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[Renal function in normal and malnourished children given different doses of vasopressin in continuous infusion]
Insights
Vasopressin affects kidney function differently in malnourished children compared to normal children. Malnourished children exhibit higher urine output and distinct responses to vasopressin, impacting water reabsorption and clearances.
Area of Science:
- Pediatric Nephrology
- Endocrinology
- Human Physiology
Background:
- Malnutrition is associated with altered kidney function, including increased urine production.
- The role of vasopressin in modulating renal parameters in malnourished pediatric populations requires further elucidation.
Purpose of the Study:
- To investigate the effects of continuous vasopressin infusion on renal function in malnourished children compared to healthy controls.
- To analyze specific parameters such as urine volume, osmolality, clearances, and electrolyte excretion.
Main Methods:
- Continuous infusion of vasopressin at varying doses (0.3-0.75 mU/m2/minute) in normal and malnourished children.
- Measurement of urine volume, osmolality, water reabsorption, para-aminohippuric acid (PAH), urea, and inulin clearances.
- Analysis of urinary sodium (Na) and potassium (K) excretion.
Main Results:
- Malnourished children demonstrated 3-5 times higher urine volume than normal children.
- Vasopressin induced an initial increase in urine volume, followed by a mild antidiuretic effect in normal groups, but significant antidiuresis in malnourished children.
- Transient decreases in PAH and inulin clearances were observed with vasopressin in malnourished groups, with a milder effect in normal groups.
- Increased natriuresis was noted in both malnourished and normal children receiving vasopressin.
Conclusions:
- Vasopressin exerts similar physiological effects in both normal and malnourished children, but the magnitude of these effects differs.
- Malnutrition significantly alters the renal response to vasopressin, particularly concerning water balance and solute excretion.
Abstract:
The effects of vasopressin administered by continuous infusion (0.75 and 0.5 mU/m2/minutes) was studied in two groups of three normal and two groups of 5 and 8 malnourished children given 0.5 and 0.3 mU/m2/minute. The following parameters were analyzed: urine volume, osmolality, water reabsorption, PAH, urea and inulin clearances, Na and K urinary excretion. Malnourished children had a urine volume 3 to 5 times higher than the normal groups. Vasopressin increased urine volume initially, but a mild antidiuretic effect followed in the normal groups. In malnourished children with a high CH2O, antidiuresis showed quite important figures with vasopressin. A transient fall in PAH and inulin clearances was observed with vasopressin in both malnourished groups with a mild drop in the normal group. Natriuresis with a higher % of the filtered sodium excretion was observed in the malnourished groups and in normal children with 0.5 mU of vasopressin. These results show that vasopressin had similar effects, but at a different level in the normal and malnourished children that we studied.