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The Ultrasound Journal

Table 2 Echocardiographic and physiological parameters of included patients undergoing 14 sessions of spontaneous breathing trial

From: Right ventricular free wall longitudinal strain during weaning from mechanical ventilation using high-flow or conventional oxygen treatment: a pilot study

Variable

Mechanical ventilation

HFOT

T-piece

p value*

RVFWSL, %

22.3 (19.7–26.4)

25.0 (21.2–27.8)

24.7 (21.7–28.1)

0.415

TAPSE, mm

22.1 (18.7–24.4)

23.2 (20.3–26.0)

22.1 (19.6–24.0)

0.088

S’ velocity, cm/s

11.0 (8.8–13.0)

13.0 (9.8–13.0)

11.5 (9.8–13.0)

0.214

FAC, %

42.5 (37.0–46.5)

42.0 (37.8–45.3)

42.5 (36.0–45.5)

0.827

RVD1, cm

3.7 (3.0–4.0)

3.5 (2.9–4.0)

3.7 (2.9–4.1)

0.174

RVD2, cm

2.9 (2.8–3.3)

3.0 (2.9–3.2)

3.0 (2.9–3.3)

0.408

RVD3, cm

5.8 (4.3–6.8)

5.8 (4.3–6.9)

6.2 (4.2–6.7)

0.742

RA-R,%

30.0 (24.0–38.8)

35.5 (25.0–43.0)

36.5 (27.8–43.5)

0.004a

RA volume, ml

35.5 (30.0–48.8)

36.5 (33.3–44.5)

37.0 (33.0–48.3)

0.708

EF, %

50.5 (42.8–55.5)

54.0 (47.5–58.3)

50.5 (45.7–56.5)

0.006b

SAP, mmHg

143.0 (124.0–153.0)

143.5 (131.0–162.2)

143.5 (135.8–162.0)

0.137

DAP, mmHg

68.5 (62.5–75.8)

66.5 (60.8–72.3)

68.0 (62.3–71.3)

0.118

Heart rate, bpm

83.5 (79.8–97.0)

86.0 (80.8–96.8)

84.0 (80.0–97.3)

0.274

PaO2/FiO2

280.1 (219.9–333.1)

265.0 (200.0–311.1)

295.0 (207.1–330.0)

0.102

PaCO2, mmHg

36.0 (31.8–38.5)

35.5 (33.0–39.3)

35.5 (33.8–37.3)

0.202

ScvO2, %

68.4 (61.5–74.3)

73.9 (66.4–75.7)

71.2 (68.3–74.4)

 < 0.001c

VT, ml §

498.5 (476.3–529.8)

457.0 (396.0–608.3)

485.0 (379.5–588.8)

0.786

Respiratory f, bpm #

21.0 (17.5–24.5)

27.0 (23.5–30.0)

29.0 (26.0–32.0)

 < 0.001d

Respiratory f/VT, bpm/L #

41.0 (34.6–55.8)

57.3 (43.6–67.7)

61.9 (46.9–76.7)

0.004e

PEEP, cmH2O

6.0 (5.0–7.0)

   

Pplateau, cmH2O

16.5 (14.5–18.8)

   

Pdriving, cmH2O

10.5 (8.5–11.8)

   
  1. SBT: spontaneous breathing trial; HFOT: high-flow oxygen treatment; RVFWSL: right ventricular free wall longitudinal strain; TAPSE: tricuspid annular plane systolic excursion; S′ velocity: tricuspid annular peak systolic velocity; FAC, right ventricular fractional area change; RVD1, right ventricular basal dimension; RVD2: right ventricular midcavity dimension; RVD3: right ventricular longitudinal dimension; RA-R: right atrial reservoir strain; SAP: systolic arterial pressure; DAP: diastolic arterial pressure; E: left ventricular ejection fraction; PaO2: partial pressure of arterial oxygen; FiO2: fraction of inspired oxygen; PaCO2: partial pressure of arterial carbon dioxide; ScvO2: central venous oxygen saturation; VT: tidal volume; f: frequency; PEEP: positive end-expiratory pressure
  2. *For statistically significant differences, pairwise comparisons using Bonferroni correction were performed between the
  3. three groups, with significant results presented as footnotes of this table
  4. ** RVFWS values are presented as absolute values. Higher RVFWS values signify better cardiac function
  5. § Via a Wright’s spirometer
  6. # Measured at 2 min after disconnection from mechanical ventilation
  7. aMechanical ventilation vs HFOT (p = 0.036) and mechanical ventilation vs T-piece (p = 0.047),
  8. bmechanical ventilation vs HFOT (p = 0.009),
  9. cmechanical ventilation vs HFOT (p = 0.006) and mechanical ventilation vs T-piece (p = 0.011),
  10. dmechanical ventilation vs HFOT (p = 0.002), mechanical ventilation vs T-piece (p < 0.001), and HFOT vs T-piece (p = 0.023),
  11. emechanical ventilation vs T-piece (p = 0.037)
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