Objective:

Evaluating the behavior of intrapulmonary pressures with the inversion of the inspiration expiration index, during elective videolaparoscopic cholecystectomy.

Material and methods:

A phase three controlled clinical trial was conducted on intrapulmonary pressures during laparoscopic cholecystectomies at the «Manuel Ascunce Domenech» University Hospital, from September 2016 to February 2020, the universe consisted of patients who met the inclusion criteria, from which a sample of 106 patients was selected, by a simple randomizing method. The primary source of data collection was the medical records and the result of a survey. These data were collected in a model designed in correspondence with the bibliography reviewed.

Results:

Measured by variation in peak inspiratory pressure and plateau pressure after pneumoperitoneum, with significant decrease of both after inversion of I:E index. More than half of the patients presented arterial hypertension, arrhythmias and arterial hypotension, without them being related to the application of the inverted I:E index.

Conclusions:

The inversion of inspiratory expiration contributed to improve the effects of pneumoperitoneum on intrapulmonary pressures, with adequate oxygenation and no cardiovascular effects.