The Global Burden of Aortic Aneurysm & Dissection Repair: Epidemiology and Statistics

The Global Burden of Aortic Aneurysm & Dissection Repair: Epidemiology and Statistics

**Disclaimer:** This article is intended for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.

I. Introduction

Aortic aneurysm and aortic dissection represent critical cardiovascular conditions with significant global health implications. An **aortic aneurysm** is characterized by a permanent localized dilation of the aorta, typically exceeding 50% of the normal diameter of the adjacent healthy aorta [1]. While often asymptomatic in its early stages, the rupture of an aortic aneurysm can lead to catastrophic and frequently fatal outcomes [1]. **Aortic dissection**, on the other hand, involves a tear in the inner layer of the aorta, allowing blood to surge between the layers, forcing them apart. Both conditions demand urgent medical attention due to their high mortality rates and potential for severe complications [2].

Understanding the global epidemiology of aortic aneurysm and dissection is paramount for developing effective prevention strategies, improving early diagnosis, and optimizing treatment protocols. This comprehensive review aims to synthesize current epidemiological data, highlighting the incidence, prevalence, mortality rates, and key risk factors associated with these life-threatening aortic pathologies. The insights presented herein are crucial for healthcare professionals, policymakers, and patients alike in comprehending the worldwide burden and guiding future interventions.

II. Epidemiology of Aortic Dissection

Aortic dissection remains a highly challenging clinical problem with a reported 5-year survival rate ranging between 55% and 85% in acute cases of type A and type B aortic dissection [2]. The mortality rate can be as high as 1% per hour initially, reaching approximately 50% by the third day if left untreated [2]. Even post-hospital discharge, 31% to 66% of deaths are attributed to complications, particularly in type B dissections [2].

Global Incidence and Prevalence

The annual incidence rate of type A aortic dissection is estimated at roughly 3 per 100,000 individuals [2]. However, precise global estimates are challenging due to pre-hospital deaths and varying autopsy rates worldwide [2]. Regional data provide a clearer picture:

• **Europe:** Incidence rates for type A and type B aortic dissection vary, with reports from Germany at 5.7/100,000 and 5.24/100,000 respectively [2]. Hungary reported 2.9/100,000, while Emilia-Romagna, Italy, showed 4.7/100,000 [2]. The Oxford Vascular Study in the UK estimated an overall incidence of 6/100,000 [2].
• **North America:** Data from Ontario, Canada, indicated a prevalence of 4.6/100,000 for type A and B dissections. In the United States, Medicare beneficiaries showed an overall hospitalization rate of 10/100,000 for both types [2].
• **Asia:** China reported an estimated incidence of 2.8/100,000 for all types of aortic dissection. Japan exhibits a notably higher incidence, with a prevalence of 17.6/100,000 in Miyazak and 10/100,000 in Tokyo, possibly due to more comprehensive investigation and autopsy data [2]. South Korea reported a gradual increase, reaching an overall incidence of 3.76/100,000 [2].
• **Oceania:** Australia estimated the incidence of type A and B aortic dissection at 3.47/100,000. New Zealand reported rates of 2.8/100,000 in Midland, with a higher incidence exceeding 14/100,000 in Waikato, potentially linked to the Maori population [2].
• **Africa and South America:** Adequate data are often scarce. Brazil reported an estimated incidence of 4.9/100,000 for type A and B aortic dissection [2].

III. Epidemiology of Aortic Aneurysm

The global burden of aortic aneurysm is substantial and continues to evolve. A systematic analysis of data from the Global Burden of Disease (GBD) 2021 study provides critical insights into its trends from 1990 to 2021, with projections extending to 2030 [3].

Mortality Rates and Trends

In 2021, aortic aneurysm was responsible for an estimated 153,927 deaths globally, representing a significant 74.2% increase from 88,353 deaths in 1990 [3]. Despite this rise in absolute numbers, the age-standardized death rate (ASDR) decreased by 26.8% during the same period, from 2.54 to 1.86 per 100,000 population [3]. This paradox highlights the impact of global population aging and growth on the overall burden of the disease [3]. Projections indicate that deaths due to aortic aneurysm will further increase to 174,611 by 2030, even as the ASDR is expected to slightly decline to 1.70 per 100,000 [3].

