Table 1 Radiographic metrics
From: Novel computed tomographic chest metrics to detect pulmonary hypertension
Hypothesized predictors of PH | How measured |
|---|---|
Main pulmonary artery diameter (PA) | Widest lumen at or near level of PA bifurcation * |
Right pulmonary artery diameter (RPA) | Widest lumen caudal to ascending aorta |
Left pulmonary artery diameter (LPA) | Widest lumen |
Right descending pulmonary artery (RDPA) | Distance from lateral wall of right bronchus intermedius to lateral wall of RDPA (equivalent to the RDPA measurement on a chest x-ray) |
True right descending pulmonary artery (true RDPA) | RDPA lumen diameter only * |
True left descending pulmonary artery (true LDPA) | Lumen diameter distal to left upper lobe bronchus takeoff |
Right ventricular free wall (RV wall) | Mid-ventricle * |
Right ventricular lumen diameter (RV lumen) | Mid-ventricle * |
Left ventricular free wall (LV wall) | Mid-ventricle * |
Left ventricular lumen diameter (LV lumen) | Mid-ventricle * |
IV septum bowing into LV | Yes or no |
Left apical artery to corresponding bronchus ratio | Most apical bronchovascular pair |
Hilar diameter (HD) | At level of right middle lobe bronchus takeoff |
Hilar/Thoracic ratio | HD/Inner thoracic diameter (TD) measured at same level as HD |
Landmarks used to standardize predictors of PH | |
Ascending aorta diameter (AA) | Widest diameter at the level of the PA measurement * |
Descending aorta diameter (DA) | At same level as AA * |