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  • Title: Plasma cGMP level as a marker of the hydration state in renal replacement therapy.
    Author: Lauster F, Heim JM, Drummer C, Fülle HJ, Gerzer R, Schiffl H.
    Journal: Kidney Int Suppl; 1993 Jun; 41():S57-9. PubMed ID: 8391608.
    Abstract:
    We investigated, whether plasma cyclic guanosine 3':5'-monophosphate (cGMP) may be suited as a marker of hyperhydration in hemodialysis (HD) and continuous ambulatory peritoneal dialysis (CAPD). In 81 HD patients the levels of atrial natriuretic peptide (ANP) and cGMP were markedly elevated before HD (ANP: 165 +/- 11.1 pg/ml; cGMP 43.5 +/- 2.2 pmol/ml). Significantly lower values (P < 0.01) were found after HD (ANP: 97 +/- 8.4 pmol/ml; cGMP 19.5 +/- 1.5 pmol/ml). Twenty-three patients had cGMP levels above 20 pmol/ml after HD. Therefore "dry body weight" was reduced in these patients. This resulted in a "normalization" of cGMP values to a postdialytic range below 20 pmol/ml in the majority of patients. All seven patients with persistently high cGMP levels despite weight reduction had left sided heart failure. In 33 CAPD patients ANP was slightly lower than after HD (68 +/- 10.4 pg/ml), and the cGMP level (22.4 +/- 2.3 pmol/ml) was between pre- and postdialytic values in HD. In eight CAPD patients with clinical signs of hypervolemia plasma cGMP, but not ANP, was significantly elevated. We conclude that the plasma cGMP level appears to be a reliable marker for fluid overload in patients on renal replacement therapy with normal heart function.
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