Comparison of preoperative parameters between survivors and nonsurvivors
| Parameters | Survivors | Nonsurvivors | p-valuea |
| Subjects n | 26 | 6 | |
| Age yrs | 52±13 | 48±18 | 0.66 |
| Mean Psa mmHg | 91±10 | 94±12 | 0.40 |
| Duration of symptoms months | 27±20 | 31±32 | 0.75 |
| Mean Pra mmHg | 3±3 | 7±3 | 0.013 |
| Mean Ppa mmHg | 45±8 | 51±10 | 0.13 |
| Systolic Ppa mmHg | 82±17 | 87±18 | 0.51 |
| Diastolic Ppa mmHg | 25±5 | 33±6 | 0.014 |
| CI L·min−1·m−2 | 2.6±0.5 | 1.9±0.4 | 0.003 |
| PVR dynes·sec·cm−5 | 821±266 | 1224±337 | 0.016 |
| PPf | 1.26±0.21 | 1.06±0.16 | 0.03 |
| Pa,O2 kPa | 7.5±1.0 | 8.5±1.6 | 0.19 |
| torr | 57±8 | 64±12 | |
| Operative approach (median : lateral) | 12:14 | 4:2 | 0.37 |
Values are presented as mean±sd. Duration of symptoms: duration of symptoms between onset and operation; mean Psa: mean systemic arterial pressure; mean Pra: mean right atrial pressure; Ppa: pulmonary arterial pressure; CI: cardiac index; PVR: pulmonary vascular resistance; PPf: fractional pulse pressure; Pa,O2: arterial oxygen tension; median: median sternotomy; lateral: lateral thoracotomy. a: Mann-Whitney U-test and Chi-squared test, appropriate.