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Pathophysiology of CRS‐4. Interaction between heart and kidney in cardiorenal syndrome type 4. Ca, calcium; EPO, erythropoietin; LVH, left ventricular hypertrophy; PBUTs, protein‐bound uremic toxins; Phos, phosphorus; RAAS, renin‐angiotensin‐aldosterone system; SNS, sympathetic nervous system
