Glomerular hemodynamics and the renin-angiotensin system in patients with type 1 diabetes mellitus.

Abstract:

BACKGROUND:Many studies have reported that blocking the renin-angiotensin-system (RAS) with an angiotensin-converting enzyme (ACE) inhibitor or an angiotensin receptor blocker in the patient with diabetes mellitus leads to an increase in renal plasma flow (RPF), no change in glomerular filtration rate (GFR), and a fall in filtration fraction. This constellation is generally attributed to predominant efferent arteriolar dilation. METHODS:This study examined the renal hemodynamic response to blocking the RAS with both captopril and candesartan on separate days in 31 patients with type 1 diabetes mellitus. RESULTS:There was a wide range of changes in RPF and GFR in response to the two agents, each administered at the top of its dose-response range. The RPF response to the two agents was strongly concordant (r = 0.65; P < 0.001), as was the GFR response (r = 0.81; P < 0.001). Moreover, there was a strong correlation between the RPF response and the change in GFR with each agent (r = 0.83 and 0.66; P < 0.01). A significant rise in RPF was followed by a rise in GFR. The RPF dependency of GFR in the type 1 diabetics suggests strongly that glomerular filtration equilibrium exists in the glomeruli of the diabetic kidney: Simple notions of local control based on afferent:efferent arteriolar resistance ratios are too simplistic. CONCLUSION:Our data suggest that the intrarenal RAS is activated in over 80% of patients with type 1 diabetes mellitus. Abundant evidence suggests that this activation predisposes to diabetic nephropathy.

journal_name

Kidney Int

journal_title

Kidney international

authors

Hollenberg NK,Price DA,Fisher ND,Lansang MC,Perkins B,Gordon MS,Williams GH,Laffel LM

doi

10.1046/j.1523-1755.2003.00701.x

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

172-8

issue

1

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)48856-8

journal_volume

63

pub_type

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