Optimizing fluid resuscitation in hypertrophic pyloric stenosis

Area of Science:

• Pediatric Surgery
• Pediatric Critical Care
• Pediatric Gastroenterology

Background:

• Hypertrophic pyloric stenosis (HPS) is the most common surgical diagnosis in infants.
• Electrolyte levels are crucial markers for resuscitation before anesthesia in HPS patients.
• Current resuscitation protocols often involve multiple fluid boluses and electrolyte panels, potentially delaying surgery.

Purpose of the Study:

• To predict the required volume of intravenous fluid boluses for electrolyte correction in infants with HPS based on initial electrolyte values.
• To identify specific electrolyte parameters that can guide fluid resuscitation strategies.

Main Methods:

• Retrospective review of 542 infants diagnosed with HPS from 2008-2014 at a single center.
• Abnormal electrolytes defined by specific chloride, bicarbonate, and potassium levels.
• Patients with abnormal electrolytes received 20ml/kg saline boluses and continuous fluids at 1.5 times maintenance.

Main Results:

• 202 out of 505 analyzed patients had electrolyte abnormalities.
• Patients with abnormal electrolytes had lower weight, longer hospital stays, and received more fluids and lab draws.
• Presenting chloride levels demonstrated high sensitivity and specificity in predicting the need for multiple saline boluses (AUC 0.71 for Cl(-) ≤80mmol/L and 3+ boluses).

Conclusions:

• Electrolyte abnormalities in HPS are associated with increased resource utilization.
• Presenting chloride levels are reliable indicators for guiding fluid resuscitation.
• Recommended protocol: two 20ml/kg saline boluses for Cl(-) ≤97mmol/L, and three boluses for Cl(-) <85mmol/L, to potentially reduce delays and costs.