Summary
Because of inappropriate signals from the volume-regulation system and a reduction in renal blood flow, the kidney is not able to prevent sodium and water retention in chronic congestive heart failure (CHF).
A brief summary of normal renal function and renal involvement in CHF is given and a study of renal function in patients with moderate or severe chronic CHF is presented. To evaluate the impact of cardiac output reduction on the regulation of the glomerular filtration rate (GFR) in heart failure, GFR (inulin clearance), renal plasma flow [p-aminohippurate (PAH) clearance], invasive haemodynamics, blood volume, plasma renin and plasma catecholamines were measured in 34 patients with chronic CHF.
The patients were divided into 3 groups according to their cardiac index (CI): CI > 2.0 L/min/m2 (group A), CI 1.5 to 2.0 L/min/m2 (group B), and CI < 1.5 L/min/m2 (group C). Differences in the relationship between GFR, renal plasma flow and filtration fraction for the 3 groups emerged. Despite an intergroup reduction in the renal fraction of cardiac output and renal blood flow, GFR was similar in groups A and B (62 and 67 ml/min/1.73 m2, respectively), and was accompanied by a compensatory increase in filtration fraction, from 24% in group A to 35% in group B. Group C had a much lower GFR (38 ml/min/1.73 m2), however, the filtration fraction (28%) was intermediate in value between those of groups A and B. The differences in GFR were reflected by blood urea nitrogen levels but not by serum creatinine levels. The occurrence of a non-compensatory filtration fraction response in the patients with the greatest impairment of CI and renal blood flow suggests that GFR becomes dependent on afferent arteriolar flow in the most severe heart failure, despite stimulation of haemodynamic and hormonal pathways, which would normally increase efferent arteriolar tone. It is thus suggested that GFR becomes flow dependent in patients in the most severe stage of chronic CHF.
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Ljungman, S., Laragh, J.H. & Cody, R.J. Role of the Kidney in Congestive Heart Failure. Drugs 39 (Suppl 4), 10–21 (1990). https://doi.org/10.2165/00003495-199000394-00004
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DOI: https://doi.org/10.2165/00003495-199000394-00004