Activity

Activity ID

5532

Expires

April 9, 2023

Format Type

Journal-based CME

CME Credit

1

Fee

$30
CME Provider

JAMA Ophthalmology

Description
Abstract

Importance:
Subconcussive head impacts have emerged as a complex public health concern. The oculomotor system is sensitive to brain trauma; however, neuro-ophthalmologic response to subconcussive head impacts remains unclear.

Objective:
To examine whether subconcussive head impacts cause impairments in neuro-ophthalmologic function as measured by the King-Devick test (KDT) and oculomotor function as measured by the near point of convergence.

Design, Setting, and Participants:
In this randomized clinical trial, adult soccer players were randomized into either a heading group or kicking (control) group. The heading group executed 10 headers with soccer balls projected at a speed of 25 mph. The kicking-control group followed the same protocol but with 10 kicks. Peak linear and rotational head accelerations were assessed with a triaxial accelerometer. The KDT speed and error and near point of convergence were assessed at baseline (preheading or prekicking) and at 0, 2, and 24 hours after heading or kicking.

Exposures:
Ten soccer-ball headings or kicks.

Main Outcomes and Measures:
The primary outcome was the group-by-time interaction of KDT speed at 0 hours after heading or kicking. The secondary outcomes included KDT speed at 2 hours and 24 hours after heading or kicking, KDT error, and near point of convergence.

Results:
A total of 78 individuals enrolled (heading group, n?=?40; kicking-control group, n?=?38). Eleven individuals (heading group: 4 women; mean [SD] age, 22.5 [1.0] years; kicking-control group, 3 women and 4 men; mean [SD] age, 20.9 [1.1] years) voluntarily withdrew from the study. Data from 67 participants with a mean (SD) age of 20.6 (1.7) years were eligible for analysis (heading, n?=?36; kicking-control, n?=?31). Mean (SD) peak linear accelerations and peak rotational accelerations per impact for the heading group were 33.2 (6.8) g and 3.6 (1.4) krad/s2, respectively. Conversely, soccer kicking did not induce a detectable level of head acceleration. Both groups showed improvements in KDT speed (heading group: 0 hours, -1.2 [95% CI, -2.2 to -0.1] seconds; P?=?.03; 2 hours, -1.3 [95% CI, -2.6 to 0] seconds; P?=?.05; 24 hours, -3.2 [95% CI, -4.3 to -2.2] seconds; P? These data support the hypothesis that neuro-ophthalmologic function is affected, at least in the short term, by subconcussive head impacts that may affect some individuals in some contact sports. Further studies may help determine if these measures can be a useful clinical tool in detecting acute subconcussive injury.

Trial Registration:
ClinicalTrials.gov Identifier: NCT03488381

Disclaimers
1. This activity is accredited by the American Medical Association.
2. This activity is free to AMA members.

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Commercial Support?
No

NOTE: If a Member Board has not deemed this activity for MOC approval as an accredited CME activity, this activity may count toward an ABMS Member Board’s general CME requirement. Please refer directly to your Member Board’s MOC Part II Lifelong Learning and Self-Assessment Program Requirements.

Educational Objectives

To examine whether subconcussive head impacts cause impairments in neuro-ophthalmologic function as measured by the King-Devick test (KDT) and oculomotor function as measured by the near point of convergence.

Keywords

Neurology, Neuro-ophthalmology, Ophthalmology, Sports Medicine, Traumatic Brain Injury

Competencies

Medical Knowledge

CME Credit Type

AMA PRA Category 1 Credit

Additional Information

doi:10.1001/jamaophthalmol.2020.0006

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