Neurology:短暂性体位性低血压和帕金森患者的跌倒晕厥息息相关

2021-01-04 Freeman MedSci原创

短暂性体位性低血压和帕金森患者的跌倒晕厥息息相关

 
血管自主神经功能障碍(Cardiovascular autonomic failure )是帕金森氏症的一个常见的非运动特征。体位性低血压(OH)是它的特征标志,主要表现为站立后3分钟内持续的血压下降。OH 典型表现为反复发作的晕厥和直立不耐症(头晕,视力模糊,站立时颤抖) ,对 PD 患者的日常生活有重大影响。
 
有的研究发现OH 会增加帕金森病患者跌倒的风险,而其他研究则没有。提示 PD 患者心血管自主神经功能衰竭的症状负担可能与其他因素有关。
 
除了经典的 OH (cOH) ,还存在短暂性 OH (tOH),具体表现为OH 站立后的血压明显下降,但在30秒内恢复。它表现为短暂的、严重的头晕和视力模糊,是年轻人晕厥的一个未被认识的原因。站立后30秒内未能将血压稳定回基线值,这种现象被称为血压恢复延迟,多达30% 的老年人出现这种情况,并且与跌倒、直立不耐症和虚弱有关。
 
奥地利因斯布鲁克大学的Alessandra Fanciulli等人通过回顾性研究,对173例 PD 患者和173名对照者,评估了短暂性体位性低血压(tOH)的发生频率及其对帕金森氏症(PD)的影响,他们在连续无创血压监测下接受心血管自主功能检测。
 
他们首先筛选了站立后收缩压下降≥20mmhg 或舒张压下降≥10mmhg,1分钟内恢复正常的人,即tOH 。同时筛选了经典的OH,即收缩压下降≥20mmhg 或舒张压下降≥10mmhg,3分钟内血压恢复正常。对于帕金森病患者,他们还回顾了在跌倒、晕厥和直立不耐症自主神经测试前后6个月的医疗记录。
结果显示:24% 的 PD 患者和21% 的对照组出现 tOH,而19% 的 PD 患者出现 cOH,而对照组未出现cOH,这些结果与临床人口统计学或 PD 特异性无关。40% 的帕金森病患者有跌倒史,其中29% 是由于晕厥。有直立不耐症和晕厥史的帕金森病人站立时收缩压下降更严重,舒张压下降更明显,最明显的是在前30-60秒。
 
这个研究的重要意义在于发现了tOH 是一种年龄依赖性现象,至少和cOH一样常见。床旁的血压测量,可能忽略了垂直位置时的暂时性血压下降,但在帕金森病患者中,这可能会导致直立不耐受和晕厥。站立时进行连续无创血压监测可能有助于了解晕厥有关的帕金森病人跌倒情况。
 
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    2021-03-02 yinhl1978
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