVMi and aortic Root Diameter and may be a marker of target-organ damage in African-Americans adults with hypertension.

  • Plasma C-terminal pro-endothelin-1 is associated with left ventricular mass index and aortic Root Diameter in African-American adults with hypertension.
    Journal of human hypertension, 2010
    Co-Authors: Malik A. Al-omari, Mahyar Khaleghi, Thomas H Mosley, Nils G Morgenthaler, Joachim Struck, Andreas Bergmann, Iftikhar J Kullo
    Abstract:

    Endothelin-1 (ET-1), a circulating vasoactive peptide with potent vasoconstricting and mitogenic properties, may contribute to target-organ damage in hypertension. We investigated whether plasma levels of C-terminal pro-endothelin-1 (CT-pro-ET-1) are associated with left ventricular (LV) mass and aortic Root Diameter in African-American adults with hypertension. Plasma CT-pro-ET-1 was measured by an immunoluminometric assay in 1041 African Americans (65±9 years, 72% women) with hypertension. LV mass and aortic Root Diameter were measured according to the American Society of Echocardiography guidelines, and LV mass was indexed by height to the power 2.7 (LVMi). Multivariable regression analyses were used to assess whether plasma CT-pro-ET-1 was associated with LVMi and aortic Root Diameter, independent of potential confounding variables. Plasma CT-pro-ET-1 was modestly correlated with LVMi (r=0.21, P

A Haverich - One of the best experts on this subject based on the ideXlab platform.

  • Impact of preoperative aortic Root Diameter on long-term aortic valve function after valve sparing aortic Root reimplantation.
    Circulation, 2003
    Co-Authors: R G Leyh, K Kallenbach, M Karck, C Hagl, S Fischer, A Haverich
    Abstract:

    Valve sparing aortic Root reimplantation technique in patients with aortic Root aneurysm have shown excellent mid-term results. In conjunction with the Diameter of the aortic Root the mechanical leaflet stress increase, which might have an impact on long-term aortic valve function after valve sparing aortic Root reimplantation. From July 1993 to October 2001, 168 patients with aortic Root aneurysm underwent valve sparing aortic Root reimplantation. Patients with type A aortic dissection were excluded. Thus, 123 patients were analyzed. We identified 47 patients with an preoperative aortic Root Diameter exceeding 60 mm (group A), 58 patients with an Diameter between 50 and 60 mm (group B), and 18 patients with a Diameter less than 50 mm (group C). The groups were compared regarding mortality, long-term survival, freedom from reoperation, freedom from severe and moderate aortic valve insufficiency (AI), and postoperative morbidity. Mean follow-up (group A 43+/-26 months, group B 40+/-25 months, group C 23+/-19 months; group C versus group A, P=0.005; group C versus group B, P=0.011) was shorter in group C. Perioperative mortality (group A 2.2%, group B 1.9%, group C 5.2%; P=ns) was comparable between the groups with each one patient. The 3-year survival for group A was 98+/-2%, for group B 96+/-3%, and for group C 100+/-0% (P=ns). Freedom from reoperation for group A was 98+/-2%, for group B 96+/-3%, and for group C 88+/-8% (P=ns). Four patients developed severe or moderate AI, thus freedom from severe and moderate AI for group A was 100+/-0%, for group B 88+/-8%, and for group C 94+/-5% (P=ns). During follow-up no thromboembolic or bleeding events were noticed. Our data show that the preoperative Diameter of the aortic Root has no impact on the longevity of the repair. Thus, the reimplantation technique can be recommended for all patients presenting with an aortic Root aneurysm and normal leaflets regardless of the aortic Root Diameter.

  • Impact of Preoperative Aortic Root Diameter on Long-Term Aortic Valve Function After Valve Sparing Aortic Root Reimplantation
    Circulation, 2003
    Co-Authors: R G Leyh, K Kallenbach, M Karck, C Hagl, S Fischer, A Haverich
    Abstract:

