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Table 1 Comparison of dosimetric data in patients’ plans with and without CPAP

From: CPAP (Continuous Positive Airway Pressure) is an effective and stable solution for heart sparing radiotherapy of left sided breast cancer

 With CPAP Median (SD)Without CPAP Median (SD) 
Lung Volume (cc)1506 (348)945 (220.5)p < .0001
Mean Lung Dose (both lungs)6.68 Gy (5.8)6.39 Gy (3.5)p = 0.42
Lung V526.3%(11.9)25.9 (16.6)p = 0.87
Lung V1015.9%(9.18)16.4 (14.75)p = 0.41
Lung V2011.3%(7.7)11.74 (13.7)p = 0.22
Heart Volume (cc)351.9 (84.97)352.8 (122.6)p = 0.17
Mean Heart Dose1.34 Gy (0.72)2.45 Gy (1.9)p = .0075
Heart V2.5Gy7.9%(10.2)19.51% (12.12)p = .0022
Heart V1015.88%(9.2)16.4 (14.8)p = 0.41
  1. SD Standard deviation
  2. Vx connoted the volume of the organ receiving “x” dose