الفهرس 
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Abstract
We have recruited 100 patients, after either incomplete data or dropouts; the study was done on 70 patients admitted to the ICU on random base.
No disease related mortality had been correlated.
Increased daily reduction of RFCSA had most significant correlation with mortality (P value = 0.001), death occurred within mean of 1.38 days from maximum daily reduction of the RFCSA.
Cutoff points from the ROD CURVE for right QMT, left QMT, right RFCSA, left RFCSA, IEDT and EEDT were supposed to be:>9.77,>15, >16.67, >12.5, >12.63, >12.5 respectively, with best specificity and positive predictive value was found in right RFCSA (95.45, 87.5 respectively) while best sensitivity and negative predictive value was found in left RFCSA (65.38, 82 respectively).
Significant negative correlation between vasoactive agent free period and maximum daily reduction in RFCSA, QMT, EIDT, EEDT (P value = 0.001).
Significant correlation between duration of mechanical ventilation and maximum daily reduction in RFCSA, QMT (P value = 0.001).
Increase in length of hospital stay had been correlated only in the survivors best with QMT (P value = 0.001).
Reduction in the minimum of DTF had been moderately significantly correlated to increase in days of MV and vasoactive free periods in ICU.
Although no correlation was found between the minimum of DTF and length of stay of both ICU and hospital stay, it has been moderately correlated to both ICU and hospital stay.
Minimum of diaphragmatic excursion had moderate significant correlation with the ICU, 28 days and hospital mortality.
Using the area under curve cutoff points from the ROC CURVE for DTF and DE form prediction of successful weaning of MV were supposed to be:≥0.28, ≤1.2 respectively.
Significant increase in the length of mechanical ventilation and decrease in the vasoactive agent free period in % of stay in ICU had been observed with diminution of the diaphragmatic excursion.