Background: Echocardiographic criteria of right ventricular dysfunction (RVD) in acute pulmonary embolism (PE) differ among published studies. Assessment of RV systolic function remains difficult because of the RV's complex shape. We aimed to evaluate RV systolic function with TAD in patients (pts) with acute PE. TAD (QLAB, Philips Medical Imaging) was based on a tissue-tracking algorithm that is ultrasound beam angle independent for automated detection of tricuspid annular displacement.
Design: Prospective and observational study.
Methods: All adults' pts who were diagnosed with PE from December 2008 to December 2009 at Princess Grace Hospital, Monaco were eligible for this study after exclusion of history of heart failure. We evaluated 36 consecutive pts with PE (18 male, mean age 62.7 years), which underwent echocardiography, plasma BNP titration during the first day after admission, and a second echocardiography obtained within 48 hours before discharge.
Results: TAD value were significantly lower in pts with abnormal RV function by echocardiogram (15.9 ± 0.3 vs. 12.7 ± 0.2 ; P = 0.026). Pts with a normal BNP (<80 pg/ml) had an elevated TAD (16.4 ± 0.2 vs. 11.2 ± 0.3 mm ; P < 0.0001). At discharge, echocardiographic data were obtained from 33 pts (mean: 8.3 ± 3.5 days). RV end diastolic diameter, RV to LV diameter, pulmonary arterial systolic pressure, mean pulmonic valve acceleration time, RV FAC, Sa and TAD were significantly improved. There was no difference between TAD among pts with echocardiographic RVD at baseline vs. pts without RVD (14.9 ± 3.7 vs. 16.1 ± 2.9 mm ; P = 0.3). Four pts who deteriorated during short-term observation had substantially lower TAD values than those with uncomplicated courses (7.7 ± 0.4mm vs. 14.6 ± 0.2 mm ; P = 0.001). In conclusion, impaired TAD was associated with decreased RV systolic function in pts with acute PE. To identify the clinical meaning of decreased TAD, larger trials with longer follow-up periods are needed.
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