BACKGROUND Fluid and sodium balance is important for the success of long-term peritoneal dialysis. Convective transport is the major determinant for sodium removal during peritoneal dialysis using conventional dialysis solutions. However, recent studies showed that lower sodium concentration in dialysate could significantly increase sodium removal by increasing the diffusion gradient, thereby i...

Backgrounds: Patients with maintenance hemodialysis (MHD) have a high risk of cardiovascular disease, which is the leading cause of morbidity and mortality. The aim of the present study was to explore the relationship between the sodium gradient and the water load of MHD patients. Methods: Eighty one MHD patients were selected in the study. The serum sodium concentration, sodium gradient, inter...

A s a rule of thumb in clinical medicine, the serum sodium concentration decreases by 1.6 mEq/l for every 100 mg/dl increase in glucose concentration due to water shifts from the intracellular to the extracellular compartment (1). This correction factor is based on theoretical considerations and has not been well validated. An experimental study in healthy subjects found significantly greater d...

The mechanisms that modulate the renal excretion of sodium have not been completely defined. Impressive evidence has been assembled establishing the individual contributions of alterations in glomerular filtration rate (GFR), adrenal cortical activity, and some function of effective extracellular fluid (ECF) volume (1-4). A fourth factor influencing sodium excretion is the restraining action of...

To study the changes in electrolyte concentrations in cells of patients with congestive heart failure, we measured the sodium and potassium concentrations in erythrocytes obtained from 34 stabilized patients treated with only digoxin and not with diuretics in order to avoid the effects of miscellaneous drugs and acute water overload. Patients were divided into classes I-III according to the NYH...

The mechanisms of sodium-induced myocardial hypertrophy and vascular hypertrophy are poorly understood. We tested the hypothesis that a high sodium concentration can directly induce cellular hypertrophy. Neonatal rat myocardial myoblasts (MMbs) and vascular smooth muscle cells (VSMCs) were cultured in a 50:50 mixture of DMEM and M199 supplemented with 10% fetal bovine serum. When the monolayers...

1. Intracellular cation composition has been measured in the red cells from twenty patients with hyperthyroidism. The mean concentration of sodium was 11.18 m-mole/l red cells; in sixty normal control subjects the mean red cell sodium level was 7.04 m-mole/l. The difference between these two groups was highly significant. There was no measurable difference between the potassium concentration an...

It was thought previously that cardiac muscle gap junctions provide low-resistance connections between cells and permit the local-circuit current to flow. Some evidences show that myocardial cells may not require low-resistance connections for successful propagation of the action potential (AP). It seems that some other types of mechanisms must be involved in AP propagation. In this article, we...

Anesthetized dogs receiving an infusion of chlorothiazide and ethacrynic acid were given 600-ml infusions of distilled water or dilute dextrose solutions. The absolute rate of tubular sodium reabsorption was depressed, and the glomerular filtration rate was increased during the water loading, despite the associated decreases in plasma sodium concentration and decreases in the filtered load of s...

A method has been developed for determination of sodium concentration (activity) in urine using a glass electrode designed to be especially sensitive to sodium ion activity. The urine is diluted 2:20 with Tris buffer (pH 8.0) and sodium activity measured by dipping a sodium electrode and calomel reference electrode in the diluted specimen and obtaining a millivolt reading with a sensitive pH me...