NURS 232 Pharmacologic Considerations for Infants & Children (3)
Pharmacologic Considerations for Infants & Children: Key Points for New Nurses
As a new nurse, it’s important to recognize that infants and children are not simply "mini-adults." Their developmental stages significantly affect how drugs are absorbed, distributed, metabolized, and excreted. These differences require special attention when administering medications.
Key Differences in Treatment
Children’s unique physiology means pharmacotherapy protocols differ significantly between adults and children.
Variability in children exists due to different developmental stages, which impact how their bodies handle medications.
Pharmacotherapeutics in Pediatrics
Not all drugs that are considered safe for adults are automatically safe for children.
About 75% of medications prescribed to children lack pediatric-specific labeling or guidelines.
As a nurse, you must be aware of off-label drug use until medications are tested and approved for pediatric use.
Pediatric Drug Dosage
Pediatric doses are typically calculated based on a child’s weight in kilograms.
The dose for children should never exceed the adult dose for a given medication.
Accuracy is crucial, especially in younger children (under 8-10 years old) whose weight may not yet reflect that of a small adult.
Example Calculation for Pediatric Dose:
Scenario: A child weighs 20 kg and requires a dosage of 30 mg/kg/day.
Calculation: 20 kg x 30 mg/kg/day = 600 mg/day.
Pharmacodynamics
Pharmacodynamics focuses on what the drug does to the body. In children, this is affected by their immature organ systems, which don’t function as efficiently as those of adults. The younger the child, the more pronounced these inefficiencies.
Pharmacokinetics
Pharmacokinetics deals with what the body does to the drug, including how it is absorbed, distributed, metabolized, and excreted. For pediatric patients, these processes vary based on age.
Absorption:
Infants have less acidic GI tracts compared to adults. Gastric pH reaches adult levels around 1 year of age, which can affect how drugs are absorbed.
Distribution:
Children have higher body water content and lower fat compared to adults.
Neonates produce fewer plasma proteins due to immature liver function, which impacts drug distribution.
The blood-brain barrier in neonates isn’t fully developed at birth, which can influence how drugs affect the brain.
Metabolism:
Immature liver function increases the risk of drug toxicity, as the liver may not metabolize drugs as efficiently.
Excretion:
Neonates, especially preterm infants, have immature kidneys, leading to slower drug elimination, which can increase the risk of drug accumulation.
Adverse Effects and Drug Interactions
Children may experience more severe adverse effects due to their immature organ systems.
Newborns can experience significant side effects either from direct medication administration or from maternal medication use during pregnancy.
Health Status Impact on Drug Absorption
A child’s health status can significantly influence how drugs are absorbed.
Conditions like diarrhea can decrease drug absorption due to reduced intestinal transit time.
Hepatic or renal diseases can hinder drug metabolism and excretion, which is critical to monitor.
Preventing Medication Errors in Pediatric Care
High-Risk Situations:
Children under 2 years old, especially in critical care settings like intensive care units and emergency departments, are at the highest risk for medication errors.
Also, be extra cautious with children receiving chemotherapy or IV medications, and ensure accurate weight documentation.
Common Challenges:
Identifying the correct dosage calculation can be challenging.
Inexperience with fractions, decimals, and ratios may cause errors.
Infrequent use of dosage formulas can result in miscalculations.
Strategies for Preventing Errors:
Always weigh the child before administering any medication.
Standardize processes and utilize reliable drug information sources.
Implement computerized drug ordering systems for accuracy.
Double-check all calculations to ensure the correct dose.
Broselow Tape
The Broselow Tape is an important tool used to quickly assess pediatric drug dosages based on the child’s weight. This color-coded system helps ensure the correct medication dose for the child’s size.
Case Example: Medication Errors
As you begin working with pediatric patients, be aware of the potential for significant medication errors. For example, the Quaid twins case highlighted the consequences of not double-checking medication doses. This case underscores the importance of vigilance and accuracy when administering drugs to children.
Questions & Additional Resources
As a new nurse, you might have questions about pediatric pharmacology. Always feel free to ask more experienced colleagues or consult additional resources to deepen your understanding of this area of nursing practice.