久蹲站起后头晕,到底是低血糖还是低血压?
大家可能都有过这种经历,蹲下时突然改变体位改为站立,就会出现眼前开始模糊或者眩晕的症状。这种情况其实并不少见,大家可能会怀疑自己是不是贫血或者低血糖。
虽然贫血和低血糖都会有眼前模糊或者眩晕的表现,但贫血患者通常会有脸色苍白、身体无力等表现,而低血糖患者通常会有饥饿感、心慌、冒虚汗等表现,所以大家可以依此来辨别是否是贫血或者低血糖。如果蹲时突然改变体位改为站立,眼前开始模糊或者眩晕,则可能为体位性低血压,又称之为直立性脱虚。
提到体位性低血压这个名字,大家可能都比较陌生,目前国际上较通用的一种诊断方法是:从卧位转为立位3min以内,收缩压下降超过20mmHg,或者是舒张压下降超过10mmHg,伴或者不伴各种低灌注症状的临床综合征。当我们从蹲位转为立位时,心脏需要将大量血液送运至大脑,如果各个器官反应过慢,则会使血液无法及时送达,人体则会出现大脑缺氧时的症状,即头晕目眩、视物障碍、力软,或出现容易昏倒甚至休克。
需要注意的是:长期服用抗高血压、镇静药、抗肾上腺素、血管扩张剂等药物的人和患有糖尿病、原发性高血压以及冠心病等患者更容易发生体位性低血压。因此,患有体位性低血压的患者,尤其是老年患者,一定要注意防止跌倒、晕厥产生的骨折、休克等意外以及心血管问题的突发。
因为低体位性低血压常常会导致患者摔到,晕倒还极有可能因大脑缺血诱发心血管的突发病(卒中)。此外,除了头晕目眩、视物障碍的神经系统症状外,很多体位性低血压患者还会出现心脏及周围大动脉缺血(呼吸困难、胸痛、心悸、四肢发冷等)、消化道(消化不良、呕吐等),部分患者还可见自主神经功能相关的症状,如焦虑、发抖等等。
在治疗上,目前没有研究出特效药物,只能根据患者具体病因针对治疗。我们要尽量避免可能引起患病的因素(快速变换体位、长时间卧床、胸腹腔压力过大);饱餐和大量饮酒容易诱发低血压。所以提倡我们规律饮食、少食多餐,不能暴饮暴食,不酗酒,餐后适当休息后再进行活动;同时,要坚持适当的体育锻炼,如游泳、散步等,增强身体素质。此外,还要注意避免劳累和长时间站立。
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