Objective To analyze the clinical efficacy of thoracic paravertebral nerve block with ozone in the treatment of postherpetic neuralgia. Methods Eighty-five patients suffered postherpetic neuralgia were divided into 4 groups: Group A (oral drugs + intramuscular injection of vitamin B12 + local nerve block of lesion area). Group B (oral drugs + intramuscular injection of compound trivit... https://halohealthcarers.shop/product-category/air-purifiers/