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Table 5 Log-rank test of survival and cumulative incidence of weaning from MV depending on the presence or absence of an abnormal RV echocardiography parameter

From: Feasibility, reproducibility and diagnostic usefulness of right ventricular strain by 2-dimensional speckle-tracking echocardiography in ARDS patients: the ARD strain study

Echocardiography parametersMean survival time, daysMean time to weaning from MV, days
Patients with a normal parameterPatients with an abnormal parameterpPatients with a normal parameterPatients with an abnormal parameterp
Abnormal cut-off values based on literature (Ref. [7])
 TAPSE < 12 mm25.5 ± 0.918.3 ± 3.40.005*13.6 ± 1.413.6 ± 2.40.32
 RV FAC < 35%25.5 ± 1.022.4 ± 2.20.2413.4 ± 1.615.8 ± 2.50.43
 S′ < 11.5 cm/s25.1 ± 1.323.9 ± 1.60.2113.7 ± 1.813.9 ± 1.80.75
Abnormal cut-off values based on 2015 EACVI/ASE guidelines (Ref. [4])
 TAPSE < 17 mm25.3 ± 1.123.4 ± 1.80.3113.6 ± 1.714.9 ± 2.30.57
 RV FAC < 35%25.5 ± 1.022.4 ± 2.20.2413.4 ± 1.615.8 ± 2.50.43
 S′ < 9.5 cm/s24.7 ± 1.124.2 ± 1.80.5714.5 ± 1.510.2 ± 2.00.55
Abnormal cut-off values derived from control patients (mean ± 2SD)
RV STE-derived parameters
 RV inferior LSS > − 17.6%25.3 ± 1.223.7 ± 1.60.5713.7 ± 1.814.6 ± 2.00.78
 RV lateral LSS > − 17.8%25.1 ± 1.123.9 ± 1.70.9415.8 ± 1.911.4 ± 1.50.13
 RV septal LSS > − 11.1%25.4 ± 1.122.6 ± 2.10.2414.5 ± 1.611.2 ± 1.50.68
 RV global LSS > − 17.4%24.2 ± 1.525.0 ± 1.30.4414.8 ± 2.213.5 ± 1.60.60
 RV global LSR > − 1.0225.0 ± 1.022.7 ± 2.80.4814.2 ± 1.414.6 ± 3.80.97
  1. Underline and * indicate significant correlation (p < 0.05); italic font: no significant correlation
  2. RV right ventricle, STE speckle-tracking echocardiography, LSS longitudinal systolic strain, LSR longitudinal systolic strain rate, TAPSE tricuspid annular plane systolic excursion, FAC fractional area change, S′ peak systolic velocity of tricuspid annulus by pulsed wave Doppler tissue imaging, MV mechanical ventilation
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