现在医学界又发现一些人对寒冷过敏。有些人暴露在寒冷环境中会出现皮疹,偶然发生哮喘样症状,如果不治疗,可能危及生命。新英格兰医药杂志一篇报告说:当某些人暴露于寒冷中,其血液中一种化学物质比正常水平高限多。这种化学物质被称为“血小板活化因子”,即PAF。令受试人两臂伸入冰水内,则两臂出现荨麻疹、水肿和划痕样改变,伴 Now the medical profession has found that some people are allergic to the cold. Some people have rashes when exposed to cold conditions and occasional asthma-like symptoms that can be life-threatening if left untreated. A report in the New England Journal of Medicine reports that when some people are exposed to the cold, one of their blood contains more chemicals than their normal levels. This chemical is called “platelet activating factor”, or PAF. So that the subjects into the ice water arm, then the two arm urticaria, edema and scratch-like changes, with