A 5-week-old infant with projectile vomiting and severe dehydration is brought to the OR for pyloromyotomy. The most appropriate anesthetic management would be:

A 5-week-old infant with projectile vomiting and severe dehydration is brought to the OR for pyloromyotomy. The most appropriate anesthetic management would be:

• A. Induction with IM ketamine, glycopyrrolate, and succinylcholine with cricoid pressure followed by immediate intubation
• B. Inhalation induction with halothane
• C. Awake intubation
• D. Postpone surgery until fluids and electrolytes are corrected

Answer: (D)

The key idea is that pyloric stenosis in a young infant causes dehydration with a hypochloremic metabolic alkalosis and electrolyte disturbances. Before safely putting the child under anesthesia or operating, you must correct these abnormalities and restore intravascular volume. Correcting the fluids and electrolytes reduces the risk of severe perioperative complications such as arrhythmias, poor cardiac response to anesthetic drugs, and postinduction apnea, and it also lowers the chance of aspiration by decreasing gastric volume and improving overall stability. Postponing the surgery until fluids and electrolytes are corrected is the safest choice because it directly addresses the child’s abnormal physiology. Induction methods like a rapid airway-securing technique in a full-stomach, dehydrated infant carry high aspiration risk and can provoke instability in the setting of electrolyte disturbances. An inhalational induction with halothane, while sometimes used, doesn’t fix the underlying imbalance and can still worsen cardiovascular tolerance in a dehydrated patient. Awake intubation is impractical in a 5-week-old. By awaiting correction of dehydration and metabolic alkalosis, anesthesia and the postoperative course become much safer and smoother, and the definitive surgery can proceed once the child is stabilized.

The key idea is that pyloric stenosis in a young infant causes dehydration with a hypochloremic metabolic alkalosis and electrolyte disturbances. Before safely putting the child under anesthesia or operating, you must correct these abnormalities and restore intravascular volume. Correcting the fluids and electrolytes reduces the risk of severe perioperative complications such as arrhythmias, poor cardiac response to anesthetic drugs, and postinduction apnea, and it also lowers the chance of aspiration by decreasing gastric volume and improving overall stability.

Postponing the surgery until fluids and electrolytes are corrected is the safest choice because it directly addresses the child’s abnormal physiology. Induction methods like a rapid airway-securing technique in a full-stomach, dehydrated infant carry high aspiration risk and can provoke instability in the setting of electrolyte disturbances. An inhalational induction with halothane, while sometimes used, doesn’t fix the underlying imbalance and can still worsen cardiovascular tolerance in a dehydrated patient. Awake intubation is impractical in a 5-week-old. By awaiting correction of dehydration and metabolic alkalosis, anesthesia and the postoperative course become much safer and smoother, and the definitive surgery can proceed once the child is stabilized.