    Background— Valve sparing aortic Root reimplantation technique in patients with aortic Root aneurysm have shown excellent mid-term results. In conjunction with the Diameter of the aortic Root the mechanical leaflet stress increase, which might have an impact on long-term aortic valve function after valve sparing aortic Root reimplantation. Methods and Results— From July 1993 to October 2001, 168 patients with aortic Root aneurysm underwent valve sparing aortic Root reimplantation. Patients with type A aortic dissection were excluded. Thus, 123 patients were analyzed. We identified 47 patients with an preoperative aortic Root Diameter exceeding 60 mm (group A), 58 patients with an Diameter between 50 and 60 mm (group B), and 18 patients with a Diameter less than 50 mm (group C). The groups were compared regarding mortality, long-term survival, freedom from reoperation, freedom from severe and moderate aortic valve insufficiency (AI), and postoperative morbidity. Mean follow-up (group A 43±26 months, group B 40±25 months, group C 23±19 months; group C versus group A, P =0.005; group C versus group B, P =0.011) was shorter in group C. Perioperative mortality (group A 2.2%, group B 1.9%, group C 5.2%; P =ns) was comparable between the groups with each one patient. The 3-year survival for group A was 98±2%, for group B 96±3%, and for group C 100±0% ( P =ns). Freedom from reoperation for group A was 98±2%, for group B 96±3%, and for group C 88±8% ( P =ns). Four patients developed severe or moderate AI, thus freedom from severe and moderate AI for group A was 100±0%, for group B 88±8%, and for group C 94±5% ( P =ns). During follow-up no thromboembolic or bleeding events were noticed. Conclusions— Our data show that the preoperative Diameter of the aortic Root has no impact on the longevity of the repair. Thus, the reimplantation technique can be recommended for all patients presenting with an aortic Root aneurysm and normal leaflets regardless of the aortic Root Diameter.

Thomas H Mosley - One of the best experts on this subject based on the ideXlab platform.

  • Normal Limits in Relation to Age, Body Size and Gender of Two-Dimensional Echocardiographic Aortic Root Dimensions in Persons ≥15 Years of Age
    The American journal of cardiology, 2012
    Co-Authors: Richard B. Devereux, Donna K. Arnett, Thomas H Mosley, Dalane W Kitzman, Giovanni De Simone, Lyle G. Best, Eric Boerwinkle, Barbara V. Howard, Elisa T. Lee, Alan B. Weder
    Abstract:

    Nomograms to predict normal aortic Root Diameter for body surface area (BSA) in broad ranges of age have been widely used but are limited by lack of consideration of gender effects, jumps in upper limits of aortic Diameter among age strata, and data from older teenagers. Sinus of Valsalva Diameter was measured by American Society of Echocardiography convention in normal-weight, nonhypertensive, nondiabetic subjects ≥15 years old without aortic valve disease from clinical or population-based samples. Analyses of covariance and linear regression with assessment of residuals identified determinants and developed predictive models for normal aortic Root Diameter. In 1,207 apparently normal subjects ≥15 years old (54% women), aortic Root Diameter was 2.1 to 4.3 cm. Aortic Root Diameter was strongly related to BSA and height (r = 0.48 for the 2 comparisons), age (r = 0.36), and male gender (+2.7 mm adjusted for BSA and age, p

  • plasma c terminal pro endothelin 1 is associated with left ventricular mass index and aortic Root Diameter in african american adults with hypertension
    Journal of Human Hypertension, 2011
    Co-Authors: Malik A Alomari, Mahyar Khaleghi, Thomas H Mosley, Nils G Morgenthaler, Joachim Struck, Andreas Bergmann, Iftikhar J Kullo
    Abstract:

    Endothelin-1 (ET-1), a circulating vasoactive peptide with potent vasoconstricting and mitogenic properties, may contribute to target-organ damage in hypertension. We investigated whether plasma levels of C-terminal pro-endothelin-1 (CT-pro-ET-1) are associated with left ventricular (LV) mass and aortic Root Diameter in African-American adults with hypertension. Plasma CT-pro-ET-1 was measured by an immunoluminometric assay in 1041 African Americans (65±9 years, 72% women) with hypertension. LV mass and aortic Root Diameter were measured according to the American Society of Echocardiography guidelines, and LV mass was indexed by height to the power 2.7 (LVMi). Multivariable regression analyses were used to assess whether plasma CT-pro-ET-1 was associated with LVMi and aortic Root Diameter, independent of potential confounding variables. Plasma CT-pro-ET-1 was modestly correlated with LVMi (r=0.21, P<0.0001) and aortic Root Diameter (r=0.09, P=0.004). In separate multivariable regression models that adjusted for age, sex, body mass index, total and high-density lipoprotein cholesterol, smoking history, diabetes, history of myocardial infarction or stroke, and blood pressure-lowering medication and statin use, log CT-pro-ET-1 was significantly associated with greater LVMi (P=0.001) and larger aortic Root Diameter (P=0.006). CT-pro-ET-1 is independently associated with LVMi and aortic Root Diameter and may be a marker of target-organ damage in African-Americans adults with hypertension.

