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The term cardiorenal syndrome (CRS) has been used to define interactions between acute or chronic dysfunction of the heart or kidney. When primary chronic kidney disease contribute to cardiac dysfunction, it is classified as type 4 CRS. Cardiac dilatation, valve regurgitations, and left ventricular dysfunction are observed in end-stage renal failure patients with uremic cardiomyopathy. Because of perioperative risks in these patients, they may not be considered a candidate for kidney transplantation. However, uremic cardiomyopathy can be corrected when volume control is achieved by appropriate dose and duration of ultrafiltration. By presenting two cases with occult hypervolemia in uremic cardiomyopathy whose cardiac functions improved early after kidney transplantation, attention is drawn to the importance of kidney transplantation on cardiac function in such patients primarily and the importance of strict volume control on cardiac function in dialysis patients waiting for kidney transplantation.