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Published on: June 2, 2022
Anaesthetic considerations for the management of very low and extremely low birth weight infants
1Department of Anesthesiology, Osaka Medical Center and Research Institute for Maternal and Child Health, 840 Murodo-cho, Izumi, Osaka 594-1101, Japan. kinouchi@occn.zaq.ne.jp
Insights
Surgery for very low birth weight infants is increasing. Careful anesthetic management is crucial due to their unique physiology and sensitivity to pain, requiring precise oxygen, hemodynamic, and temperature control.
Area of Science:
- Neonatal Surgery
- Pediatric Anesthesiology
- Neonatal Intensive Care
Background:
- Increasing surgical opportunities for very low birth weight (VLBW) and extremely low birth weight (ELBW) infants.
- VLBW/ELBW infants are susceptible to prematurity-related morbidities and sensitive to pain and stress.
- Limited understanding of drug pharmacokinetics in preterm infants necessitates tailored anesthetic approaches.
Purpose of the Study:
- To outline key anesthetic considerations for surgical procedures in VLBW and ELBW infants.
- To highlight the importance of specialized anesthetic management in this vulnerable population.
Main Methods:
- Review of current evidence regarding anesthetic management in preterm infants undergoing surgery.
- Focus on physiological characteristics and pharmacokinetic differences in VLBW/ELBW infants.
Main Results:
- Preterm infants require smaller anesthetic doses with longer durations of effect due to immature clearance and elimination pathways.
- Anesthetic management must prioritize controlled inspired oxygen to prevent hyperoxia.
- Maintaining stable hemodynamic parameters is essential.
- Active prevention and management of hypothermia are critical throughout the perioperative period.
Conclusions:
- Anesthetic management for VLBW/ELBW infants requires meticulous attention to detail.
- Continuous monitoring and adjustment of inspired oxygen, hemodynamics, and temperature are vital for optimizing surgical outcomes.
- Safe transport to and from the operating theatre is an integral part of anesthetic care.
Abstract:
The opportunities for very low birth weight infants (birth weight < 1500 g) and extremely low birth weight infants (birth weight < 1000 g) to undergo surgery are increasing. These infants are prone to prematurity-related morbidities including respiratory distress syndrome, intraventricular haemorrhage, periventricular leukomalacia, retinopathy of prematurity, patent ductus arteriosus and necrotising enterocolitis. Evidence is accumulating that preterm infants are also sensitive to pain and stress. The pharmacokinetics of drugs in preterm infants is not fully understood but smaller doses of anaesthetic drugs are usually required in preterm infants compared to term infants and older children and their effects last longer due to low clearance rates and longer elimination half-lives. Key anaesthetic considerations are (i) inspired oxygen concentration that should be adjusted to avoid hyperoxia, (ii) haemodynamic parameters that should be kept stable and (iii) prevention of hypothermia by using adequate measures to keep the infants warm. These precautions must be continuously taken during the operation and the transport to and from the operating theatre.
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