Reduction in blood flow to the head results from the use of the neck hold commonly referred to as the carotid sleeper. Using ultrasonic and laser-Doppler blood flow monitoring devices, quantitative assessment of the decrease in blood flow to the head was measured. During the application of the carotid sleeper neck hold, blood flow to the head decreased by 85% (mean value) and reached its lowest point in 6 seconds. Other physiological parameters affected by the neck hold are also reported.
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