RESEARCH NEWS STORY

Chung-Ang University Study Looks at Cardiovascular Risks in COVID-19 Survivors

This novel study compares the associated risks of cardiovascular diseases between COVID-19 survivors and those hospitalized with non-COVID pneumonia

Acute cardiovascular manifestations of COVID-19, such as heart failure, thrombosis, and dysrhythmia, are associated with increased mortality. To address the limitations of prior studies on this topic, researchers from Chung-Ang University examined whether COVID-19 survivors faced higher cardiovascular risks compared to non-COVID pneumonia patients. They analyzed data from Korean hospitals and found no overall increase in cardiovascular issues among COVID-19 survivors.

Image Title: The cumulative incidence of MACE and all- cause of mortality in COVID-19 and non-COVID-19 pneumonia groups.

Image Caption: Researchers analyze primary and secondary cardiovascular outcomes in 132,784 inpatients with COVID-19 (October 8, 2020 to September 30, 2021) and 31,173 inpatients with non-COVID-19 pneumonia (January 1, 2019 to December 31, 2019) in Korea. The results indicate a lower risk of cardiovascular disease in COVID-19 patients.

Image credit: Won-Young Kim from Chung-Ang University

License type: CC BY 4.0 DEED

Usage restriction: Unrestricted use, distribution, and reproduction in any medium permitted, provided the original work is properly cited.

The emergence of COVID-19 pandemic caused as a severe acute respiratory syndrome-coronavirus marked a global health crisis with over 770 million cases of infection and 6 million deaths by September 6, 2023. Around 6.2% of the recovered individuals, however, face lingering symptoms such as fatigue or respiratory problems. Although interstitial pneumonitis and severe acute respiratory distress syndrome are the main effects of COVID-19 on the lungs, the virus also affects other organs, especially the cardiovascular system. Despite this, previous studies assessing cardiovascular outcomes in post-acute COVID-19 patients were limited by insufficiently adjusting for preexisting cardiovascular conditions among hospitalized individuals. 

To overcome this limitation, a team of scientists led by Dr. Won-Young Kim, along with Professor Sun?Young Jung from Chung-Ang University, Korea, conducted a nationwide population-based cohort study. They aimed to explore the risk of cardiovascular outcomes among individuals who survived acute COVID-19 hospitalization without preexisting cardiovascular conditions. The results of their study was published online on 20 October, 2023, in BMC Medicine. 

The researchers used hospitalized patients with non-COVID-19 pneumonia as a historical comparison control group. Explaining the rationale for this study design further, Dr. Kim says, “Previous studies that assessed the risk of cardiovascular outcomes after COVID-19 selected general hospital admission as controls, neglecting the potential cardiovascular risks following non-COVID-19 pneumonia hospitalization. In addition, the demographic composition of previous studies (based on mostly White and older male populations) may limit the generalizability of the results.” 

The study utilized the Korean National Health Insurance Service database, encompassing nearly 97% of Korea's population. The database offered comprehensive details on demographics, diagnoses, treatments, and outcomes, linked to confirmed cases and vaccination information. The research focused on two groups—the first comprised 132,784 adults hospitalized for COVID-19 between October 2020 and September 2021, while the second consisted of a historical control group of 31,173 adults hospitalized for non-COVID pneumonia between January and December 2019. 

The primary outcome measured was major adverse cardiovascular events, with secondary outcomes encompassing specific cardiovascular conditions and mortality. Various other subgroup and sensitivity analyses were conducted along with statistical analyses.

Interestingly, the researchers found no increased incidence of post-acute cardiovascular issues in those adults hospitalized with COVID-19 compared to those hospitalized for non-COVID-19 pneumonia. COVID-19 survivors exhibited lower risks of all-cause mortality, congestive heart failure, and cardiac arrest, but faced notably higher risks of acute myocarditis and deep vein thrombosis. Further, younger COVID-19 patients, especially those without cardiovascular risk factors, showed elevated risks of cardiovascular complications, implying that COVID-19 may be an independent risk factor in this subgroup. Sensitivity analyses with preexisting cardiovascular disease and subgroup assessments confirmed these trends, emphasizing the impact of COVID-19 on cardiovascular outcomes. Additionally, non-vaccinated COVID-19 patients exhibited increased risks of various adverse cardiovascular events. 

Discussing the results further, Dr. Kim remarks, "Our results suggest that COVID-19 vaccination may prevent cardiovascular outcomes. This supports vaccination, especially for patients with preexisting cardiovascular disease." 

This study is the first to compare the risk of cardiovascular outcomes between COVID-19 and non-COVID-19 pneumonia among the East Asian population. While prior Western studies suggested elevated cardiovascular risks post-COVID-19, this research has revealed low risks in Korean patients following acute COVID-19 hospitalizations. Going ahead, these findings can offer valuable insights for healthcare practitioners and policymakers to devise effective strategies for the long-term care of COVID-19 patients.

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About Chung-Ang University

Chung-Ang University is a private comprehensive research university located in Seoul, South Korea. It was started as a kindergarten in 1916 and attained university status in 1953. It is fully accredited by the Ministry of Education of Korea. Chung-Ang University conducts research activities under the slogan of “Justice and Truth.” Its new vision for completing 100 years is “The Global Creative Leader.” Chung-Ang University offers undergraduate, postgraduate, and doctoral programs, which encompass a law school, management program, and medical school; it has 16 undergraduate and graduate schools each. Chung-Ang University’s culture and arts programs are considered the best in Korea.

About Professor Won-Young Kim 

Won-Young Kim is an Associate Professor of Division of Pulmonary and Critical Care Medicine at Chung-Ang University Hospital. His research focuses on the inflammatory disorders such as sepsis and acute respiratory distress syndrome. He has served as a principal investigator on several funded projects related to vitamin C for septic shock. He is also interested in epidemiology of COVID-19. 

Read more: https://scholarworks.bwise.kr/cau/researcher-profile?ep=1222

About Associate Professor Sun-Young Jung 

Sun-Young Jung is an Associate Professor of College of Pharmacy and Department of Global Innovative Drugs at Chung-Ang University. Her research is focused on clinical and pharmacoepidemiology for assessing the real-world effectiveness and safety of healthcare interventions, particularly in autoimmune, respiratory, and infectious diseases.

Read more: https://scholarworks.bwise.kr/cau/researcher-profile?ep=964