過度換氣症候群(hyperventilation syndrome,HVS)又称通气过度综合征[1]、高通气综合征[2],是由于通气过度,超过生理代谢所需而引起的综合征,具有与焦虑相关(情绪紧张、癔病发作等)的呼吸困难及呼吸急促,并伴有全身很多躯体和精神神经表现的临床症状[3]。
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過度換氣症候群有许多历史异名:“慢性過度換氣症候群”chronic hyperventilation syndrome、CHVS)、“失能性過度換氣症候群”(dysfunctional breathing hyperventilation syndrome)、“隐秘搐搦”(cryptotetany[4])、“痉挛素质”(spasmophilia[5])、“潜伏搐搦”(latent tetany)、“中枢神经元过度兴奋综合征”(central neuronal hyper excitability syndrome)等等。
過度換氣症候群表现为精神紧张、焦虑、恐惧、害怕死亡,呼吸困难、胸闷窒息感、胸部不适或胸痛、呼吸深或快,心慌或心悸、心动过速,头昏、视物模糊,四肢末梢、面部及口周麻木、发紧与针刺感;严重者手指、上肢强直,手足搐搦,意识模糊,晕厥等。但查无相应的器质病因。
過度換氣症候群的病理机制是二氧化碳排出过量导致呼吸性碱中毒,由過快或過深的呼吸所造成,導致身體排出過多的二氧化碳,引發呼吸性碱中毒,亦即血液pH值過高,影響了神经系统的正常放电生理过程,部分患者會感到在手、足、唇等部位感到麻痺或微微叮咬感、口齒不清、暈眩、胸痛、心跳加速。患者越緊張,呼吸越快,令症狀出現惡性循環,嚴重者更會昏厥。
該症狀可由生理或心理造成,患者誤以為自己缺氧,加快呼吸,但其動脈血中的氧化量仍然正常,只是二氧化碳含量過低,引致血管收縮,同时因為玻尔效应的影響,讓人體對重要器官的輸氧量減少。
过度换气综合症是暈眩症十分常見的誘因。 25%的暈眩症患者被診斷患有HVS。最佳診斷方法是讓患者快速呼吸兩分鐘。這樣會誘發症狀,以確定患者的症狀是由於呼吸過度導致的。這項檢查只能在患者沒有症狀的時候進行。
每分鐘呼吸量是每分鐘由一個人的肺一分鐘吸入或呼出的空氣量。呼吸醫學資料(見下表)顯示病人的呼吸的空氣量是未患病人士的2-3倍。[來源請求]
更多信息 情况, 每分鐘呼吸量(±標準差) ...
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由于呼吸快速的原因很多,必须先排除器质病因后,才给予过度通气症状治疗。
- 罩袋治疗:利用口罩、面罩、纸袋、塑料袋等,使口鼻不透气重复呼吸,此时吸入气体中二氧化碳浓度提高而减轻症状;但是有些学者不建议使用[25]。
- 调整呼吸节律与深度:腹式呼吸训练等[26]。
- 药物治疗:抗焦虑药、β受体拮抗剂、选择性5-羟色胺再摄取抑制剂,严重者需要镇静催眠、补充钾盐、推注葡萄糖酸钙[27]。
当症状缓解后,随诊可加强[28][29]:
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呼吸病学(第3版), 第3版, 978-7-117-31906-5
中国心理卫生协会临床心理卫生手册. 内科分册, 第1版, 978-7-117-13017-2