Table 2

Cardiac magnetic resonance: atrial volumes and function

Patients (n=30)Controls (n=30)P value
RA (body and appendage)
RA volume max, mL/m257.6 (46.8–64.4)59.8 (48.7–70.6)0.393
RA volume min, mL/m228 (24.7–34.8)29.3 (24.4–34.4)0.781
RA expansion index, %86.1 (68.7–114.9)95.7 (73.4–123.2)0.349
RA body
RA body volume max, mL/m238.3 (33.1–43.1)40 (34–50.3)0.289
RA body volume min, mL/m219.6 (17.3–22.6)20.1 (16.3–25.7)0.441
RA body expansion index, %93.1±31.995.5±37.50.759
RAA
RAA volume max, mL/m217.3 (13.9–22.4)17.4 (14.1–21.2)0.877
RAA volume min, mL/m29.3 (6.7–10.5)8.2 (6.3–10)0.465
RAA expansion index, %95.6±21.6108.7±25.80.026
LA (body)
LA volume max, mL/m244.5±6.744.7±8.30.907
LA volume min, mL/m219.4 (17.4–21.6)17.1 (15–21.9)0.171
LA expansion index, %126.2±28145±36.30.023
LAA
LAA volume max, mL/m23.3 (2.3–5.2)3.8 (2.5–5.4)0.544
LAA volume min, mL/m21.1 (0.6–2.1)1.1 (0.6–2.1)0.926
LAA expansion index, %185.6 (101.4–272.5)215.9 (133.3–326.9)0.237
RAA/RA ratio at maximum, %31.3±4.530.8±6.50.764
RAA/RA ratio at minimum, %31.1±5.129.3±6.10.158
Qp/Qs shunt ratio*0.96±0.080.98±0.080.320
  • Values are mean±SD, median (IQR) or number (%). Expansion indices are calculated as (maximal volume – minimal volume) ×100%/minimal volume.

  • Right atrium = right atrial body + right atrial appendage.

  • Statistically significant associations (P<0.05) denoted in bold.

  • *One subject had missing data

  • LA, left atrium; LAA, left atrial appendage; Qp/Qs, the ratio of total pulmonary to total systemic blood flow; RA, right atrium; RAA, right atrial appendage.