Clustering Analysis of Long-Term Cardiovascular Complications in COVID-19 Patients
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Abstract
This study employs K-means clustering to analyze long-term cardiovascular complications in COVID-19 patients through ECG parameters, demographics, comorbidities, and hospitalization data. Three distinct clusters emerged: Cluster 0 (moderate heart rate variability/ICU admissions), Cluster 1 (lower variability/admissions), and Cluster 2 (higher variability/admissions, indicating elevated risk). Bootstrap validation confirmed model robustness, supported by high silhouette scores and consistent cluster labels. The novel integration of multimodal data with machine learning revealed hidden cardiovascular outcome patterns, demonstrating clinical utility for risk stratification. Findings underscore the value of clustering techniques in personalizing post-COVID care and optimizing resource allocation for high-risk survivors.
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Data Availability Statement
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Conflicts of Interest
Ethical Approval and Consent to Participate
References
- Sadegh-Zadeh, S. A., Bahrami, M., Najafi, A., Asgari-Ahi, M., Campion, R., & Hajiyavand, A. M. (2022). Evaluation of COVID-19 pandemic on components of social and mental health using machine learning, analysing United States data in 2020. Frontiers in Psychiatry, 13, 933439.
[CrossRef] [Google Scholar] - Long, B., Brady, W. J., Koyfman, A., & Gottlieb, M. (2020). Cardiovascular complications in COVID-19. The American journal of emergency medicine, 38(7), 1504-1507.
[CrossRef] [Google Scholar] - Bansal, M. (2020). Cardiovascular disease and COVID-19. Diabetes & Metabolic Syndrome: Clinical Research & Reviews, 14(3), 247–250.
[CrossRef] [Google Scholar] - Clerkin, K. J., Fried, J. A., Raikhelkar, J., Sayer, G., Griffin, J. M., Masoumi, A., ... & Uriel, N. (2020). COVID-19 and cardiovascular disease. Circulation, 141(20), 1648-1655.
[CrossRef] [Google Scholar] - Franczuk, P., Tkaczyszyn, M., Kulak, M., Domenico, E., Ponikowski, P., & Jankowska, E. A. (2022). Cardiovascular complications of viral respiratory infections and COVID-19. Biomedicines, 11(1), 71.
[CrossRef] [Google Scholar] - Kole, C., Stefanou, E., Karvelas, N., Schizas, D., & Toutouzas, K. P. (2024). Acute and post-acute COVID-19 cardiovascular complications: a comprehensive review. Cardiovascular drugs and therapy, 38(5), 1017-1032.
[CrossRef] [Google Scholar] - Zijlmans, M., Flanagan, D., & Gotman, J. (2002). Heart rate changes and ECG abnormalities during epileptic seizures: prevalence and definition of an objective clinical sign. Epilepsia, 43(8), 847-854.
[CrossRef] [Google Scholar] - Nathala, P., Salunkhe, V., Samanapally, H., Xu, Q., Furmanek, S., Fahmy, O. H., ... & Huang, J. (2022). Electrocardiographic features and outcome: correlations in 124 hospitalized patients with COVID-19 and cardiovascular events. Journal of cardiothoracic and vascular anesthesia, 36(8), 2927-2934.
[CrossRef] [Google Scholar] - Auer, R., Bauer, D. C., Marques-Vidal, P., Butler, J., Min, L. J., Cornuz, J., ... & Rodondi, N. (2012). Association of major and minor ECG abnormalities with coronary heart disease events. Jama, 307(14), 1497-1505.
[CrossRef] [Google Scholar] - Bhat, R. A., Maqbool, S., Rathi, A., Ali, S. M., Hussenbocus, Y. A. A. M., Wentao, X., ... & Gao, C. (2022). The effects of the SARS-CoV-2 virus on the cardiovascular system and coagulation state leading to cardiovascular diseases: a narrative review. INQUIRY: The Journal of Health Care Organization, Provision, and Financing, 59, 00469580221093442.
[CrossRef] [Google Scholar] - Gupta, A., Madhavan, M. V., Sehgal, K., Nair, N., Mahajan, S., Sehrawat, T. S., ... & Landry, D. W. (2020). Extrapulmonary manifestations of COVID-19. Nature medicine, 26(7), 1017-1032.
[CrossRef] [Google Scholar] - Libby, P., & Lüscher, T. (2020). COVID-19 is, in the end, an endothelial disease. European Heart Journal, 41(32), 3038–3044.
[CrossRef] [Google Scholar] - Lala, A., Johnson, K. W., Januzzi, J. L., Russak, A. J., Paranjpe, I., Richter, F., ... & Mount Sinai COVID Informatics Center. (2020). Prevalence and impact of myocardial injury in patients hospitalized with COVID-19 infection. Journal of the American college of cardiology, 76(5), 533-546.
