GIÁ TRỊ CỦA MỘT SỐ CHỈ SỐ ĐIỆN TÂM ĐỒ TRONG CHẨN ĐOÁN RỐI LOẠN CHỨC NĂNG TÂM TRƯƠNG THẤT TRÁI TRÊN BỆNH NHÂN HỘI CHỨNG ĐỘNG MẠCH VÀNH MẠN

Abstract

Objectives: This study aims to evaluate certain electrocardiographic indices in diagnosing left ventricular diastotic dysfunction in the patient of Chronic coronary syndrome. Subjects and methods: This descriptive prospective cross sectional study was conducted from August 2022 to June 2023 among 254 patients who were divided into two groups: a group of patients with left ventricular diastolic dysfunction and a group without left ventricular diastolic dysfunction, diagnosed with significant coronary microvascular syndrome (stenosis ≥ 50%) on transdermal coronary angiography and underwent echocardiography at the Vietnam Heart Institute. Results: The diagnosis of left ventricular diastolic dysfunction using the PTF-V1 threshold with a threshold of >3.5 mV.ms had a sensitivity of 83.3%, specificity of 68.0%, and AUC of 0.76; using the Tend-P threshold of <=280 ms had a sensitivity of 79.3%, specificity of 63.5%, and AUC of 0.754; using the Tend-Q threshold of <=360 ms had a sensitivity of 64.8%, specificity of 80.0%, and AUC of 0.792; when combined with other factors, the diagnostic value of left ventricular diastolic dysfunction using the Tend-Q/ (PQ x age) index with a threshold of <=0.03 had a sensitivity of 75.9% and specificity of 72.0%, with an AUC of 0.782. Conclusions: On the electrocardiogram, the Tend-Q (ms) index and the Tend-Q/ (PQ x age) index are shown to be the most valuable indices in predicting the presence of left ventricular diastolic dysfunction.