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The cardiorenal syndrome is a clinical and pathophysiological concept illustrating the relationship between the two organs, and is mainly based on the control of volemia. Heart failure is an example of this entity: when congestive heart failure becomes refractory, ultrafiltration by various modes of dialysis is needed. Ambulatory peritoneal ultrafiltration is a good alternative for the management of treatment-resistant congestive heart failure. Erythropoietin is the main treatment of anaemia of chronic renal failure for dialysed and predialysed patients, or patients with congestive heart failure and renal insufficiency. Correction of anaemia needs to be controlled at a maximal haemoglobin level of 12 g/dl.

Primary hyperparathyroidism is a not so infrequent disease that is often overlooked by physicians. Its incidence is estimated to be about 28 in 100.000 subjects, mainly women over seventy years old. Three to four percents of women over seventy are affected. Hyperparathyroidism can be isolated or be a component of a more complex syndrome like multiple endocrine neoplasms (MEN). Patients can be asymptomatic or present with symptoms like asthenia, hypertension or nephrolithiasis. The biological investigation requires the combined measurements of plasmatic ionized calcium and parathormone. In some cases, more specific explorations like calcium loading tests have to be performed in order to confirm the diagnosis.