oculocardiac reflex

The eyeball is mechanically stimulated when it is removed, compressed or pulled by the eye muscles, causing excessive vagus nerve excitement, resulting in arrhythmia, and slower pulse, called eye reflex. Reflex arc: trigeminal nerve branch → trigeminal pons nucleus → vagus nerve dorsal nucleus - myocardial response. Basic Information Specialist Category: Ophthalmology Classification: Neuroelectrophysiology Applicable gender: whether men and women apply fasting: not fasting Tips: The unsuitable people are those with slow heart rate, high myopia and glaucoma. Normal value After the eyeball is pressurized, the normal pulse per minute can be reduced by 10-20 times. Clinical significance Abnormal result More than 12 beats/min suggested that the parasympathetic (vagus) nerve function was enhanced, and the vagus nerve paralysis did not respond. If the compression pulse rate is not slowed down but accelerated, it suggests hypersympathetic function. People who need to be checked Patients with sympathetic dysfunction. High results may be diseases: precautions for primary brain stem injury in children Taboo before inspection: 1. Do not do strenuous exercise before checking. 2. Patients with glasses should take off their glasses before checking. Requirements for inspection: 1. If the doctor uses the right middle finger and forefinger to press on both sides of the eyeball, if you feel pain, you should inform the doctor in time so that the doctor can adjust the examination. 2, the body and mind should be relaxed during the examination to prevent the pulse from increasing due to excessive stress, affecting the results of the examination. Inspection process The patient is lying on his back and closing his eyes. The doctor puts the right middle finger and index finger on both sides of the patient's eyeball, gradually exerting pressure, but the patient should not feel pain. After 20-30s of pressure, the pulse rate is counted for 1min, and the normal pulse per minute can be reduced by 10- Twenty times, a decrease of 12 beats/min or more indicates an increase in vagus nerve function, and a decrease of 18-24 beats/min indicates that the vagus nerve function is significantly hyperactive. If the pulse rate does not decrease or increase after compression, it is called inversion reaction, suggesting sympathetic hyperfunction. Not suitable for the crowd This test is contraindicated in people with slow heart rate, high myopia, glaucoma or other eye diseases. Adverse reactions and risks Generally no adverse reactions.