目的 使用回顾性队列研究方法,探索心率变异性(HRV)与脑梗死是否存在相关性。方法 选择2020年3月至2022年6月期间因脑梗死在我院住院的1231例患者,搜索首次急性新发脑梗死前及发病后、符合24小时全程HRV分析要求的动态心电图记录。使用两独立样本的秩和检验比较脑梗死前、后时域及频域法HRV指标的差异性。按最高和最低四分位数把脑梗死前HRV指标分成3个水平,应用多因素Cox回归分析影响脑梗死发生速度的相关因素,应用Kaplan-Meier生存分析估计检测出不同HRV水平的时间距脑梗死的中位发病时间。结果 检索到32例患者首次脑梗死前符合要求的记录45份,检查时年龄70.0(62.5
74.5)岁。相应患者脑梗死后的记录22份。脑梗死前、后时域及频域法HRV各指标的差异均无统计学意义(P>0.05)。在调整了年龄、性别及基础病等因素后,低频与高频能量比(LF/HF)水平是唯一与脑梗死发生速度相关的指标(P=0.008),与高水平(LF/HF>3.0)相比,低水平(LF/HF
<
1.5)的HR为4.31(95%CI1.41~13.17),无脑梗死生存时间显著缩短(χ
2
=12.79
P=0.002),分别为5.0(95%CI 2.7~7.2)年和1.7(95%CI0.7~2.8)年。结论 24小时全程HRV指标LF/HF
<
1.5是老年人较快发生脑梗死的风险指标。
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