Oximetry evaluation of absence of oxygen repletion of pre-endotracheal aspiration in patients intubated with septic shock: crossover clinical trial randomized

INTRODUCTION: This paper studied the effect of oxygen before aspiration in intubated patients in septic shock in the ICU . The research question is whether there are differences in oximetry values after endotracheal suction in the absence of oxygen increase in septic shock patients intubated without lung injury? The hypothesis is that no difference in oximetry values after endotracheal suctioning compared between the presence or absence of oxygen increase in septic shock patients intubated without lung injury. OVERALL OBJECTIVE: To compare the effectiveness of the recommendations laid out when the AARC guidelines increase oxygen endotraqual intubated patients in septic shock before aspiration. Specific aim to compare oximetric and hemodynamic variables measured after the expiration or absence of increase before aspiration in intubated patients in septic shock and create a standard operating protocol with the recommendations arising from the results of this test. METHOD: a randomized crossover trial, 2X2, one - arm , double-blind equivalence in patients with septic shock, mechanical ventilation admitted to the Intensive Unit (ICU) of a university Therapy large hospital in the city of Rio de Janeiro. A consecutive sample of 22 patients. Inclusion criteria were: suspected and/or confirmed septic shock , mechanical ventilation > 12 hours , fraction of inspired oxygen (FiO2) ideal < 95 %, positive end expiratory pressure (PEEP) < 16 mm / Hg. Exclusion criteria: weaning process , surgical with chronic obstructive pulmonary disease ( COPD ) Gold IV , pregnant or postpartum women, under 18 years, and thrombocytopenic (less than 50.000.000/mm3 ) devoid of arterial catheter. A simple randomization was performed by a sequence of numbers generated in a spreadsheet. The AB sequence was initially increase with O2 and BA group started without such maximization. Post- test with blood sampling for analysis of arterial blood gases were performed before and . After washout reversal between AB to BA groups occurred. The determination of carryover was performed by adding the values in both sequences being missing for all variables of primary and secondary outcomes . Comparison of means was performed using the Student t test for independent samples homoscedastic because the variances were equal and its equal non- parametric Mann - Whitney when the sample was not normal, both with two-tailed significance level of 5 % and range 95% confidence. For dichotomous variables, the Fisher exact test and analysis of clinical statistics were used were used the relative risk (RR), Absolute Risk Increase (ARA), Absolute Risk Reduction (ARR) all with 95% CI. RESULTS: The sample was predominantly elderly , female , low education and wage income . The inferential statistical analysis showed that the patient had hyperoxygenation with FiO2 above what was considered to be ideal for age reflecting a more prominent effect on PaO2 that was statistically significant with p < 0,05 for ARA does not cause hypoxemia , however was shown to hyperoxemia. The momentary increase in FiO2 causes a false negative rate of improvement that LPA may be a confounding factor for prognosis patient. For the other variables there was statistics nor clinical significance. CONCLUSION: The use of endotracheal suctioning without increase confers no injury to the patient regarding oximetric and hemodynamic variables and is beneficial regarding increase oxygen . PRODUCT: A creation of standard operating protocol is a way of documenting a practice that is already being used in at least 11 years , since 2002 , registered uneventful for critical patients in ICU.