  • Plasma C-terminal pro-endothelin-1 is associated with left ventricular mass index and aortic Root Diameter in African-American adults with hypertension.
    Journal of human hypertension, 2010
    Co-Authors: Malik A. Al-omari, Mahyar Khaleghi, Thomas H Mosley, Nils G Morgenthaler, Joachim Struck, Andreas Bergmann, Iftikhar J Kullo
    Abstract:

    Endothelin-1 (ET-1), a circulating vasoactive peptide with potent vasoconstricting and mitogenic properties, may contribute to target-organ damage in hypertension. We investigated whether plasma levels of C-terminal pro-endothelin-1 (CT-pro-ET-1) are associated with left ventricular (LV) mass and aortic Root Diameter in African-American adults with hypertension. Plasma CT-pro-ET-1 was measured by an immunoluminometric assay in 1041 African Americans (65±9 years, 72% women) with hypertension. LV mass and aortic Root Diameter were measured according to the American Society of Echocardiography guidelines, and LV mass was indexed by height to the power 2.7 (LVMi). Multivariable regression analyses were used to assess whether plasma CT-pro-ET-1 was associated with LVMi and aortic Root Diameter, independent of potential confounding variables. Plasma CT-pro-ET-1 was modestly correlated with LVMi (r=0.21, P

Zhengquan Wang - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Root Diameter, branch order, soil depth and season of birth on fine Root life span in five temperate tree species
    European Journal of Forest Research, 2017
    Co-Authors: Yan Wang, Timothy J. Fahey, Zhengquan Wang
    Abstract:

    Fine Root life span is a key variable influencing the belowground dynamics of forest ecosystems and is known to be associated with a complex suite of endogenous and environmental factors. We investigated how Root life span is influenced by Root Diameter, branch order, season of birth and soil depth of birth for five temperate tree species growing in monoculture plantations at a common site in northeastern China. The minirhizotron approach was used to estimate Root life span from April 2008 to October 2009. Cox proportional hazards regression analysis was employed to determine the impact of those four factors on Root life span of each species. There was no consistent difference in fine Root life span between evergreen conifers and deciduous hardwoods. A bimodal frequency distribution of Root life span was observed for all the species; the majority of Roots born in summer and autumn survived to the following year, while Roots born in spring mostly died in the current growing season. Root life span tended to increase with Root Diameter across all species, except Juglans mandshurica. The first two Root branch orders within each species generally shared similar life span, with the exception of Picea koraiensis. Root life span tended to be longer at greater depths in the soil profile across all five species. Our results suggest that Root life span generally depends on complex interrelations among Root anatomy, soil environment and seasonal climatic conditions.

  • Root Diameter variations explained by anatomy and phylogeny of 50 tropical and temperate tree species
    Tree physiology, 2014
    Co-Authors: Xueyun Dong, Hongfeng Wang, Zhengquan Wang
    Abstract:

    Root Diameter, a critical indicator of Root physiological function, varies greatly among tree species, but the underlying mechanism of this high variability is unclear. Here, we sampled 50 tree species across tropical and temperate zones in China, and measured Root morphological and anatomical traits along the first five branch orders in each species. Our objectives were (i) to reveal the relationships between Root Diameter, cortical thickness and stele Diameter among tree species in tropical and temperate forests, and (ii) to investigate the relationship of both Root morphological and anatomical traits with divergence time during species radiation. The results showed that Root Diameter was strongly affected by cortical thickness but less by stele Diameter in both tropical and temperate species. Changes in cortical thickness explained over 90% of variation in Root Diameter for the first order, and ∼74-87% for the second and third orders. Thicker Roots displayed greater cortical thickness and more cortical cell layers than thinner Roots. Phylogenetic analysis demonstrated that Root Diameter, cortical thickness and number of cortical cell layers significantly correlated with divergence time at the family level, showing similar variation trends in geological time. The results also suggested that trees tend to decrease their Root cortical thickness rather than stele Diameter during species radiation. The close linkage of variations in Root morphology and anatomy to phylogeny as demonstrated by the data from the 50 tree species should provide some insights into the mechanism of Root Diameter variability among tree species.

