Cardiovascular–Kidney–Metabolic Syndrome: A New Paradigm in Clinical Medicine or Going Back to Basics?

Cardiovascular, renal, and metabolic diseases are pathophysiologically interdependent, posing a significant global health challenge and being associated with a substantial increase in morbidity and mortality. In 2023, the American Heart Association (AHA) defined this complex network of interconnected health conditions as the cardiovascular–kidney–metabolic (CKM) syndrome. This syndrome is based on common pathophysiological mechanisms, including chronic inflammation, oxidative stress, hyperglycemia and insulin resistance, activation of the renin–angiotensin–aldosterone system (RAAS), and neurohormonal dysfunction, which trigger a vicious cycle where the impairment of one organ contributes to the progressive deterioration of the others. An integrated approach to these conditions, rather than treating them as separate entities, supports a holistic management strategy that helps to reduce the burden on public health and improve patients’ quality of life. Existing management focuses on lifestyle modification, glycemic and lipid control, and the use of nephroprotective and cardioprotective therapies. This narrative review aims to synthesize and contextualize existing information on the complex interactions between these systems and on diagnostic approaches, as well as to provide an overview of the available therapeutic options.