Interventions for non-oliguric hyperkalaemia in preterm neonates.

Area of Science:

• Neonatal medicine
• Pediatric nephrology
• Clinical pharmacology

Background:

• Non-oliguric hyperkalaemia is a frequent complication in very low birth weight (VLBW) and preterm infants within the first 48 hours of life.
• Defined as plasma potassium > 6.5 mmol/L without acute renal failure, it poses significant risks to newborns.

Purpose of the Study:

• To evaluate the effectiveness and safety of interventions for non-oliguric hyperkalaemia in preterm or VLBW infants.
• Focus on interventions used within the first 72 hours of life, with serum potassium > 6.0 mmol/L and urine output > 0.5 ml/kg/hour.

Main Methods:

• Systematic review of randomized and quasi-randomized controlled trials identified through comprehensive database searches (CENTRAL, MEDLINE, EMBASE, CINAHL).
• Interventions included potassium redistribution (insulin/glucose, sodium bicarbonate), elimination (diuretics, resins, exchange transfusion, dialysis, salbutamol/albuterol), or arrhythmia prevention (calcium).
• Primary outcome was all-cause mortality; secondary outcomes included common adverse events in preterm infants.

Main Results:

• Three small trials with 74 infants were included; methodological quality was uncertain.
• Insulin and glucose showed a borderline significant reduction in all-cause mortality compared to cation-exchange resin (RR 0.18).
• Albuterol inhalation effectively reduced serum potassium levels, with no observed differences in mortality or other clinical outcomes compared to saline.

Conclusions:

• Due to limited data from small, uncertain quality studies, definitive clinical practice recommendations cannot be made.
• Insulin and glucose appear preferable to rectal cation-resin for hyperkalaemia in preterm infants.
• Further research, potentially comparing insulin/glucose and albuterol, is warranted; other interventions lack sufficient evidence from RCTs.