Table 2.
Characteristics of the study group: additional test parameters divided into particular procedures.
| Parameter | Median | Interquartile range |
|---|---|---|
| Electrocardiography | ||
| P-wave amplitude in lead II (mV) | 0.226 | 0.162–0.273 |
| R-wave amplitude in lead aVR (mV) | 0.538 | 0.314–0.795 |
| QRS duration (s) | 0.100 | 0.090–0.120 |
| RVSLI (mV) | 1.550 | 0.842–1.952 |
| Cardiopulmonary exercise test | ||
| VO2 peak (ml/kg/min) | 13.70 | 11.00–16.80 |
| VO2 AT (ml/kg/min) | 11.55 | 9.40–14.50 |
| VE/VCO2 slope (ml/kg/min) | 40.94 | 35.45–47.86 |
| Maximum load (MET) | 3.70 | 3.00–4.70 |
| Right heart catheterization | ||
| mPAPRHC (mmHg) | 42.25 | 36.00–56.00 |
| PCWP (mmHg) | 10.00 | 8.50–12.00 |
| PVR (thermodilution method; WU–wood unit) | 8.46 | 3.91–10.23 |
| CO (thermodilution method; l/min) | 4.60 | 4.13–5.57 |
| CI (thermodilution method; l/min × m2) | 2.61 | 2.29–3.04 |
| PVR (Fick’s method; WU) | 5.21 | 3.07–7.57 |
| CO (Fick’s method; l/min) | 5.48 | 4.65–6.79 |
| CI (Fick’s method; l/min × m2) | 2.96 | 2.50–3.72 |
| Echocardiography | ||
| LVEF vis. (%) | 60.00 | 55.00–60.00 |
| VCI diameter (mm) | 16.50 | 14.00–18.00 |
| TRPG (mmHg) | 61.00 | 40.50–89.00 |
| Estimated RAP (mmHg) | 5.00 | 3.00–5.00 |
| mPAPECHO (mmHg) | 44.09 | 28.23–61.17 |
| TAPSE (mm) | 20.00 | 17.00–22.00 |
| ACT (ms) | 97.00 | 90.00–107.50 |
| RV free wall thickness (mm) | 8.00 | 8.00–10.00 |
| RV four-chamber projection (cm) | 4.70 | 3.90–5.30 |
| RA area (cm 2 ) | 21.50 | 16.00–30.00 |
| Laboratory test | ||
| NT-proBNP (pg/ml) | 187.50 | 115.50–982.10 |
| Six-minute walk test | ||
| 6-MWD (m) | 480.00 | 430.00–540.00 |
6-MWD, six-minute walk distance; ACT, acceleration time of pulmonary flow; CI, cardiac index; CO, cardiac output; LVEF vis., left ventricle ejection fraction visually; mPAPECHO, mean pulmonary arterial pressure estimated by echocardiography; mPAPRHC, mean pulmonary arterial pressure obtained by RHC; NT-proBNP: N-terminal prohormone of brain natriuretic peptide; PCWP, pulmonary capillary wedge pressure; PVR, pulmonary vascular resistance; RA; right atrium; RAP, right atrium pressure; RHC, right heart catheterization; RV, right ventricle; RVSLI, right ventricle Sokolow-Lyon index; TAPSE, tricuspid annular plane systolic excursion; TRPG, tricuspid regurgitation pressure gradient; VCI, vena cava inferior; VE/VCO2 slope, minute ventilation to carbon dioxide production slope; VO2 AT, oxygen uptake at anaerobic threshold; VO2 peak, peak oxygen uptake.