Abstract 5779: Quantification of Right Ventricular Dyssynchrony in Acute Pulmonary Embolism and Right Ventricular Pressure Overload Using Speckle-Tracking Strain Imaging
Acute right ventricular (RV) pressure overload can alter RV systolic synchronicity associated with RV expansion and wall motion abnormalities in patinets with acute pulmonary thrombo-embolism (APTE). Twenty patients with massive or sub-massive APTE (mean age 57 ± 18 years, estimated peak systolic pulmonary pressure 51 ± 16mmHg) had echocardiography with speckle-tracking strain imaging on admission. RV dyssynchrony was defined as the time difference from earliest to latest peak strain among 6-sites (basal septum, mid septum, apical septum, apical free wall, mid free wall, basal free wall) form apical 4-chamber view using speckle-tracking longitudinal strain imaging. All intervals were corrected for heart rate (corrected interval = measured interval/(RR interval)1/2). Twenty normal subjects (Control: mean age 58 ± 10 years) were also assessed RV function and synchronicity for comparison. APTE had significantly low RV fractional area change (29 ± 10%* vs. 50 ± 7%), low global RV strain (−13 ± 4%* vs. −25 ± 3%), and large RV dyssynchorny (220 ± 103msec* vs. 78 ± 39msec) compared with Control (*p<0.05 vs. Control). After hemodynamic recovery from acute RV pressure overload by primary thrombolysis and/or anticoagulation therapy, both global RV strain and dyssynchrony were improved (−18 ± 4%† and 130 ± 53msec†, †p<0.05 vs. APTE on admission, respectively). Acute RV pressure overload induced reversible RV systolic dyssynchrony associated with RV systolic dysfunction in patients with APTE.