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Perioperative changes in alpha 1-acid glycoprotein concentrations in infants undergoing major surgery
1Department of Paediatric Anaesthesia, Royal Liverpool Children's NHS Trust.
Insights
Preoperative alpha 1-Acid glycoprotein (AAG) levels in infants predict postoperative changes. Measuring AAG before surgery may identify infants at higher risk for drug toxicity.
Area of Science:
- Biochemistry
- Pharmacology
- Pediatric Surgery
Background:
- Alpha 1-Acid glycoprotein (AAG) is an acute phase protein binding basic drugs.
- Surgical stress can alter AAG concentrations, impacting drug efficacy and toxicity.
- Understanding AAG dynamics in infants is crucial for safe perioperative medication management.
Purpose of the Study:
- To investigate changes in AAG concentrations in infants undergoing major surgery.
- To determine the relationship between preoperative AAG levels and postoperative AAG responses.
- To assess the utility of preoperative AAG measurement in predicting drug toxicity risk.
Main Methods:
- Arterial blood samples collected from 50 infants undergoing major surgery.
- AAG concentrations measured using a rate nephelometric technique.
- Sampling occurred at anesthesia induction and daily for 7 days post-surgery.
Main Results:
- Mean preoperative AAG concentration was 0.38 mg ml-1, higher in urgent vs. elective surgery.
- AAG concentrations significantly increased post-surgery, peaking at 0.76 mg ml-1 by day 4.
- Infants with lower preoperative AAG (< 0.38 mg ml-1) showed a greater postoperative increase.
Conclusions:
- Surgical stress significantly elevates AAG levels in infants.
- Preoperative AAG concentration is a potential biomarker for identifying infants at risk of postoperative drug toxicity.
- Early postoperative drug management may benefit from AAG level monitoring.
Abstract:
alpha 1-Acid glycoprotein (AAG) is an acute phase protein that is responsible for binding basic drugs such as bupivacaine. In order to determine how AAG concentrations change in response to surgical stress, arterial blood samples were obtained from 50 infants undergoing major surgery, at induction of anaesthesia and daily for the next 7 days. AAG concentrations were measured using a rate nephelometric technique. The overall mean preoperative AAG concentration was 0.38 (SD 0.16) mg ml-1, although concentrations were significantly greater in infants undergoing urgent surgery compared with those undergoing elective surgery (P = 0.02). There were no significant correlations between gestational or postnatal age and preoperative AAG concentration. Mean AAG concentrations increased to 0.76 (0.18) mg ml-1 by day 4 after surgery and stayed at that concentration thereafter. Infants with preoperative AAG concentrations < 0.38 mg ml-1 showed a greater percentage increase in postoperative AAG concentrations than did infants with preoperative AAG concentrations > 0.38 mg ml-1 (P = 0.001). We conclude that preoperative measurement of AAG may identify those infants most at risk of drug toxicity in the early postoperative period.