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随机取样361例(但剔除二尖瓣狭窄和心房颤动的患者),经超声心动图检查,左心房直径>4cm者82例(23%),左心房直径正常者279例(77%)。将P_tf-vi的异常标准从-0.03提高到-0.08,左心房增大的诊断敏感性从51%降到23%,而特异性从70%增加到93%.如果用特异性大于80%的标准,则敏感性降到50%以下。将P_tf-vl的标准从-0.04提高到-0.06,则敏感性降低不多(从42%降到38%).但特异性从86%提高到92%. 根据Bayes理论,在左心房增大的流行率不同的人群中,计算出P_tt-vl不同标准的正确诊断率、阳性预测准确度(positive predictive accuracy)和阴性预测准确度。可以看到P_tf-vl的任何标准,随着左心房增大的流行率增
A total of 361 patients (77%) with normal left atrial diameter were enrolled in a random sample of 361 patients (except patients with mitral stenosis and atrial fibrillation excluded). Echocardiography was performed in 82 patients (23%) with atrial diameter> 4cm. Increasing the abnormality of P_tf-vi from -0.03 to -0.08 decreased the diagnostic sensitivity of the left atrial enlargement from 51% to 23% and the specificity from 70% to 93% .If the specificity of P> Standard, the sensitivity drops below 50%. Increasing the P_tf-vl criterion from -0.04 to -0.06 reduced sensitivity less (from 42% to 38%) but increased specificity from 86% to 92% .According to Bayesian theory, The prevalence of different populations, calculated P_tt-vl different criteria for the correct diagnosis rate, positive predictive accuracy (positive predictive accuracy) and negative predictive accuracy. You can see any criteria for P_tf-vl, with an increasing prevalence of left atrial enlargement