Related Experiment Video
Updated: May 10, 2026
A Modified Sonographic Algorithm for Image Acquisition in Life-Threatening Emergencies in the Critically Ill Newborn
Published on: April 7, 2023
[Sonographic screening of basilar arteries reduces the risk of sudden infant death]
1Klink für Kinder und Jugendliche, Sozialstiftung Bamberg, Bugerstr. 80, 96049, Bamberg, Deutschland, Karl-heinz.deeg@sozialstiftung-bamberg.de.
Insights
Sudden infant death syndrome (SIDS) may be caused by brainstem hypoperfusion during head rotation, particularly in the prone position. Doppler sonography can identify infants at risk, enabling preventative measures to reduce SIDS incidence.
Area of Science:
- Pediatrics
- Neurology
- Medical Imaging
Background:
- Sudden infant death syndrome (SIDS) is a leading cause of infant mortality with unclear etiology.
- Prone sleeping is a validated risk factor, but the underlying mechanism remains debated.
- Cervical artery compression during head rotation may cause brainstem hypoperfusion, a potential SIDS pathway.
Purpose of the Study:
- To investigate the link between head rotation, vertebral artery compression, and brainstem perfusion in infants.
- To identify infants at risk for SIDS using Doppler sonography to assess basilar artery blood flow.
- To evaluate the effectiveness of avoiding specific head positions in preventing SIDS.
Main Methods:
- Doppler sonography was used to measure basilar artery blood flow in infants in neutral and rotated head positions.
- Measurements were taken through the open fontanel, assessing flow velocity and waveform.
- Infants were categorized based on flow changes during head rotation, particularly in the prone position.
Main Results:
- In 98.7% of infants, basilar artery flow was unaffected by head rotation or position.
- A significant flow decrease (<50% of baseline) occurred in 1.3% of infants during head rotation.
- Pathological biphasic or retrograde flow during rotation was observed in 0.3% of infants, indicating potential risk.
Conclusions:
- Position-dependent hypoperfusion of the brainstem, detectable via Doppler sonography, is a potential mechanism for SIDS.
- Identifying infants with abnormal flow during head rotation allows for targeted preventative strategies.
- Avoiding head rotation that causes abnormal flow and monitoring affected infants can significantly reduce SIDS incidence.
Abstract:
Sudden infant death syndrome (SIDS) is the most frequent cause of death in the first year of life. The causes of SIDS remain unclear although multiple theories have been published in recent decades. However, some important risk factors associated with SIDS, such as prone sleeping have been validated. Over 85% of all SIDS victims were found in a prone position but it is unclear why the prone sleeping position is more dangerous than the supine sleeping position. A possible cause of SIDS is hypoperfusion of the brain stem during head rotation. Some infants show compression of the vertebral arteries at the craniocervical junction during head rotation, especially in the prone position and this may lead to a subsequent decrease of brain stem perfusion. If compression lasts for a longer time hypoperfusion of the brainstem and central apnea and bradycardia result, which can lead to SIDS. The decrease in brainstem perfusion occurs more often and is more pronounced in the prone position as the head is more rotated in the prone than in the supine position. Doppler sonographic flow measurements of the flow in the basilar artery through the open fontanel, allow the detection of patients at risk of position-dependent hypoperfusion of the brain. Flow measurements are obtained in a neutral position (head in midline) and during head rotation. In the vast majority of infants (98.7%) the flow in the basilar artery is independent of head rotation and body position. In rare cases (1.3%) flow velocities drop to below 50% of the initial value during head rotation. A pathological biphasic or even retrograde flow can be found during head rotation in only 0.3% of infants and these infants may have an increased risk for SIDS. To prevent SIDS head rotation which leads to an abnormal or pathological flow decrease during head rotation should be avoided. Additionally these infants should be monitored until blood flow in the basilar artery has returned to normal, which usually occurs during the first year of life. This approach reduced the incidence of SIDS in our patients from 1% to 0.04‰.
