|   | 
        Atrial | 
        No atrial | 
        p value | 
       
      
        | Dilatation | 
        dilatation | 
       
      
        | Patients,    N | 
        2,268 | 
        5,409 | 
          | 
       
      
        | Clinical    characteristics | 
       
      
        | Age    (years) | 
        68±16 | 
        65±17 | 
        <0.001 | 
       
      
        | Gender    (males) | 
        1,012    (45%) | 
        2,485    (46%) | 
        0.289 | 
       
      
        | Cancer  | 
        390    (17%) | 
        940    (17%) | 
        0.847 | 
       
      
        | Chronic    heart failure | 
        368    (16%) | 
        418 (7.7%) | 
        <0.001 | 
       
      
        | Chronic    lung disease | 
        382    (17%) | 
        684    (13%) | 
        <0.001 | 
       
      
        | Physical    examination | 
       
      
        | Heart    rate (bpm)  | 
        97±21 | 
        92±20 | 
        <0.001 | 
       
      
        | Systolic    blood pressure levels (mm Hg) | 
        127±23 | 
        131±23 | 
        <0.001 | 
       
      
        | Electrocardiogram | 
       
      
        | Atrial    fibrillation | 
        305    (13%) | 
        352    (6.5%) | 
        <0.001 | 
       
      
        | Right    bundle branch block | 
        608    (29%) | 
        749    (15%) | 
        <0.001 | 
       
      
        | S1Q3T3pattern | 
        624 (30%) | 
        797    (16%) | 
        <0.001 | 
       
      
        | Laboratory    tests | 
       
      
        | Creatinine    levels >1.2 mg/dL | 
        507    (22%) | 
        845    (16%) | 
        <0.001 | 
       
      
        | PO2    levels (mm Hg) (N=5,215) | 
        62±19 | 
        68±22 | 
        <0.001 | 
       
      
        | Sat O2    levels (%) (N=5,438) | 
        89±7 | 
        92±6 | 
        <0.001 | 
       
      
        | Echocardiogram | 
       
      
        | RA    diameter (cm) (N=207) | 
        4.3±1.5 | 
        3.3±1.6 | 
        <0.001 | 
       
      
        | Visualization    of thrombus | 
        105    (4.6%) | 
        67    (1.2%) | 
        <0.001 | 
       
      
        | RV    hypokinesis | 
        1,185    (52%) | 
        562    (10%) | 
        <0.001 | 
       
      
        | PAP    levels (mm Hg) (N=4,649) | 
        55±18 | 
        39±15 | 
        <0.001 | 
       
      
        | RV    diameter (cm) (N=1,314) | 
        3.9±1.2 | 
        3.0±0.7 | 
        <0.001 | 
       
      
        | TAPSE    (cm) (N=1,590) | 
        1.8±0.8 | 
        2.1±0.9 | 
        <0.001 | 
       
      |