Determination of erythema

The erythema measurement is a method of detecting or treating a certain disease by using a certain distance between the ultraviolet lamp and the skin, the time required to illuminate the skin to cause erythema, and the length of time the erythema disappears. Ultraviolet rays are also called chemical lines. The erythema reaction produced after illuminating the body has anti-inflammatory, swelling, pain relief, desensitization and metabolism enhancement, and can also enhance the body's immune function. Basic Information Specialist classification: skin examination classification: X-ray Applicable gender: whether men and women apply fasting: not fasting Tips: Before the inspection, the ban can increase the photosensitive food (such as gray vegetables) and drugs (such as quinine). Normal value Another standard for biological doses is measured by the degree of erythema reaction, which is generally divided into the following levels: Sub-erythroid amount: no erythema is produced after irradiation, and the skin has no obvious reaction, less than 1 biological dose. Level 1 erythema: The skin is slightly reddish 6-8 hours after irradiation. There was no obvious sensation in the local area, and it disappeared within about 24 hours, while the skin was non-pigmented, which was 2-4 biological doses. Level of secondary erythema: 4 to 6 hours after irradiation, the skin appears erythema, the color is deeper than the first level, and the skin is slightly itchy. The erythema disappeared within 2 to 3 days, and the epidermis had mild desquamation and pigmentation, which was 4-8 biological doses. Level 3 erythema: 3-4 hours after irradiation, more obvious erythema, dark red color, mild edema, local hot pain. After 2 to 3 days, the skin began to peel off, and after 4 to 5 days, the erythema disappeared, and there was significant pigmentation, which was 10-20 biological doses. Level 4 erythema: purple erythema appears 1 to 2 hours after irradiation, exudate is produced, blisters are formed, and the patient feels severe pain. The erythema takes about 1 week to resolve. And leave a significant pigmentation, 20 to 30 biological doses. Clinical significance Abnormal result Different degrees of erythema and pigmentation. People who need to be checked Acute, intermittent, chronic gouty arthritis and synovitis, myositis, chondritis, osteophyritis, osteoporosis, post-surgical surgery and other patients. Precautions Forbidden before the test: Forbidden clothing can increase photosensitive food (such as gray vegetables) and drugs (such as quinine). Requirements for examination: After the first erythema exposure, check whether the erythema reaction is appropriate in order to adjust the dose. Each subsequent exposure should not exceed the range of the first exposure. Inspection process Operating procedures: 1 Prepare cloth, towel, ruler, etc. 2 Turn on the power, preheat the treatment lamp to make it stable. 3 According to the determined parts and methods, such as whole body irradiation, central volume irradiation, local irradiation, acupoint irradiation, porous irradiation, segmental irradiation, district irradiation, sleeve (closed) irradiation and the like. 4 Slightly expose the area to be exposed and keep it clean. The skin around the irradiated area is covered with cloth and towel. 5 Adjust the UV lamp so that the light source is perpendicular to the treatment center. The local illumination distance is usually 50 cm. 6 Turn off the power after treatment. Not suitable for the crowd Active tuberculosis, severe arteriosclerosis, hypertension, acute myocarditis, severe liver and kidney dysfunction, hyperthyroidism, lupus erythematosus, malignant tumor, acute generalized eczema, bleeding tendency, and taking photoallergic drugs, contraindications Use UV treatment. Adverse reactions and risks Generally no adverse reactions.