[CrossRef] [Google Scholar] - Shi, S., Qin, M., Shen, B., Cai, Y., Liu, T., Yang, F., ... & Huang, C. (2020). Association of cardiac injury with mortality in hospitalized patients with COVID-19 in Wuhan, China. JAMA Cardiology, 5(7), 802–810.
[CrossRef] [Google Scholar] - Deng, P., Ke, Z., Ying, B., Qiao, B., & Yuan, L. (2020). The diagnostic and prognostic role of myocardial injury biomarkers in hospitalized patients with COVID-19. Clinica Chimica Acta, 510, 186-190.
[CrossRef] [Google Scholar] - Wichmann, D., Sperhake, J. P., Lütgehetmann, M., Steurer, S., Edler, C., Heinemann, A., ... & Kluge, S. (2020). Autopsy findings and venous thromboembolism in patients with COVID-19: a prospective cohort study. Annals of internal medicine, 173(4), 268-277.
[CrossRef] [Google Scholar] - Huang, L., Zhao, P., Tang, D., Zhu, T., Han, R., Zhan, C., ... & Wei, Y. (2020). Cardiac involvement in patients recovered from COVID-2019 identified using magnetic resonance imaging. JACC: Cardiovascular Imaging, 13(11), 2330–2339.
[CrossRef] [Google Scholar] - Puntmann, V. O., Carerj, M. L., Wieters, I., Fahim, M., Arendt, C., Hoffmann, J., ... & Nagel, E. (2020). Outcomes of cardiovascular magnetic resonance imaging in patients recently recovered from coronavirus disease 2019 (COVID-19). JAMA Cardiology, 5(11), 1265–1273.
[CrossRef] [Google Scholar] - Jain, A. K., Murty, M. N., & Flynn, P. J. (1999). Data clustering: a review. ACM computing surveys (CSUR), 31(3), 264-323.
[CrossRef] [Google Scholar] - Xu, D., & Tian, Y. (2015). A comprehensive survey of clustering algorithms. Annals of data science, 2(2), 165-193.
[CrossRef] [Google Scholar] - Zimmerman, A., & Kalra, D. (2020). Usefulness of machine learning in COVID-19 for the detection and prognosis of cardiovascular complications. Reviews in Cardiovascular Medicine, 21(3), 345-352.
[CrossRef] [Google Scholar] - Nezamabadi, K., Sardaripour, N., Haghi, B., & Forouzanfar, M. (2022). Unsupervised ECG analysis: A review. IEEE Reviews in Biomedical Engineering, 16, 208-224.
[CrossRef] [Google Scholar] - Chattopadhyay, S., & Chattopadhyay, A. K. (2025). Identifying Heart Attack Risk in Vulnerable Population: A Machine Learning Approach. Information, 16(4), 265.
[CrossRef] [Google Scholar] - Fernández-de-Las-Peñas, C., Martín-Guerrero, J. D., Florencio, L. L., Navarro-Pardo, E., Rodríguez-Jiménez, J., Torres-Macho, J., & Pellicer-Valero, O. J. (2023). Clustering analysis reveals different profiles associating long-term post-COVID symptoms, COVID-19 symptoms at hospital admission and previous medical co-morbidities in previously hospitalized COVID-19 survivors. Infection, 51(1), 61-69.
[CrossRef] [Google Scholar] - Lloyd, S. (1982). Least squares quantization in PCM. IEEE Transactions on Information Theory, 28(2), 129–137.
[CrossRef] [Google Scholar] - Vadyala, S. R., Betgeri, S. N., Sherer, E. A., & Amritphale, A. (2021). Prediction of the number of COVID-19 confirmed cases based on K-means-LSTM. Array, 11, 100085.
[CrossRef] [Google Scholar] - Nouraei, H., Nouraei, H., & Rabkin, S. W. (2022). Comparison of unsupervised machine learning approaches for cluster analysis to define subgroups of heart failure with preserved ejection fraction with different outcomes. Bioengineering, 9(4), 175.
[CrossRef] [Google Scholar] - Murtagh, F., & Contreras, P. (2012). Algorithms for hierarchical clustering: an overview. Wiley Interdisciplinary Reviews: Data Mining and Knowledge Discovery, 2(1), 86–97.
[CrossRef] [Google Scholar] - Gaete Villegas, J. A. (2024). Modelling and predicting medical outcomes for intensive care patients via network mechanisms and machine learning. http://dx.doi.org/10.7488/era/4929
[Google Scholar] - Gayathri, Y. K. K. M. K., & Napagoda, N. A. D. N. (2025). Evaluating Clustering Methods for Heart Disease Analysis.
