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Table 3 Right ventricular structure and function indices in overall obstructive sleep apnoea patients before and after 6 months of continuous positive airway pressure (CPAP) treatment.

From: Effects of CPAP on right ventricular myocardial performance index in obstructive sleep apnea patients without hypertension

  CPAP treatment p-value
Overall (n = 18) Before After  
Right atrium mm 23.9 ± 3.0 23.7 ± 3.2 NS
RVFWD mm (5–8) 7.1 ± 2.1 6.2 ± 1.7 0.001
RVEDD mm (9–26) 25.4 ± 3.6 25.0 ± 3.3 NS
E-velocity (m/s) 0.4 ± 0.1 0.6 ± 0.1 0.0001
A-velocity (m/s) 0.6 ± 0.13 0.5 ± 0.9 0.001
E/A ratio (>1)* 0,7 ± 0.1 1.2 ± 0.2 0.0001
IVRT ms (<100)* 106.9 ± 24.0 91.1 ± 18.6 0.001
DT ms (<220)* 245.5 ± 61.0 210.2 ± 46.8 0.001
VPR cm*s-1 (>55)* 41.1 ± 9.9 60.9 ± 10.2 0.0001
MPI % (39 ± 5)* 62.2 ± 9.3 47.3 ± 8.4 0,0001
  1. Data are presented as mean ± SD. *Normal values, RVFWD: Right ventricular free wall diameter, RVEDD: Right ventricle end-diastolic diameter, E- velocity: Early tricuspid flow velocity, A- velocity: Lately tricuspid flow velocity, E/A: Ratio of early and lately tricuspid flow velocity, IVRT: Ýsovolumic relaxation time, DT: tricuspid deceleration time, VPR: Velocity of tricuspid flow propagation, MPI: Myocardial performance index of right ventricle, NS: nonsignificant.