Landolfia's sign

The Landolfissign examination is an auxiliary examination method for checking whether a blood vessel is normal. Landolfissign refers to the bilateral pupils shrinking when the ventricles contract, and expand when diastolic. Dilated pupils are the result of increased excitability of parasympathetic nerve fibers in the oculomotor nerve; dilated pupils are due to increased excitability of sympathetic nerve fibers. This is a peripheral vascular sign of aortic valve insufficiency. Through this examination, the lesion and the corresponding symptoms can be judged. Basic Information Specialist Category: Ophthalmic Examination Category: Physical Examination Applicable gender: whether men and women apply fasting: not fasting Tips: Maintain a normal diet and schedule. Normal value In normal time, the bilateral pupils did not shrink when the ventricles contracted, and did not expand when dilated. Showing a constant state. Clinical significance Abnormal result It refers to the bilateral pupils shrinking when the ventricles contract, and expand when diastolic. This is a peripheral vascular sign of aortic valve insufficiency. Regular physical examination items for people who need to be examined, abnormal blood vessels. Precautions Forbidden before examination: Maintain a normal diet and schedule. Requirements for inspection: The doctor should have sufficient light when checking, otherwise it is difficult to observe changes. During the examination, the patient actively cooperates with the doctor, and should not be overly stressed during the examination, so as not to affect the result. Inspection process The examination method is that the doctor judges the symptoms by observing the changes of the pupil. The principle is that the pupil dilation is the result of the excitability of the parasympathetic nerve fibers of the oculomotor nerve; the pupil dilation is caused by the increased excitability of the sympathetic nerve fibers. In patients with aortic regurgitation, during ventricular systole, left ventricular ejection increased and systolic blood pressure increased significantly. In diastolic phase, diastolic blood pressure decreased significantly due to blood flow to the left ventricle. When the systolic blood pressure rises, the afferent impulse of carotid sinus and aortic arch baroreceptor increases, the inhibitory effect on the medullary sympathetic nerve center is strengthened, and the parasympathetic nerve excitability is increased, leading to pupil dilation; when the diastolic blood pressure is decreased, the medullary sympathetic nerve Increased excitability leads to dilated pupils. Not suitable for the crowd Inappropriate people: severe blood vessels and heart failure.

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