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Table 6 Operation details and treated lesions of the initial BPA session

From: Bilateral versus unilateral balloon pulmonary angioplasty for inoperable chronic thromboembolic pulmonary hypertension

  First BPA sessions (N = 92) Unilateral BPA (N = 54) Bilateral BPA (N = 38) *p value
Operation details
 Operation duration (minutes) 231.1 ± 63.5 232.5 ± 58.4 229.0 ± 70.8 0.80
 The amount of contrast media given (ml) 220.0 (180.0, 270.0) 230.0 (180.0, 300.0) 230.0 (200.0, 260.0) 1.00
 Dose area product (μGy m2) 1550.6 (951.1, 3450.1) 1550.6 (1090.0, 3485.4) 1560.1 (916.7, 3480.6) 0.90
 Largest balloon size used/session (mm) 3.5 (3.0, 4.5) 4.0 (2.9, 4.6) 3.0 (3.0, 4.3) 0.62
 Vessels treated/session 7.0 (4.3, 9.0) 6.0 (4.0, 8.0) 8.0 (5.8, 9.3) 0.04
 Total number of lobes treated (Lobes treated/session) 220 [2 (2, 3)] 103 [2 (1, 2)] 117 [3 (2, 4)] < 0.001
 Total number of left/right lower lobes treated (%) 124 (56.3) 51 (49.5) 73 (62.4) 0.06
Lesion type (treated lesions/session)
 Total number of treated lesions 738 [8 (5, 10)] 393 [7 (4, 10)] 345 [9 (6, 12)] 0.02
 Ring-like stenosis 64 [0 (0, 1)] 46 [0 (0, 2)] 18 [0 (0, 1)] 0.07
 Web lesions 575 [6 (3.3, 8)] 289 [5 (3, 7)] 286 [7.5 (5, 10)] 0.004
 Subtotal occlusion 71 [1 (0, 1)] 41 [1 (0, 1)] 30 [0.5 (0, 2)] 0.99
 Total occlusion 28 [0 (0, 0)] 17 [0 (0, 0)] 11 [0 (0, 0)] 0.72
Lesion location (treated lesions/session)
 Lobar arteries 5 4 1  
 Segmental arteries 180 [2 (0, 3)] 94 [1.5 (0, 3)] 86 [2 (0, 4)] 0.34
 Subsegmental arteries 553 [5 (4, 8)] 295 [5 (3, 8)] 258 [6 (4, 10)] 0.13
  1. Continuous variables are expressed as mean ± standard deviation or median and interquartile range according to variable distribution
  2. BPA balloon pulmonary angioplasty
  3. *Comparison between bilateral BPA and unilateral BPA