Abstract:Objective To explore the sensitivity and specificity of ambulatory electrocardiography (AECG) in the auxiliary diagnosis of stable and variant angina pectoris. Methods Patients with suspected stable and variant angina pectoris were selected, each group with 50 cases. AECG examination was performed, and its diagnostic sensitivity and specificity was analyzed by using coronary angiography as the gold standard. The duration of QRS complex and ECG characteristics of the two groups were recorded. Results Coronary angiography results show that out of 50 patients suspected with stable angina pectoris, 45 cases are positive, and the positive coincidence rate of AECG examination is 97.78%. Among 50 cases suspected with variant angina pectoris, 43 cases are positive, and the positive coincidence rate of AECG examination is 95.35%. The sensitivity and specificity of AECG examination in diagnosing stable angina pectoris are 95.56% and 80.00%, respectively while its sensitivity and specificity for variant angina pectoris are 93.02% and 85.71%, respectively. In the stable angina pectoris group, the duration of QRS complex is significantly shorter than that in the variant angina pectoris group (P<0.05) while the detection rate of ST-T depression is significantly higher than that in the variant angina pectoris group. However, the proportion of T-wave inversion, and the
detection rates of ST-T depression complicating T-wave inversion in the stable angina pectoris group are significantly lower than those in the variant angina pectoris group (P<0.05). Conclusion The sensitivity and specificity of AECG examination are high for diagnosing stable and variant angina pectoris with clear image features, which provides important references for differential diagnosis.