[Google Scholar] - Ester, M., Kriegel, H. P., Sander, J., & Xu, X. (1996). A density-based algorithm for discovering clusters in large spatial databases with noise. In Proceedings of the Second International Conference on Knowledge Discovery and Data Mining (pp. 226–231). AAAI Press.
[Google Scholar] - Mardani, K., Maghooli, K., & Farokhi, F. (2025). Segmentation of coronary arteries from X-ray angiographic images using density based spatial clustering of applications with noise (DBSCAN). Biomedical Signal Processing and Control, 101, 107175.
[CrossRef] [Google Scholar] - Kaverinskiy, V., Chaikovsky, I., Mnevets, A., Ryzhenko, T., Bocharov, M., & Malakhov, K. (2025). Scalable Clustering of Complex ECG Health Data: Big Data Clustering Analysis with UMAP and HDBSCAN. Computation, 13(6), 144.
[CrossRef] [Google Scholar] - Rios, R., Miller, R. J., Manral, N., Sharir, T., Einstein, A. J., Fish, M. B., ... & Slomka, P. J. (2022). Handling missing values in machine learning to predict patient-specific risk of adverse cardiac events: Insights from REFINE SPECT registry. Computers in biology and medicine, 145, 105449.
[CrossRef] [Google Scholar] - Kukkala, V. R., Praveen, S. P., Tirumanadham, N. S. K. M. K., & Srinivasu, P. N. (2024). A Study on Outlier Detection and Feature Engineering Strategies in Machine Learning for Heart Disease Prediction. Computer Systems Science & Engineering, 48(5).
[CrossRef] [Google Scholar] - Althouse, A. D., Below, J. E., Claggett, B. L., Cox, N. J., De Lemos, J. A., Deo, R. C., ... & American Heart Association Scientific Publishing Committee Statistics Task Force. (2021). Recommendations for statistical reporting in cardiovascular medicine: a special report from the American Heart Association. Circulation, 144(4), e70-e91.
[CrossRef] [Google Scholar] - Karampatzakis, S. (2024). A machine learning approach into classification of heart sounds of COVID-19 ICU patients.
[Google Scholar] - Hossain, M., Devnath, A., & Karmokar, P. (2023). Handling Missing Values and Outliers in Advanced Data Pre-processing: An Enhancement of Diabetes Classification Accuracy.
[CrossRef] [Google Scholar] - Maslove, D. M., Dubin, J. A., Shrivats, A., & Lee, J. (2016). Errors, omissions, and outliers in hourly vital signs measurements in intensive care. Critical care medicine, 44(11), e1021-e1030.
[CrossRef] [Google Scholar] - Proudlove, N. C., Goff, M., Walshe, K., & Boaden, R. (2019). The signal in the noise: Robust detection of performance “outliers” in health services. Journal of the Operational Research Society, 70(7), 1102-1114.
[CrossRef] [Google Scholar] - Mello-Román, J. D., & Martínez-Amarilla, A. (2025). COVID-19 Data Analysis: The Impact of Missing Data Imputation on Supervised Learning Model Performance. Computation, 13(3), 70.
[CrossRef] [Google Scholar] - RM, S. P., Maddikunta, P. K. R., Koppu, S., Gadekallu, T. R., Chowdhary, C. L., & Alazab, M. (2020). An effective feature engineering for DNN using hybrid PCA-GWO for intrusion detection in IoMT architecture. Computer Communications, 160, 139-149.
[CrossRef] [Google Scholar] - Herdian, C., Widianto, S., Ginting, J. A., Geasela, Y. M., & Sutrisno, J. (2024). The Use of Feature Engineering and Hyperparameter Tuning for Machine Learning Accuracy Optimization: A Case Study on Heart Disease Prediction. In Engineering Applications of Artificial Intelligence (pp. 193-218). Cham: Springer Nature Switzerland.
[CrossRef] [Google Scholar] - Hu, H., Liu, J., Zhang, X., & Fang, M. (2023). An effective and adaptable K-means algorithm for big data cluster analysis. Pattern Recognition, 139, 109404.
[CrossRef] [Google Scholar] - Ikotun, A. M., Ezugwu, A. E., Abualigah, L., Abuhaija, B., & Heming, J. (2023). K-means clustering algorithms: A comprehensive review, variants analysis, and advances in the era of big data. Information Sciences, 622, 178-210.
[CrossRef] [Google Scholar] - Argiento, R., Cremaschi, A., & Guglielmi, A. (2014). A “density-based” algorithm for cluster analysis using species sampling Gaussian mixture models. Journal of Computational and Graphical Statistics, 23(4), 1126-1142.
