医学临床研究
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JOURNAL OF CLINICAL RESEARCH  2026, Vol. 43 Issue (2): 254-257    DOI: 10.3969/j.issn.1671-7171.2026.02.021
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Effects of Different Doses of Metoprolol Tartrate Combined with Basic Treatment on Cardiac Function and Heart Rate Variability in Elderly Patients with Conventional Hypertension and Heart Failure
SUN Yanpeng1, ZHU Yinchuan2
1. Guyang Town Health Center, Lankao Henan 475312;
2. the Second Affiliated Hospital of Zhengzhou University, Zhengzhou Henan 450000
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