Key result
Aortic knob diameter increases ~0.02 cm per year of age in healthy adults.
Why the study?
The aortic knob diameter varies by age, gender, and ethnicity, and normative measurements in healthy adult Sudanese were lacking to aid cardiovascular assessment.
Cross-Sectional (n=113)
No
May inform age-adjusted radiographic norms in Sudanese adults; leaves open prognostic value and broader applicability.
Background: The aortic knob (AK) is an essential feature on a chest x-ray. It could be the first sign of a cardiovascular problem if there is any deformation or enlargement of the knob. This study aimed to measure the normal AK diameter (AKD) on a posteroanterior chest radiograph in healthy adult Sudanese. Methods and Results: The study was conducted in the Department of Radiology and Imaging in Ribat Hospital (Sudan) between Jun 2019 and Jan 2020. A total of 113 participants of both sexes (45.1% males and 54.9% females) with a normal chest x-ray and no history of diabetes, blood hypertension, cardiovascular disease, or skeletal abnormality were selected. Participants' age fluctuated from 18 to 75 years. The measurements (AK, heart diameter [HD], cardiothoracic ratio [CTR]) were carried out with the measuring tools available on the software of the computed radiography system. The mean AKD was 2.8±0.8 cm (2.94±0.8 cm in males and 2.51±0.77 cm in females, P=0.005)). The mean HD was 9.22±2.8 cm (9.8±3.3 cm in males and 8.7±0.2.1 cm in females, P=0.005). The mean CTR was estimated as 46.6±7.7% with a significant difference between males and females and significantly correlated with HD and BMI (P<0.05). The AKD increased by 0.019 cm with an increase of one year of age (AKD = 0.0199(age)+1.9469), and there was a strong positive correlation between age and AKD (P<0.001). Conclusion: The study found a significant positive correlation between age and AKD. Increased heart sizes increase AKD. The AKD value is greater in males than in females.
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Maisa Mohammed Elzaki (2022) conducted a cross-sectional in Healthy adults (n=113). Age was evaluated on Correlation between age and aortic knob diameter (AKD) (r=0.342, p=<0.001). Aortic knob diameter showed a significant positive correlation with age, increasing by 0.0199 cm for each year of age in healthy Sudanese adults.
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