Sex-Based Differences

Male individuals consistently exhibit a higher ASDR for aortic aneurysm, approximately 2.25 times greater than females [3]. In 2021, the male ASDR was 2.57 per 100,000, compared to 1.28 per 100,000 for females [3]. While the number of deaths increased for both sexes between 1990 and 2021, the ASDR decreased more significantly in males [3].

Regional Disparities

The burden of aortic aneurysm varies considerably across different regions and Socio-demographic Index (SDI) levels. The highest ASDR in 2021 was observed in the High-income Asia Pacific region, at 4.38 per 100,000 [3]. Conversely, regions with lower SDI, such as Low-middle SDI and Low SDI countries, showed increasing ASDRs, indicating a shifting global landscape of the disease burden [3].

**Table 1: Global and Regional Aortic Aneurysm Mortality Trends (1990-2021)** [3]

| Location | 1990 Number (95% UI) | 1990 Age-standardized rate (per 100,000) (95% UI) | 2021 Number (95% UI) | 2021 Age-standardized rate (per 100,000) (95% UI) | EAPC (95% CI) | |---|---|---|---|---|---| | Global | 88,353 (83,090 to 93,492) | 2.54 (2.35 to 2.69) | 153,927 (138,413 to 165,739) | 1.86 (1.67 to 2.00) | −1.28 (−1.38 to −1.18) | | Female | 30,795 (27,622 to 34,388) | 1.58 (1.41 to 1.76) | 60,063 (51,303 to 66,298) | 1.28 (1.10 to 1.42) | −0.91 (−1.01 to −0.81) | | Male | 57,557 (53,979 to 62,641) | 3.87 (3.61 to 4.18) | 93,864 (86,610 to 102,153) | 2.57 (2.36 to 2.79) | −1.63 (−1.74 to −1.52) | | High SDI | 53,929 (50,582 to 55,553) | 4.76 (4.46 to 4.91) | 67,202 (57,735 to 72,287) | 2.87 (2.51 to 3.06) | −1.98 (−2.11 to −1.85) | | High-middle SDI | 18,321 (17,508 to 19,197) | 1.99 (1.88 to 2.08) | 34,827 (32,309 to 37,274) | 1.79 (1.66 to 1.92) | −0.66 (−0.82 to −0.51) | | Middle SDI | 8804 (8110 to 9844) | 1.03 (0.94 to 1.14) | 28,528 (25,797 to 30,959) | 1.15 (1.04 to 1.25) | 0.16 (0.04 to 0.28) | | Low-middle SDI | 4608 (3664 to 6272) | 0.89 (0.71 to 1.20) | 16,808 (13,956 to 22,468) | 1.31 (1.09 to 1.76) | 1.27 (1.21 to 1.33) | | Low SDI | 2557 (1568 to 4437) | 1.37 (0.83 to 2.37) | 6371 (3932 to 10,434) | 1.48 (0.91 to 2.44) | 0.19 (−0.02 to 0.41) |

IV. Key Risk Factors

Several factors contribute to the development and progression of aortic aneurysm and dissection. Identifying and managing these risk factors are critical for prevention and improved patient outcomes.

Hypertension

Uncontrolled hypertension is consistently recognized as one of the most significant modifiable risk factors for both aortic aneurysm and dissection [2, 3]. In hypertensive patients, the incidence of aortic dissection can be as high as 0.5% to 1% in those with systolic blood pressure exceeding 180 mmHg or diastolic pressure above 120 mmHg [2]. Studies have shown a positive dose-dependent relationship between blood pressure and aortic dissection risk, even within normal blood pressure ranges [2].

Age

Age is a prominent risk factor, with the incidence of aortic dissection rising sharply in older adult populations. Rates are reported to be 8.6 per 100,000 in individuals aged 60 to 80 years and 32 per 100,000 for those over 80 years [2]. However, some populations, particularly in China, exhibit a younger age of onset, with average ages for aortic dissection patients being approximately 10 years lower than in Western countries [2].

Sex

While males generally have a higher incidence and ASDR for aortic aneurysm and dissection, female sex can be an independent risk factor for aortic dissection, often associated with delayed diagnosis due to atypical symptoms [2, 3]. The loss of female sex hormones may contribute to the impairment of aortic wall elasticity, increasing susceptibility [2].

Genetic Syndromes

Genetic conditions such as Marfan Syndrome (MFS) and Bicuspid Aortic Valve (BAV) significantly increase the risk of aortic aneurysm and dissection. MFS is implicated in 3% to 7% of aortic dissection cases, and BAV is associated with Turner syndrome in 30% of cases [2]. These syndromes often lead to earlier onset and more severe aortic pathologies.

