双水平气道内正压通气对老年心功能Ⅳ级患者氨基端脑钠肽原的影响
쌍수평기도내정압통기대노년심공능Ⅳ급환자안기단뇌납태원적영향
Effect of bi-level positive airway pressure ventilation to N-terminal pro-brain natriuretic peptide in grade Ⅳ elderly heart failure patients
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