There were no significant changes in the patients' mean weight and serum creatinine and sodium concentrations throughout the trial.

Duodenogastric reflux is indicated when sodium concentrations rise above 50 mmol/l.

Measurement of sodium concentrations is simple to perform and offers the possibility of prolonged continuous monitoring.

Monitoring of intragastric sodium concentration was well tolerated.

Duodenogastric reflux was identified when intragastric sodium concentrations exceeded 50 mmol/l.

The body (in particular the brain) adapts to the higher sodium concentration.

A patient suffering hyponatremia can be given a small volume of a concentrated salt solution intravenously to raise sodium concentrations in the blood.

If daily weights cannot be obtained, diuretics can also be guided by the urinary sodium concentration.

Relative loss of body water will cause sodium concentration to rise higher than normal, a condition known as hypernatremia.

If able to rehydrate properly, sodium concentration should be nearer to the maximum of the normal range.