Table 1.
Right ventricular pressure-volume variables.
| Variable | Slope | 95% CI | p-value vs. 1 | r2 | Y intercept | 95% CI | p-value vs. 0 |
|---|---|---|---|---|---|---|---|
| RV ESP | 1.01 | 0.98–1.04 | 0.563 | 0.98 | ÷2.79 | ÷4.13;÷1.44 | <0.0001 |
| RV EDP | 1.01 | 0.92–1.09 | 0.911 | 0.88 | ÷1.06 | ÷1.47;÷0.64 | <0.0001 |
| RV ESV | 1.02 | 0.97–1.07 | 0.493 | 0.96 | 3.05 | 1.15–4.94 | 0.002 |
| RV EDV | 0.98 | 0.86–1.09 | 0.664 | 0.81 | 14.57 | ÷0.82–29.96 | 0.063 |
| RV SW | 1.05 | 0.95–1.16 | 0.302 | 0.86 | 63.49 | ÷146.30–273.30 | 0.548 |
| RV SV | 1.22 | 1.08–1.36 | 0.003 | 0.81 | ÷4.64 | ÷14.11–4.83 | 0.332 |
| RV EF | 0.90 | 0.81–1.00 | 0.043 | 0.84 | 7.51 | 1.73–13.28 | 0.012 |
| RV Ea | 0.61 | 0.55–0.68 | <0.0001 | 0.83 | 0.07 | 0.00–0.14 | 0.049 |
| RV dP/dt (max) | 1.07 | 0.99–1.15 | 0.104 | 0.91 | ÷50.36 | ÷83.55; ÷17.16 | 0.004 |
| RV dP/dt (min) | 0.92 | 0.85–0.99 | 0.024 | 0.90 | ÷23.53 | ÷56.10–9.05 | 0.154 |
| RV tau | 0.53 | 0.41–0.64 | <0.0001 | 0.53 | 9.94 | 4.84–15.05 | 0.0002 |
Slopes and intercepts with 95 % confidence intervals (95% CI) from linear fits of each variable during mechanical ventilation versus apnea. n=72 for all. RV, right ventricular; ESP, end-systolic pressure; EDP, end-diastolic pressure; ESV, end-systolic volume; EDV, end-diastolic volume; SW, stroke work; SV, stroke volume; EF, ejection fraction; Ea, arterial elastance; dP/dt, first derivative of pressure.