Increased endothelin-1 production in patients with chronic heart failure.
Endothelin-1 (ET-1) concentrations are elevated in patients with congestive heart failure (CHF), although the cause of this increase remains uncertain. We hypothesized that abnormalities in ET-1 production, clearance, or a combination of these may be the cause of elevated ET-1 concentrations in chronic CHF. The kinetics of clearance of ET-1 were measured with (125)I-labeled ET-1 in eight patients with CHF and five age-matched normal individuals. In both normal subjects and the CHF group, the kinetics of ET-1 clearance were best described by a three-compartment model. The steady-state volume of distribution of ET-1 was significantly greater in the CHF group compared with normal subjects (25.2 +/- 3.9 vs. 13.8 +/- 2.1 l/kg; P < 0.05). The total clearance rate from plasma was greater in the CHF group (0.119 +/- 0.018 vs. 0.047 +/- 0.013 l.kg(-1).min(-1); P = 0.05). The total body production rate of ET-1 was also significantly higher in patients with CHF (0.21 +/- 0.03. vs. 0.06 +/- 0.02 ng.kg(-1).min(-1); P < 0.05). It appears that increased ET-1 production rather than decreased clearance is the cause of elevated ET-1 concentrations in patients with chronic CHF.
Parker
John D
JD
Division of Cardiology, Dept. of Medicine, Mount Sinai Hospital, Suite 1609, 600 Univ. Ave., Toronto, Ontario, Canada M5G IX5. jdp@ca.inter.net
Thiessen
Jake J
JJ
D001794:Blood Pressure / Q000502:physiology; D002908:Chronic Disease; D019332:Endothelin-1 / Q000096:biosynthesis* / Q000097:blood / Q000493:pharmacokinetics*; D005260:Female; D006333:Heart Failure / Q000378:metabolism*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007457:Iodine Radioisotopes; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D008954:Models, Biological
D019332:Endothelin-1; D007457:Iodine Radioisotopes