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Effect of Sildenafil on cardiac output (CO), mean pulmonary artery pressure (mPAP), pulmonary capillary wedge pressure (PCWP), and pulmonary vascular resistance (PVR) on patients treated with LVAD and with persistent pulmonary hypertension. N indicates number of patients. * P<0.05 vs. pre-sildenafil. Comparisons made with paired t-test.
