4 results on '"Kennedy, Eric A."'
Search Results
2. Safety of School Playgrounds: Field Analysis From a Randomized Sample.
- Author
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Olsen, Heather and Kennedy, Eric
- Subjects
PREVENTION of injury ,CHILDREN'S accident prevention ,ELEMENTARY schools ,PLAY ,RISK assessment ,STATISTICAL sampling ,SCHOOL nursing ,DATA analysis software ,DESCRIPTIVE statistics - Abstract
Research supports recess, however, playground injuries are prevalent with more than 200,000 cases per year requiring medical attention. School playgrounds are among the leading location for injury. The purpose was to identify the safety and risk factors of playground environments and impact attenuation characteristics of surfacing materials. Results demonstrated 46% playground spaces protected students from traffic. Results found 75% of playgrounds were exposed to full sun, and unitary surface materials were up to 49°F warmer than the air temperature. There was an increase in the probability of risk whether equipment height was over 9 ft for loose fill surfacing materials or over 6 ft for unitary surfaces. Loose strings or ropes looped over equipment were found on 23% of playgrounds. This study provides discussion and data pertaining to numerous aspects of playground safety. Strategies for school nurses are shared to shape policies and education for playground safety practices. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
3. Evaluation of Different Projectiles in Matched Experimental Eye Impact Simulations.
- Author
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Weaver, Ashley A., Kennedy, Eric A., Duma, Stefan M., and Stitzel, Joel D.
- Subjects
- *
BLINDNESS , *VISION disorders , *OCULAR injuries , *MULTIVARIATE analysis , *STATISTICAL correlation - Abstract
Eye trauma results in 30,000 cases of blindness each year in the United States and is the second leading cause of monocular visual impairment. Eye injury is caused by a wide variety of projectile impacts and loading scenarios with common sources of trauma being motor vehicle crashes, military operations, and sporting impacts. For the current study, 79 experimental eye impact tests in literature were computationally modeled to analyze global and localized responses of the eye to a variety of blunt projectile impacts. Simulations were run with eight different projectiles (airsoft pellets, baseball, air gun pellets commonly known as BBs, blunt impactor, paintball, aluminum, foam, and plastic rods) to characterize effects of the projectile size, mass, geometry, material properties, and velocity on eye response. This study presents a matched comparison of experimental test results and computational model outputs including stress, energy, and pressure used to evaluate risk of eye injury. In general, the computational results agreed with the experimental results. A receiver operating characteristic curve analysis was used to establish the stress and pressure thresholds that best discriminated for globe rupture in the matched experimental tests. Globe rupture is predicted by the computational simulations when the corneoscleral stress exceeds 17.21 MPa or the vitreous pressure exceeds 1.01 MPa. Peak stresses were located at the apex of the cornea, the limbus, or the equator depending on the type of projectile impacting the eye. A multivariate correlation analysis revealed that area-normalized kinetic energy was the best single predictor of peak stress and pressure. Additional incorporation of a relative size parameter that relates the projectile area to the area of the eye reduced stress response variability and may be of importance in eye injury prediction. The modeling efforts shed light on the injury response of the eye when subjected to a variety of blunt projectile impacts and further validate the eye model's ability to predict globe rupture. Results of this study are relevant to the design and regulation of safety systems and equipment to protect against eye injury. [ABSTRACT FROM AUTHOR]
- Published
- 2011
- Full Text
- View/download PDF
4. Eye injury from electrical weapon probes: Mechanisms and treatment.
- Author
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Kroll MW, Ritter MB, Kennedy EA, Siegal NK, Shinder R, Brave MA, and Williams HE
- Subjects
- Adolescent, Adult, Biomechanical Phenomena, Blindness etiology, Blindness pathology, Eye Enucleation, Eye Injuries, Penetrating etiology, Female, Forensic Ballistics, Humans, Male, Middle Aged, Models, Biological, Police legislation & jurisprudence, United States, Young Adult, Conducted Energy Weapon Injuries pathology, Eye Injuries, Penetrating pathology
- Abstract
Purpose: While generally reducing morbidity and mortality, TASER® electrical weapons have risks associated with their usage, including burn injuries and head and cervical trauma associated with uncontrolled falls. The primary non-fatal complications appear to be significant eye injury but no analysis of the mechanisms or suggested treatments has been published., Methods: We used a biomechanical model to predict the risk of eye injury as a function of distance from the weapon muzzle to the eye. We compared our model results to recently published epidemiological findings. We also describe the typical presentation and suggest treatment options., Results: The globe rupture model predicted that a globe rupture can be expected (50% risk) when the eye is within 6 m of the muzzle and decreases rapidly beyond that. This critical distance is 9 m for lens and retinal damage which is approximately the range of the most common probe cartridges. Beyond 9 m, hyphema is expected along with a perforation by the dart portion of the probe. Our prediction of globe rupture out to 6 m (out of a typical range of 9 m) is consistent with the published risk of enucleation or unilateral blindness being 69 ± 18%, with an eye penetration., Conclusions: Significant eye injury is expected from a penetration by an electrical weapon probe at close range. The risk decreases rapidly at extended distances from the muzzle. Not all penetrating globe injuries from electrical weapon probes will result in blindness., (Copyright © 2018 Elsevier Inc. All rights reserved.)
- Published
- 2019
- Full Text
- View/download PDF
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