Aspects of pulse oximetry screening for critical congenital heart defects: when, how and why?

Area of Science:

• Neonatal screening
• Pediatric cardiology
• Public health

Background:

• Pulse oximetry (PO) screening for critical congenital heart defects (CCHD) is increasingly adopted globally.
• PO screening is recognized for its effectiveness, simplicity, speed, reliability, and cost-efficiency.
• It does not impose an additional burden on parents or caregivers.

Purpose of the Study:

• To provide a comprehensive overview of pulse oximetry screening for CCHD.
• To highlight key considerations for implementing PO screening methodology.
• To inform optimal protocol selection for CCHD screening.

Main Methods:

• Review of existing studies on PO screening for CCHD.
• Analysis of factors influencing test accuracy, including target definition, gestational age, screening timing, and antenatal CCHD detection.
• Comparison of screening accuracy using post-ductal measurements versus pre-ductal and post-ductal measurements.

Main Results:

• PO screening is effective, simple, quick, reliable, and cost-effective for CCHD detection.
• Test accuracy is influenced by various factors; early screening may increase false positives but allows earlier pathology detection.
• Screening accuracy is comparable between post-ductal only and pre- and post-ductal measurements, though the latter identifies additional CCHD cases.
• Higher altitudes may increase false positives; non-cardiac pathology is found in a significant percentage of false positives.
• Screening is feasible in neonatal intensive care units and out-of-hospital settings.

Conclusions:

• Pulse oximetry screening is a valuable tool for identifying CCHD.
• Optimizing screening protocols requires careful consideration of factors like timing, measurement sites, and interpretation tools.
• Training caregivers and utilizing technology can enhance screening quality and implementation effectiveness.