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(Stroke. 2004;35:1985.)
© 2004 American Heart Association, Inc.

Original Contributions

Transcranial Infrared Laser Therapy Improves Clinical Rating Scores After Embolic Strokes in Rabbits

From the Department of Neuroscience (P.A.L., J.A.Z.), University of California San Diego; the Veterans Administration San Diego Healthcare System (P.A.L., J.W., J.A.Z.), San Diego, Calif; and the Veterans Medical Research Foundation (P.A.L., J.W., J.A.Z.), San Diego, Calif.

Correspondence to Dr Paul A. Lapchak, University of California San Diego, Department of Neuroscience, MTF 316, 9500 Gilman Drive, La Jolla, CA 92093-0624. E-mail plapchak{at}ucsd.edu

Background and Purpose— Because photon energy delivered using a low-energy infrared laser may be useful to treat stroke, we determined whether transcranial laser therapy would improve behavioral deficits in a rabbit small clot embolic stroke model (RSCEM).

Methods— In this study, the behavioral and physiological effects of laser treatment were measured. The RSCEM was used to assess whether low-energy laser treatment (7.5 or 25 mW/cm²) altered clinical rating scores (behavior) when given to rabbits beginning 1 to 24 hours postembolization. Behavioral analysis was conducted from 24 hours to 21 days after embolization, allowing for the determination of the effective stroke dose (P₅₀) or clot amount (mg) that produces neurological deficits in 50% of the rabbits. Using the RSCEM, a treatment is considered beneficial if it significantly increases the P₅₀ compared with the control group.

Results— In the present study, the P₅₀ value for controls were 0.97±0.19 mg to 1.10±0.17 mg; this was increased by 100% to 195% (P₅₀=2.02±0.46 to 2.98±0.65 mg) if laser treatment was initiated up to 6 hours, but not 24 hours, postembolization (P₅₀=1.23±0.15 mg). Laser treatment also produced a durable effect that was measurable 21 days after embolization. Laser treatment (25 mW/cm²) did not affect the physiological variables that were measured.

Conclusions— This study shows that laser treatment improved behavioral performance if initiated within 6 hours of an embolic stroke and the effect of laser treatment is durable. Therefore, transcranial laser treatment may be useful to treat human stroke patients and should be further developed.

Key Words: laser • neuroprotection • embolism • stroke, acute • stroke, ischemic • clinical trials

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