Objective:To explore the value of Impedance Pulmonary Rheogram in clinical diagnosis of elderly patients with chronic cardiac insufficiency. Methods:50 patients over 65 years old with chronic cardiac insufficiency were selected and divided into four groups according to NYHA, 23 elderly patients without disease were allocated into control group. WA-820 digital impedance rheometer was used to detect and collect the data. NT-proBNP level was tested and analyzed. Results:Comparedwith the control group, the indexes of Z0, HS, Q-BI, B-YI, P2-Y, Q-B/B-Y, O/C were significantly different (t=3.913, 4.761, -5.466, 5.529, 6.114, -3.901, -6.431,P<0.05). The AUC of the diagnosis with NT-proBNP level was 0.878. The sensitivity was 72%, and the specificity was 87%. The AUC of the diagnosis with Impedance Pulmonary Rheogram was 0.869. The sensitivity was 84%, and the specificity was 78%. NT-proBNP and Impedance Pulmonary Rheogram were combined to evaluate the state of heart function. If the test was parallel, the sensitivity was 88% and the specificity was 69%. If the test was in series, the sensitivity was 68% and the specificity was 96%. There was no significant statistical significance of the indexes of Impedance Pulmonary Rheogram in the cardiac function Ⅰ-Ⅱ group (P>0.05). There were significant differences between the cardiac function Ⅲ-Ⅳ group (P<0.05). Conclusion:Cardiac function status can be assessed with Impedance Pulmonary Rheogram in elderly patients with chronic heart failure. Digital impedance angiography combined with BNP/NT-proBNP can improve the diagnostic efficiency of cardiac function assessment in elderly patients. |
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