Table 3.

Mean Doppler echocardiogram results for minute 30 using PSV and T‐Tube: weaning success vs. failure (mean±SD).

	PSV	T‐tube	p*
LA (mm)
Success	33±3.8	34±6
Failure	35±3.2	35±2.6	0.68
RV (mm)
Success	18±3.8	18±4.1
Failure	20±5.7	22±2.7	0.12
LVS (mm)
Success	31±4.4	31±4.1
Failure	32±6.1	31±8.7	0.32
LVD (mm)
Success	51±3.9	51±5.2
Failure	54±6.2	54±7.7	0.77
SEP
Success	9±1.9	9±1.8
Failure	11±0.8	11±0.8	0.81
PW
Success	9±1.6	9±2.3
Failure	11±0.9	11±0.8	0.83
EF (%)
Success	70±8.4	69±6.1
Failure	71±10	73±10	0.23
E (m/s)
Success	0.70±0.23	0.80±0.17
Failure	0.82±0.22	0.81±0.24	0.16
A (m/s)
Success	0.77±0.23	0.76±0.26
Failure	0.71±0.23	0.69±0.22	0.34
E/A Ra
Success	1.12±0.47	1.15±0.46
Failure	1.31±0.65	1.38±0.84	0.84
IVRT (m/s)
Success	107±24	97±17
Failure	84±24	88±19	0.21
DT (m/s)
Success	233±64	215±61
Failure	192±36	198±35	0.48
E′ (m/s)
Success	0.105±0.03	0.102±0.03
Failure	0.108±0.03	0.096±0.03	0.23
A′ (m/s)
Success	0.121±0.03	0.140±0.8
Failure	0.123±0.04	0.106±0.03	0.11
E/E′ Ra
Success	7.92±4.33	8.54±3.39
Failure	7.83±2.37	8.62±1.84	0.86
Tei index
Success	0.61±0.19	0.53±0.13
Failure	0.58±0.20	0.48±0.12	0.94

A = peak velocity of A wave; A′ = A′ wave; DT = deceleration time; E = peak velocity of E wave; E′ = E′ wave; E/A Ra = E/A ratio; E/E′ Ra = E/E′ ratio; EF = ejection fraction; IVRT = isovolumetric relaxation time; LA = left atrium; LVD = left ventricle diastolic diameter; LVS = left ventricle systolic diameter; Tei index = myocardial performance index; PSV = pressure support ventilation; PW = posterior wall; SEP = interventricular septum.

^*ANOVA.