[CrossRef] [Google Scholar] - Huang, Z., Zheng, H., Li, C., & Che, C. (2024). Application of machine learning-based k-means clustering for financial fraud detection. Academic Journal of Science and Technology, 10(1), 33-39.
[Google Scholar] - Tolnai, B. A., Ma, Z., & Jørgensen, B. N. (2023, September). A scoping review of energy load disaggregation. In EPIA Conference on Artificial Intelligence (pp. 209-221). Cham: Springer Nature Switzerland.
[CrossRef] [Google Scholar] - Bouvier, F., Chaimani, A., Peyrot, E., Gueyffier, F., Grenet, G., & Porcher, R. (2024). Estimating individualized treatment effects using an individual participant data meta-analysis. BMC Medical Research Methodology, 24(1), 74.
[CrossRef] [Google Scholar] - Rekkas, A., Rijnbeek, P. R., Kent, D. M., Steyerberg, E. W., & van Klaveren, D. (2023). Estimating individualized treatment effects from randomized controlled trials: a simulation study to compare risk-based approaches. BMC Medical Research Methodology, 23(1), 74.
[CrossRef] [Google Scholar] - Huang, X., Liu, L., Eli, B., Wang, J., Chen, Y., & Liu, Z. (2022). Mental health of COVID-19 survivors at 6 and 12 months postdiagnosis: a cohort study. Frontiers in Psychiatry, 13, 863698.
[CrossRef] [Google Scholar]
Cite This Article
TY - JOUR AU - Sadegh-Zadeh, Seyed-Ali AU - Mamalo, Alireza Soleimani AU - Saadat, Shayan AU - Behnemoon, Mahsa AU - Ojarudi, Masoud AU - Gharebaghi, Naser AU - Pashaei, Mohammad Reza AU - Hajizadeh, Reza PY - 2025 DA - 2025/05/16 TI - Clustering Analysis of Long-Term Cardiovascular Complications in COVID-19 Patients JO - Frontiers in Biomedical Signal Processing T2 - Frontiers in Biomedical Signal Processing JF - Frontiers in Biomedical Signal Processing VL - 1 IS - 1 SP - 1 EP - 23 DO - 10.62762/FBSP.2025.731159 UR - https://www.icck.org/article/abs/FBSP.2025.731159 KW - COVID-19 KW - cardiovascular complications KW - clustering analysis KW - K-means KW - ECG parameters AB - This study employs K-means clustering to analyze long-term cardiovascular complications in COVID-19 patients through ECG parameters, demographics, comorbidities, and hospitalization data. Three distinct clusters emerged: Cluster 0 (moderate heart rate variability/ICU admissions), Cluster 1 (lower variability/admissions), and Cluster 2 (higher variability/admissions, indicating elevated risk). Bootstrap validation confirmed model robustness, supported by high silhouette scores and consistent cluster labels. The novel integration of multimodal data with machine learning revealed hidden cardiovascular outcome patterns, demonstrating clinical utility for risk stratification. Findings underscore the value of clustering techniques in personalizing post-COVID care and optimizing resource allocation for high-risk survivors. SN - 3071-2912 PB - Institute of Central Computation and Knowledge LA - English ER -
@article{SadeghZadeh2025Clustering,
author = {Seyed-Ali Sadegh-Zadeh and Alireza Soleimani Mamalo and Shayan Saadat and Mahsa Behnemoon and Masoud Ojarudi and Naser Gharebaghi and Mohammad Reza Pashaei and Reza Hajizadeh},
title = {Clustering Analysis of Long-Term Cardiovascular Complications in COVID-19 Patients},
journal = {Frontiers in Biomedical Signal Processing},
year = {2025},
volume = {1},
number = {1},
pages = {1-23},
doi = {10.62762/FBSP.2025.731159},
url = {https://www.icck.org/article/abs/FBSP.2025.731159},
abstract = {This study employs K-means clustering to analyze long-term cardiovascular complications in COVID-19 patients through ECG parameters, demographics, comorbidities, and hospitalization data. Three distinct clusters emerged: Cluster 0 (moderate heart rate variability/ICU admissions), Cluster 1 (lower variability/admissions), and Cluster 2 (higher variability/admissions, indicating elevated risk). Bootstrap validation confirmed model robustness, supported by high silhouette scores and consistent cluster labels. The novel integration of multimodal data with machine learning revealed hidden cardiovascular outcome patterns, demonstrating clinical utility for risk stratification. Findings underscore the value of clustering techniques in personalizing post-COVID care and optimizing resource allocation for high-risk survivors.},
keywords = {COVID-19, cardiovascular complications, clustering analysis, K-means, ECG parameters},
issn = {3071-2912},
publisher = {Institute of Central Computation and Knowledge}
}
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