R G Leyh - One of the best experts on this subject based on the ideXlab platform.

  • Impact of preoperative aortic Root Diameter on long-term aortic valve function after valve sparing aortic Root reimplantation.
    Circulation, 2003
    Co-Authors: R G Leyh, K Kallenbach, M Karck, C Hagl, S Fischer, A Haverich
    Abstract:

    Valve sparing aortic Root reimplantation technique in patients with aortic Root aneurysm have shown excellent mid-term results. In conjunction with the Diameter of the aortic Root the mechanical leaflet stress increase, which might have an impact on long-term aortic valve function after valve sparing aortic Root reimplantation. From July 1993 to October 2001, 168 patients with aortic Root aneurysm underwent valve sparing aortic Root reimplantation. Patients with type A aortic dissection were excluded. Thus, 123 patients were analyzed. We identified 47 patients with an preoperative aortic Root Diameter exceeding 60 mm (group A), 58 patients with an Diameter between 50 and 60 mm (group B), and 18 patients with a Diameter less than 50 mm (group C). The groups were compared regarding mortality, long-term survival, freedom from reoperation, freedom from severe and moderate aortic valve insufficiency (AI), and postoperative morbidity. Mean follow-up (group A 43+/-26 months, group B 40+/-25 months, group C 23+/-19 months; group C versus group A, P=0.005; group C versus group B, P=0.011) was shorter in group C. Perioperative mortality (group A 2.2%, group B 1.9%, group C 5.2%; P=ns) was comparable between the groups with each one patient. The 3-year survival for group A was 98+/-2%, for group B 96+/-3%, and for group C 100+/-0% (P=ns). Freedom from reoperation for group A was 98+/-2%, for group B 96+/-3%, and for group C 88+/-8% (P=ns). Four patients developed severe or moderate AI, thus freedom from severe and moderate AI for group A was 100+/-0%, for group B 88+/-8%, and for group C 94+/-5% (P=ns). During follow-up no thromboembolic or bleeding events were noticed. Our data show that the preoperative Diameter of the aortic Root has no impact on the longevity of the repair. Thus, the reimplantation technique can be recommended for all patients presenting with an aortic Root aneurysm and normal leaflets regardless of the aortic Root Diameter.

  • Impact of Preoperative Aortic Root Diameter on Long-Term Aortic Valve Function After Valve Sparing Aortic Root Reimplantation
    Circulation, 2003
    Co-Authors: R G Leyh, K Kallenbach, M Karck, C Hagl, S Fischer, A Haverich
    Abstract:

    Background— Valve sparing aortic Root reimplantation technique in patients with aortic Root aneurysm have shown excellent mid-term results. In conjunction with the Diameter of the aortic Root the mechanical leaflet stress increase, which might have an impact on long-term aortic valve function after valve sparing aortic Root reimplantation. Methods and Results— From July 1993 to October 2001, 168 patients with aortic Root aneurysm underwent valve sparing aortic Root reimplantation. Patients with type A aortic dissection were excluded. Thus, 123 patients were analyzed. We identified 47 patients with an preoperative aortic Root Diameter exceeding 60 mm (group A), 58 patients with an Diameter between 50 and 60 mm (group B), and 18 patients with a Diameter less than 50 mm (group C). The groups were compared regarding mortality, long-term survival, freedom from reoperation, freedom from severe and moderate aortic valve insufficiency (AI), and postoperative morbidity. Mean follow-up (group A 43±26 months, group B 40±25 months, group C 23±19 months; group C versus group A, P =0.005; group C versus group B, P =0.011) was shorter in group C. Perioperative mortality (group A 2.2%, group B 1.9%, group C 5.2%; P =ns) was comparable between the groups with each one patient. The 3-year survival for group A was 98±2%, for group B 96±3%, and for group C 100±0% ( P =ns). Freedom from reoperation for group A was 98±2%, for group B 96±3%, and for group C 88±8% ( P =ns). Four patients developed severe or moderate AI, thus freedom from severe and moderate AI for group A was 100±0%, for group B 88±8%, and for group C 94±5% ( P =ns). During follow-up no thromboembolic or bleeding events were noticed. Conclusions— Our data show that the preoperative Diameter of the aortic Root has no impact on the longevity of the repair. Thus, the reimplantation technique can be recommended for all patients presenting with an aortic Root aneurysm and normal leaflets regardless of the aortic Root Diameter.