Related Experiment Video
Updated: Jul 16, 2025
Intraluminal Middle Cerebral Artery Occlusion MCAO Model for Ischemic Stroke with Laser Doppler Flowmetry Guidance in Mice
Published on: May 8, 2011
Carotid blood flow in abnormal head posture: a prospective observational study exploring facial asymmetry in
Ryan L Freedman1, Nicholas Mielke2, Edmond Younes3
1Department of Ophthalmology, Visual and Anatomical Sciences, Kresge Eye Institute, Wayne State University School of Medicine, Detroit, Michigan.
Insights
Abnormal head posture (AHP) does not significantly alter common carotid artery blood flow (CCBF). This suggests AHP is not the cause of facial asymmetry in strabismus patients.
Area of Science:
- Ophthalmology
- Pediatric Medicine
- Vascular Ultrasound
Background:
- Strabismus and ocular torticollis can lead to abnormal head posture (AHP) in children.
- Facial asymmetry is a potential consequence of AHP, but its underlying mechanisms are not fully understood.
Purpose of the Study:
- To determine if abnormal head posture (AHP) affects common carotid artery blood flow (CCBF).
- To investigate the potential role of CCBF changes in the development of facial asymmetry associated with strabismus.
Main Methods:
- Prospective observational study involving pediatric subjects with AHP.
- Bilateral carotid artery ultrasound with spectral Doppler was performed in neutral and head-tilted positions.
- Primary outcome: change in ipsilateral CCBF; Secondary outcome: change in contralateral CCBF.
Main Results:
- No significant difference in CCBF was observed between neutral and head-tilted positions.
- Ipsilateral CCBF: 7.8 ± 1.8 mL/s vs 7.5 ± 2.0 mL/s (P = 0.4312).
- Contralateral CCBF: 7.8 ± 1.8 mL/s vs 8.1 ± 2.4 mL/s (P = 0.3401).
Conclusions:
- Common carotid artery blood flow (CCBF) remains stable despite abnormal head posture (AHP).
- The findings do not support CCBF fluctuation as an etiological factor for facial asymmetry in strabismus.
Purpose:
To investigate whether abnormal head posture (AHP) induces changes in common carotid artery blood flow (CCBF), thereby leading to the development of facial asymmetry in the setting of strabismus and ocular torticollis.
Methods:
This was a prospective observational study of pediatric subjects in an urban ophthalmology clinic who underwent bilateral carotid artery ultrasound examination with spectral Doppler in an upright, straight-head posture and with a head tilt of 30°-45° to the right and left. The primary outcome was change in carotid flow on the side of the head tilt. The secondary outcome was change in blood flow on the contralateral side of the head tilt.
Results:
Seventeen subjects were enrolled, and 34 carotid arteries were assessed. There was no significant difference between upright, straight-head position and head tilt in ipsilateral (7.8 ± 1.8 mL/s vs 7.5 ± 2.0 mL/s [P = 0.4312]) or contralateral (7.8 ± 1.8 mL/s vs 8.1 ± 2.4 mL/s [P = 0.3401]) CCBF.
Conclusions:
CCBF does not fluctuate with AHP and thus does not appear to be the etiology for facial asymmetry in strabismus.
More Related Videos
05:20A Murine Model of Ischemic Retinal Injury Induced by Transient Bilateral Common Carotid Artery Occlusion
Published on: November 12, 2020
03:26Author Spotlight: Advancing Stroke Research with Periorbital Doppler Monitoring of Regional Cerebral Blood Flow in Rodent Models
Published on: November 22, 2024
Related Concept Videos
01:26Arteries of the Head and Neck
The internal carotid arteries supply blood to the anterior portion of the cerebrum. They enter the...
01:30Assessment of Airway, Skin Color, and Use of Accessory Muscles
Introduction
The initial evaluation of a patient's respiratory system...
01:29Cardiovascular System Abnormal Findings I: Inspection and Palpation
Abnormal findings observed during an inspection