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Individual, expected diameters of the ascending aorta and prevalence of dilations in a study-population aged 60–74 years: a DANCAVAS substudy

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Abstract

To determine individual, expected normal diameters of the ascending aorta (AAo) and prevalence of dilations based upon an absolute cut-off point (≥ 40 mm) and individual cut-off point (≥ 25% than expected normal). Non-contrast computed tomography (CT) scans were obtained in 14,993 individuals (95.0% male, mean age 67.8 ± 3.8). A sub-group (n = 291) had AAo diameter measured by transthoracic echocardiography. A prediction formula for AAo diameters was created from multivariate linear regression analysis based upon gender, age, and body surface area. An index was made by dividing observed diameters with predicted diameters. A size-index ≥ 1.25 was defined as dilated. Prevalence of AAo dilations among males and females using 40 mm as cut-off point were 10.6% and 2.1% (p < 0.001), respectively, while 3.3% and 2.6% (p = 0.305) using the size-index ≥ 1.25, respectively. Proportion of agreement between cases of AAo dilations from the size-index and 40 mm was 93.0%. Using the size-index as ‘golden standard’ for dilation, the sensitivity and specificity using 40 mm as cut-off point for males were 100.0% and 92.4%, respectively, while 75.0% and 99.9%, respectively, for females. For males and females, the positive predicted values were 31.3% and 93.8%, respectively; the negative predicted values were 100.0% and 99.3%, respectively. An absolute echocardiographic size-criterion of 40 mm entails a significant number of females with missed AAo dilation, and a large number of males are mistaken to have dilated AAo. Thus, AAo diameters should be evaluated in relation to gender, age and BSA. This study provides a formula for potential clinical implementation.

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Abbreviations

AAo:

Ascending aorta

CT:

Computed tomography

TTE:

Transthoracic echocardiography

BSA:

Body surface area

BMI:

Body mass index

BSA(d):

BSA calculated with Du Bois’ formula

BSA(m):

BSA calculated with Mosteller’s equation

ECG:

Electrocardiography-gated

DANCAVAS I + II:

The Danish Cardiovascular Multicenter Study I + II

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Funding

This study was supported by The Region of Southern Denmark, Elitary Research Center of Individualized Medicine in Arterial Diseases (CIMA), Danish Council for Independent Research, The Danish Heart Foundation, Odense University Hospital and The Helse Foundation.

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Correspondence to Lasse M. Obel.

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Appendix: Baseline characteristics stratified by the population not having TTE performed and the study population undergoing TTE

Appendix: Baseline characteristics stratified by the population not having TTE performed and the study population undergoing TTE

 

Study population not undergoing TTE

Males undergoing TTE

P values

Number (N)

14,702

291

 

Male gender

14,237 (94.9%)

291 (100.0%)

 < 0.01

Age (yrs)

67.8 (± 3.8)

68.5 (± 2.6)

 < 0.01

BMI (kg/m2)

28.0 (± 4.4)

28.4 (± 4.0)

0.19

BSA (m2)

2.04 (± 0.2)

2.07 (± 0.2)

 < 0.01

Smoking

  

0.58

 Current

2,337 (16.0%)

51 (17.7%)

 

 Former

7,320 (50.0%)

147 (50.9%)

 

 Never

4,986 (34.1%)

91 (31.5%)

 

Known hypertension

6,455 (43.9%)

125 (43.0%)

0.79

Known diabetes

1,613 (11.0%)

29 (10.0%)

0.60

Statin treatment

4,862 (33.1%)

100 (34.4%)

0.61

Prior cardiovascular disease

   

 AMI

849 (5.8%)

18 (6.2%)

0.76

 Stroke

943 (6.4%)

15 (5.2%)

0.39

  1. Numbers are mean (± SD) or number of patients (% proportion)
  2. BMI body mass index, BSA body surface area, AMI acute myocardial infarction

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Obel, L.M., Lindholt, J.S., Leetmaa, T.H. et al. Individual, expected diameters of the ascending aorta and prevalence of dilations in a study-population aged 60–74 years: a DANCAVAS substudy. Int J Cardiovasc Imaging 37, 971–980 (2021). https://doi.org/10.1007/s10554-020-02081-3

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  • DOI: https://doi.org/10.1007/s10554-020-02081-3

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