Individual, expected diameters of the ascending aorta and prevalence of dilations in a study-population aged 60-74 years: a DANCAVAS substudy.
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.
['Obel|Lasse M|LM|http://orcid.org/0000-0003-0037-8962', 'Lindholt|Jes S|JS|', 'Leetmaa|Tina H|TH|', 'Dahl|Jordi S|JS|', 'Møller|Jacob E|JE|', 'Steffensen|Flemming H|FH|', 'Frost|Lars|L|', 'Lambrechtsen|Jess|J|', 'Busk|Martin|M|', 'Urbonaviciene|Grazina|G|', 'Egstrup|Kenneth|K|', 'Karon|Marek|M|', 'Gerke|Oke|O|', 'Diederichsen|Axel C P|ACP|']
D000367:Age Factors D000368:Aged D001011:Aorta D001014:Aortic Aneurysm D001027:Aortography D001830:Body Surface Area D000072226:Computed Tomography Angiography D003430:Cross-Sectional Studies D003718:Denmark D004108:Dilatation, Pathologic D004452:Echocardiography D005260:Female D006801:Humans D008297:Male D008875:Middle Aged D011237:Predictive Value of Tests D015995:Prevalence D011446:Prospective Studies D012016:Reference Values D012737:Sex Factors
Prevalence Ascending aortic dilation Ascending aortic size General population