Introduction:

Respiratory support is an indication of admission to Intensive Care Units (ICU). The release of invasive mechanical ventilation (VMI), represents up to 40% of the time in VMI; comorbidities such as obesity are more frequent in the ICU; there are recommendations on the release of the VMI (LVMI) in this group of patients, however, there are no adjusted predictors of success for the Mexican population.

Objective:

To evaluate the diaphragmatic excursion (ED) as a predictor of success in the removal of IMV in obese patients (PO).

Material and methods:

A cross-sectional, prospective, comparative and analytical study was conducted in POs admitted to ICUs with IMV for more than 48 hours, demographic variables, surface respiration index (RSBI), ED were analyzed, the outcome was the success in LVMI.

Results:

The distribution by gender was women 42% and men 58%; age: 41.3 ± 12.8 years; hospital stay: 9.6 ± 4.6 days; VMI time: 8.8 ± 4.8 days, l body mass index (BMI): 33.3 ± 2.7; represented in grade I: 76%, grade II: 2%, grade III: 22%, RSBI: 59 ± 9.4; ED: 1.55 ± 0.11. The area under the curve (ABC) for RSBI was 0.60 and ED 0.77. Additionally, the best cut-off point for success was: RSBI < 44 with 100% sensitivity and specificity, and ED > 1.9 cm with 100% sensitivity and specificity.

Conclusion:

The best predictor of success was the ED with respect to the RSBI, new cut-off points for RSBI and ED are proposed.

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