Diagnostic performance of selected ECG findings in the recognition of reduced left ventricular ejection fraction (<0.50) in <i>T.cruzi</i> seropositive blood donors.

<p>Data is presented as median (interquartile range) * Reported if <0.05** HRV data available in 24 seropositive subjects with LVEF<0.50 and 433 with LVEF> = 0.50. seropositive and 458 seronegative subjects. QTc: corrected QT interval by Bazett's formula; HRV: heart rate variability; rmssd: root mean square of successive differences in normal RR intervals; sdnn: standard deviation of all normal RR intervals.</p

Demographic and medical characteristics of the study population, by <i>T.cruzi</i> antibody status.

<p>Data is presented as median (interquartile range) or numbers (%).</p>*<p>Reported if <0.05.</p>**<p>Available in 497 seropositive donors and 461 seronegative donors. NT-proBNP: NT-pro brain natriuretic peptide.</p

Quantitative ECG measurements in <i>T.cruzi</i> seropositive blood donors by left ventricular ejection fraction.

<p>A. PR interval. B. QRS duration. C. QT interval corrected by Bazett's formula.</p

ECG findings in <i>T.cruzi</i> seropositive blood donors by LVEF.

*<p>Reported if <0.05. VBP: ventricular premature beats; SPB: supraventricular premature beats; LBBB: left bundle branch block; RBBB: right bundle branch block; LAFB: left anterior fascicular block; Old MI: Old myocardial infarction, defined as major Q wave or minor Q waves with ST-T abnormalities; LVH: Left ventricular hypertrophy; major QT prolongation: QTi>115%; minor QT prolongation: QTi>111%; QTi: QT prolongation index: (QT/656) * (HR+100).</p

Quantitative ECG measurements in <i>T.cruzi</i> seropositive and seronegative subjects.

<p>Data is presented as median (interquartile range).</p>*<p>Reported if <0.05.</p>**<p>HRV data available in 467 seropositive and 458 seronegative subjects. QTc: corrected QT interval by Bazett's formula; HRV: heart rate variability; rmssd: root mean square of successive differences in normal RR intervals; sdnn: standard deviation of all normal RR intervals.</p