Effects of potassium chloride and potassium bicarbonate on endothelial function, cardiovascular risk factors, and bone turnover in mild hypertensives.
To determine the effects of potassium supplementation on endothelial function, cardiovascular risk factors, and bone turnover and to compare potassium chloride with potassium bicarbonate, we carried out a 12-week randomized, double-blind, placebo-controlled crossover trial in 42 individuals with untreated mildly raised blood pressure. Urinary potassium was 77+/-16, 122+/-25, and 125+/-27 mmol/24 hours after 4 weeks on placebo, potassium chloride, and potassium bicarbonate, respectively. There were no significant differences in office blood pressure among the 3 treatment periods, and only 24-hour and daytime systolic blood pressures were slightly lower with potassium chloride. Compared with placebo, both potassium chloride and potassium bicarbonate significantly improved endothelial function as measured by brachial artery flow-mediated dilatation, increased arterial compliance as assessed by carotid-femoral pulse wave velocity, decreased left ventricular mass, and improved left ventricular diastolic function. There was no significant difference between the 2 potassium salts in these measurements. The study also showed that potassium chloride reduced 24-hour urinary albumin and albumin:creatinine ratio, and potassium bicarbonate decreased 24-hour urinary calcium, calcium:creatinine ratio, and plasma C-terminal cross-linking telopeptide of type 1 collagen significantly. These results demonstrated that an increase in potassium intake had beneficial effects on the cardiovascular system, and potassium bicarbonate may improve bone health. Importantly, these effects were found in individuals who already had a relatively low-salt and high-potassium intake.
He
Feng J
FJ
Wolfson Institute of Preventive Medicine, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK. f.he@qmul.ac.uk
Marciniak
Maciej
M
Carney
Christine
C
Markandu
Nirmala D
ND
Anand
Vidya
V
Fraser
William D
WD
Dalton
R Neil
RN
Kaski
Juan C
JC
MacGregor
Graham A
GA
D000328:Adult; D000419:Albuminuria / Q000188:drug therapy / Q000453:epidemiology / Q000503:physiopathology; D001639:Bicarbonates / Q000008:administration & dosage*; D001794:Blood Pressure / Q000187:drug effects; D016723:Bone Remodeling / Q000187:drug effects* / Q000502:physiology; D001916:Brachial Artery / Q000187:drug effects / Q000502:physiology; D002118:Calcium / Q000652:urine; D018592:Cross-Over Studies; D004730:Endothelium, Vascular / Q000187:drug effects*; D005260:Female; D006801:Humans; D006973:Hypertension / Q000188:drug therapy* / Q000453:epidemiology / Q000503:physiopathology; D017379:Hypertrophy, Left Ventricular / Q000188:drug therapy / Q000453:epidemiology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D011188:Potassium / Q000652:urine; D011189:Potassium Chloride / Q000008:administration & dosage*; D017680:Potassium Compounds / Q000008:administration & dosage*; D011673:Pulsatile Flow / Q000187:drug effects; D012307:Risk Factors; D012720:Severity of Illness Index; D017673:Sodium Chloride, Dietary / Q000008:administration & dosage
D001639:Bicarbonates; D017680:Potassium Compounds; D017673:Sodium Chloride, Dietary; D011189:Potassium Chloride; C026329:potassium bicarbonate; D011188:Potassium; D002118:Calcium