Unit
- Cardiovascular system: Neonates have a high proportion of noncontractile tissue and limited cardiac reserve. Stroke volume is relatively fixed, so cardiac output depends on heart rate. Anesthetic agents that cause bradycardia can significantly reduce cardiac output in infants.
- Respiratory system: Infants have a compliant chest wall, horizontal ribs, and a large tongue relative to the airway. Functional residual capacity is small, making them prone to rapid desaturation during apnea. Knowledge of airway anatomy guides mask ventilation and tube selection.
- Renal and hepatic function: Glomerular filtration and hepatic enzyme systems are immature at birth, prolonging clearance of many drugs. Dosing intervals for medications like opioids and muscle relaxants must be adjusted for age-related organ maturation.
- Neurologic development: The blood-brain barrier is more permeable in neonates, increasing sensitivity to central nervous system depressants. Neurotoxic effects of anesthetic agents are a subject of ongoing research, emphasizing the need for minimal effective doses.
- Thermoregulation: Infants have a larger surface-area-to-body-mass ratio and limited brown fat stores, predisposing them to hypothermia. Warmed fluids, forced-air warming, and warmed operating rooms are standard preventive measures.
- Body composition: Higher total body water and lower body fat in neonates affect distribution volumes of water-soluble and fat-soluble drugs. Dosing based on body weight alone may not be accurate; surface area or allometric scaling is often preferred.
- Hematologic differences: Fetal hemoglobin has a higher oxygen affinity, shifting the oxygen-hemoglobin dissociation curve to the left. Anemia is common in preterm infants, reducing oxygen-carrying capacity. Transfusion thresholds differ from adults.
- Airway anatomy: The larynx is more cephalad and funnel-shaped in infants, with the narrowest portion at the cricoid ring. Uncuffed endotracheal tubes were traditionally used, but cuffed tubes with proper sizing are now common to minimize air leak and aspiration risk.
Scope of Practice
Role: Anesthesia Technician in Pediatric Operating Room
Within scope:
- Preparing age-appropriate anesthesia equipment and circuits
- Assisting with patient positioning and monitoring setup
- Reinforcing sterile technique during induction and maintenance
Outside scope:
- Selecting or administering anesthetic agents
- Independently adjusting ventilator settings
- Interpreting physiologic monitor trends for clinical decisions
Quick Revision
- Neonatal cardiovascular system relies on heart rate for cardiac output; bradycardia is poorly tolerated.
- Infant airways are anatomically distinct, increasing risk of desaturation and difficult ventilation.
- Renal and hepatic immaturity affects drug clearance, requiring age-adjusted dosing.
- Thermoregulation is critical; hypothermia prevention protocols are mandatory.
- Anesthesia technicians support equipment setup and patient preparation within defined scope.
Disclaimer
Educational use only. Not intended for practical surgery, incisions, or other surgical procedures. It does not qualify you to perform physical operations.