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Updated: Jun 13, 2026
Non-invasive Optical Measurement of Cerebral Metabolism and Hemodynamics in Infants
Published on: March 14, 2013
Does caffeine impair cerebral oxygenation and blood flow velocity in preterm infants?
M B Tracy1, J Klimek, M Hinder
1Nepean Hospital Sydney West Area Health Service, Sydney, NSW, Australia. mark.tracy@ozemail.com.au
Insights
A 10 mg/kg caffeine base loading dose significantly reduced cerebral oxygenation and blood flow velocity in preterm infants by 1 hour, with partial recovery observed by 4 hours post-dose.
Area of Science:
- Neonatal physiology
- Pharmacology
- Cerebral hemodynamics
Background:
- Caffeine is commonly used in preterm infants to treat apnea of prematurity.
- The effects of caffeine loading doses on cerebral hemodynamics and oxygenation require further investigation.
Purpose of the Study:
- To evaluate the impact of an intravenous 10 mg/kg caffeine base loading dose on cerebral oxygenation, cerebral blood flow velocity, and cardiac output in preterm infants.
Main Methods:
- Preterm neonates (<34 weeks gestation) were assessed using Doppler cerebral sonography, cardiac echocardiography, and near-infrared spectroscopy.
- Measurements were taken at 1 and 4 hours post-caffeine administration.
Main Results:
- A significant decrease in Anterior Cerebral Artery blood flow velocity (14-17.7%) and cerebral tissue oxygenation (9.5%) was observed at 1 hour post-dose.
- These parameters showed partial recovery by 4 hours.
- No significant changes were noted in cardiac output, transcutaneous oxygen saturation, PCO2, or vascular resistance.
Conclusions:
- The 10 mg/kg caffeine base loading dose transiently reduces cerebral oxygenation and blood flow velocity in preterm infants.
- These hemodynamic changes are partially reversible within 4 hours.
Aim:
The aim of the study is to assess the effects of an intravenous 10 mg/kg loading dose of caffeine base in cerebral oxygenation, cerebral Doppler blood flow velocity and cardiac output in preterm infants.
Methods:
Preterm neonates <34 weeks gestation were investigated at 1 and 4 h following the loading dose of caffeine using Doppler cerebral sonography, cardiac echocardiography and cerebral spatially resolved near-infrared spectroscopy.
Results:
Forty infants were studied with a mean gestational age (mean ± standard deviation) of 27.7 (±2.5) weeks, birth weight of 1155 (±431) g and a postnatal age of 2.8 (±2.2) days. Mean Anterior Cerebral Artery peak and time average mean blood flow velocity fell significantly by 14% and 17.7%, respectively at 1 h post-caffeine loading dose, which recovered partially by 4 h. Cerebral Tissue Oxygenation Index fell from pre-dose levels by 9.5% at 1 h with partial recovery to 4.9% reduced at 4 h post-dose. There were no significant changes in left or right ventricular output, transcutaneous oxygen saturation, transcutaneous PCO(2) or total vascular resistance.
Conclusions:
A loading dose of 10 mg/kg caffeine base resulted in significant reduction at 1 h post-dose in cerebral oxygenation and cerebral blood flow velocity with partial recovery at 4 h.
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