Lifestyle Factors

Several lifestyle factors contribute to the risk:

• **Smoking:** Identified as the leading attributable risk factor for aortic aneurysm, accounting for 30.9% of ASDR [3].
• **High Body Mass Index (BMI):** While not directly associated with the incidence of aortic dissection, high BMI is independently linked to higher in-hospital adverse outcomes [2].
• **Diet:** Diets low in fruits and vegetables, and high in sodium, are recognized attributable risk factors for aortic aneurysm [3].
• **Lead Exposure:** Also listed as an attributable risk factor for aortic aneurysm [3].

V. Socio-demographic and Environmental Influences

Beyond individual risk factors, broader socio-demographic and environmental elements play a role in the global burden of aortic diseases.

Socio-demographic Index (SDI)

The SDI, a composite indicator of socioeconomic development, correlates with the ASDR of aortic aneurysm. While high SDI regions have seen declining ASDRs, middle and low SDI regions are experiencing increasing trends, suggesting that socioeconomic development influences the disease burden and access to healthcare [3].

Seasonal and Meteorological Factors

Seasonal variations, particularly autumn and winter, are associated with an increased incidence of aortic dissection and worsening outcomes [2]. This is attributed to factors like higher blood viscosity, vasoconstriction of small vessels, and increased arterial shear force on the aortic wall due to colder temperatures and temperature fluctuations [2]. Studies have shown a link between lower temperatures and increased aortic dissection risk, with some research suggesting that temperature fluctuation rather than absolute temperature is a stronger predictor [2].

VI. Challenges in Data Collection and Estimation

Accurate global epidemiological data for aortic aneurysm and dissection are challenging to obtain due to several factors:

• **Pre-hospital Deaths:** A significant number of patients with aortic dissection die before reaching a hospital, leading to underestimation of incidence [2].
• **Varying Autopsy Rates:** Differences in autopsy rates across countries affect the detection and reporting of aortic dissection, making cross-country comparisons difficult [2].
• **Data Availability:** Adequate data are often unavailable in certain regions, particularly in African and South American countries, creating gaps in global understanding [2].

VII. Projections and Future Burden

The projected increase in absolute deaths from aortic aneurysm by 2030 underscores the persistent and growing challenge posed by these conditions [3]. The shifting demographic landscape, characterized by an aging global population, will continue to drive the overall burden, even if age-standardized mortality rates decline [3]. This necessitates innovative prevention strategies, particularly targeting modifiable risk factors like smoking and hypertension, and a concerted effort to improve healthcare infrastructure and access to early diagnosis and treatment worldwide.

VIII. Conclusion

Aortic aneurysm and dissection represent a substantial and evolving global health burden. While age-standardized mortality rates for aortic aneurysm have shown a decline, the absolute number of deaths continues to rise, primarily due to demographic shifts. Aortic dissection, with its high acute mortality, also presents a significant challenge. Key risk factors, including hypertension, age, sex, genetic predispositions, and lifestyle choices, play crucial roles in the epidemiology of these diseases. Regional disparities and socio-environmental factors further complicate the picture, highlighting the need for tailored public health interventions.

Addressing this global burden requires a multi-faceted approach. Enhanced public awareness campaigns, targeted screening programs for high-risk individuals, and improved access to advanced diagnostic and therapeutic interventions are essential. Furthermore, continued research into the precise epidemiology, genetic underpinnings, and environmental influences will be vital in refining prevention and treatment strategies. By understanding the intricate web of factors contributing to aortic aneurysm and dissection, the global healthcare community can work towards mitigating their devastating impact and improving patient outcomes worldwide.

IX. References

[1] Institute for Health Metrics and Evaluation. GBD 2021 study data. [2] Yin, J., Liu, F., Wang, J., Yuan, P., Wang, S., & Guo, W. (2022). Aortic dissection: global epidemiology. *Cardiology Plus*, 7(4), 151-161. [3] Zhuo, Y., Zhao, D., Luo, M., Zhou, Z., & Shu, C. (2025). Global, regional, and national burden of aortic aneurysm disease and its attributable risk factor, 1990–2021: a systematic analysis for the global burden of disease study 2021. *Internal and Emergency Medicine*, 20(7), 2089-2101.