Fig. 3From: Neonatal rebound hyperkalemia associated with ritodrine alone: a case reportMechanism of neonatal rebound hyperkalemia by maternal ritodrine administration. After passing through the placenta, ritodrine stimulates insulin secretion by the fetal pancreatic beta cells, which increases cellular uptake of extracellular potassium. When ritodrine is interrupted by parturition, it is thought that the resulting suppression of insulin secretion causes potassium efflux from cellsBack to article page