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Cardiovascular diseases and cancer are the most common causes of death in Germany. Cancer treatment can lead to significant cardiovascular side effects and thus form a link between the two disease groups. The focus of cardio-oncology is on the best possible prevention, diagnostics and treatment of cardiovascular complications caused by cancer treatment. It is crucial for cardio-oncology to adapt to the continuous development of new forms of oncological treatment with previously unknown cardiovascular side effects. One such new form of treatment is immune checkpoint inhibitor (ICI) therapy, which is regarded as the most important oncological milestone of the last decade due to its excellent oncological efficacy; however, the growing use has revealed a high risk of diverse cardiovascular side effects with high morbidity and mortality, so that cardio-oncological care of affected patients is of particular importance. This review summarizes the current scientific and clinical state of the pathophysiology, incidence, diagnosis and treatment of cardiovascular side effects of ICI therapy., (© 2024. The Author(s), under exclusive licence to Springer Medizin Verlag GmbH, ein Teil von Springer Nature.)