Figure 2:

Correlations between rest and exercise pulmonary vascular resistance (PVR). [A] Exercise PVR was only modestly correlated with resting PVR (R² 0.38), while many patients with normal resting PVR had elevations during exercise, as well as patients with higher resting PVR that became more normal during exercise, indicating intact pulmonary vascular reserve [B]. Dashed line in [A] shows the line of identity, while dashed line in [B] shows resting PVR 1.74 WU.