SO SÁNH LLN VÀ TỶ SỐ CỐ ĐỊNH FEV1/FVC TRONG CHẨN ĐOÁN RỐI LOẠN THÔNG KHÍ TẮC NGHẼN TẠI ĐƠN VỊ THĂM DÒ CHỨC NĂNG BỆNH VIỆN ĐẠI HỌC Y HÀ NỘI

Abstract

Objective: To compare the value of the lower limit of normal (LLN) and the fixed ratio FEV1/FVC < 0.7 in diagnosing obstructive pulmonary disease at the Pulmonary Function Testing Unit, Hanoi Medical University Hospital. Subjects and methods: A cross-sectional descriptive study was conducted on 76 patients undergoing respiratory function tests at the Pulmonary Function Testing Unit R19-02, Hanoi Medical University Hospital. Results: Among male patients, the prevalence of obstructive ventilatory disorder was 42.22% using the LLN criterion, compared to 40% using the fixed ratio (FEV₁/FVC < 0.7). In female patients, the prevalence was 6.45% using both criteria. In the entire study population, the prevalence was 27.63% according to LLN and 26.32% according to the fixed ratio. Conclusion: Both LLN and the fixed ratio (FEV₁/FVC < 0.7) are valuable diagnostic criteria for obstructive ventilatory disorders. However, LLN is recommended for improved diagnostic accuracy, especially in younger male patients with fewer risk factors.