Author Interviews, Fertility, JAMA, Pediatrics / 11.08.2015
Long Term Hypoxic Events Linked To Adverse Outcomes In Very Preterm Infants
MedicalResearch.com Interview with:
Prof. Dr. med. Christian F. Poets
Neonatologie, Univ.-Klinikum Tübingen
Tübingen Germany
Medical Research: What is the background for this study?
Prof. Poets: Episodes of intermittent hypoxemia (lack of oxygen) and bradycardia (slow heart rate) are common in very preterm infants and often a subject of considerable concern. However, up to now there has been a lack of knowledge as to how often or how long such episodes may occur without increasing an infant’s risk for impaired development or even death.
In this study, we utilized long-term recordings (lasting 8-12 weeks) of oxygen saturation and heart rate obtained as part of the Canadian Oxygen Trial (COT), a large study performed in extremely immature infants and comparing a higher with a lower oxygen saturation target range (85-89 vs. 91-95% oxygen saturation measured by pulse oximetry). For this secondary analysis, we wanted to test the hypotheses that spending a high proportion of time at an oxygen saturation below 80% or a pulse rate <80 beats per minute increases the risk of the following adverse outcomes:
- Death after reaching a post-menstrual age of 36 weeks (i.e. 4 weeks before their due date) or disability, determined at 18-22 months corrected age and defined as motor impairment, cognitive or language delay, severe hearing loss, or bilateral blindness;
- Motor impairment (determined at 18-22 months corrected age);
- Cognitive or language delay (determined at 18-22 months corrected age);
- Severe retinopathy of prematurity.