Vnitr̆ní lékar̆ství
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Vnitr̆ní lékar̆ství · Feb 2009
[Pathophysiology of metabolic acidosis in patients with reduced glomerular filtration rate according to Stewart-Fencl theory].
Metabolic acidosis is a regular sign of renal insufficiency. Conventional assessment of acid-base balance using Henderson-Hasselbalch equation does not make identification of the cause of metabolic disorders possible as the serum HCO3- concentration might only reflect changes to the overall plasma ion spectrum. Therefore, we used the Stewart-Fencl approach that is based on a more detailed physical and chemical analysis and that showed that changes to serum HCO3- concentration are closely related to parameters not usually monitored in connection to acid-base balance. PATIENT GROUP AND METHODOLOGY: We performed a single measurement of arterial or capillary blood pH and pCO2 in 69 non-dialysed patients with glomerular filtration rate ranging from 0.04 to 0.88 ml/s/1.73 m2 according to MDRD, standard calculation of serum HCO3- concentration using Henderson-Hasselbalch equation was carried out, and serum albumin and ion concentrations (Na+, K+, Cl, Pi) plus creatinine and urea concentrations were determined from venous blood. ⋯ Reduction in [S-HCO3-] in non-dialysed patients with reduced glomerular filtration is predominantly associated with a decrease in [Na+-Cl-] difference, the quantitative contribution of which to metabolic acidosis is more significant than the strong acids retention. In addition to [S-Cl-] increase, [S-Na+] reduction too has a major role in reducing the [Na+-Cl-] difference.
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Vnitr̆ní lékar̆ství · Feb 2009
Review[The combination of an ACE inhibitor and a calcium channel blocker is an optimal combination for the treatment of hypertension].
Combination of drugs from different classes of antihypertensives provides an additional antihypertensive effect thus minimising the probability of adverse effects related to the dose of antihypertensive. Combination therapy is indicated for the following groups of hypertensive patients: (a) all hypertensive patients whose systolic blood pressure exceeds the target systolic blood pressure value by > 20 mm Hg, or whose diastolic blood pressure exceeds the target diastolic blood pressure value by > 10 mm Hg; (b) in patients with diabetes mellitus (because the target values are < 130/80 mm Hg); (c) patients with target organ damage; (d) patients with a kidney or cardiovascular disease (patients with IHD, patients after a cerebrovascular accident); (e) patients with overall cardiovascular risk according the SCORE > or = 5%. The advantage of fixed combinations resides in the fact that they increase compliance with treatment by reducing the number of pills taken by the patients. ⋯ The fixed combination of perindopril and amlodipine will be indicated for hypertensive patients with uncontrolled hypertension or cardiovascular risk factors. This fixed combination will also be ideal for patients with a higher risk of diabetes mellitus, i.e. patients with a higher fasting glycaemia, in patients with impaired glucose tolerance and in patients with the metabolic syndrome. We strongly believe that it will improve the control of hypertension in our hypertensive patients, and improve the cardioprotective and nephroprotective effect of hypertension therapy.