Efficacy of endotracheal tube suctioning in intubated intensive care unit patients determined by in vivo catheter-based optical coherence tomography-a pilot study

The effects of open and closed system endotracheal suctioning methods on suctioning frequency, amount of secretion, and haemodynamics: A single-blind, randomised, 2 × 2 crossover trial

BACKGROUND

Several studies have revealed that clinicians cannot suction all available secretion in the trachea and perform more frequent suctioning with a closed suctioning system (CSS) than with an open suctioning system (OSS). There are also studies claiming that the CSS is as effective as the OSS, based on either the amount of secretion, the frequency of suctioning, or haemodynamic parameters alone. However, there is no study examining all at once.

OBJECTIVES

This study aims to determine whether the CSS is as effective for secretion removal, suctioning frequency, tidal volume (VT), and peripheral oxygen saturation (SpO2) as the OSS.

METHODS

The study used a single-blind, randomised, 2 × 2 crossover (2-method, 2-arm, 2-period) design. One hundred intubated patients were randomly assigned to two study arms. Thirty-four were randomised to the CSS on the first day and the OSS on the second day (AB arm), and 35 were randomised to the OSS on the first day and the CSS on the second day (BA arm). A 12-h washout period was set between them. Haemodynamic parameters were measured just before suctioning and in the 5th minute after suctioning. The secretions obtained after suctioning were weighed, and the frequency of suctioning was recorded.

RESULTS

There were no effects of method, period, or carryover on suctioning frequency and amount of secretion in the 2 × 2 crossover design t-test (p > 0.05). In the OSS, there was a weak, linear, and negative correlation between the amount of secretion and SpO2, and between VT and SpO2 measured before and after suctioning (p < 0.05 for all).

CONCLUSIONS

Open and closed suctioning systems were similar in terms of haemodynamic alterations, amounts of secretion, and frequency of suctioning. The CSS was as effective as the OSS.

REGISTRATION NUMBER

NCT04053751.

A growing battlefield in the war against biofilm-induced antimicrobial resistance: insights from reviews on antibiotic resistance

Biofilms are a common survival strategy employed by bacteria in healthcare settings, which enhances their resistance to antimicrobial and biocidal agents making infections difficult to treat. Mechanisms of biofilm-induced antimicrobial resistance involve reduced penetration of antimicrobial agents, increased expression of efflux pumps, altered microbial physiology, and genetic changes in the bacterial population. Factors contributing to the formation of biofilms include nutrient availability, temperature, pH, surface properties, and microbial interactions. Biofilm-associated infections can have serious consequences for patient outcomes, and standard antimicrobial therapies are often ineffective against biofilm-associated bacteria, making diagnosis and treatment challenging. Novel strategies, including antibiotics combination therapies (such as daptomycin and vancomycin, colistin and azithromycin), biofilm-targeted agents (such as small molecules (LP3134, LP3145, LP4010, LP1062) target c-di-GMP), and immunomodulatory therapies (such as the anti-PcrV IgY antibodies which target Type IIIsecretion system), are being developed to combat biofilm-induced antimicrobial resistance. A multifaceted approach to diagnosis, treatment, and prevention is necessary to address this emerging problem in healthcare settings.

Photoinactivation of Staphylococci with 405 nm Light in a Trachea Model with Saliva Substitute at 37 °C

The globally observed rise in bacterial resistance against antibiotics has increased the need for alternatives to antibiotic treatments. The most prominent and important pathogen bacteria are the ESKAPE pathogens, which include among others Staphylococcus aureus, Klebsiella pneumoniae and Acinetobacter baumannii. These species cause ventilator-associated pneumonia (VAP), which accounts for 24% of all nosocomial infections. In this study we tested the efficacy of photoinactivation with 405 nm violet light under conditions comparable to an intubated patient with artificial saliva for bacterial suspension at 37 °C. A technical trachea model was developed to investigate the visible light photoinactivation of Staphylococcus carnosus as a non-pathogen surrogate of the ESKAPE pathogen S. aureus (MRSA). The violet light was coupled into the tube with a fiber optic setup. The performed tests proved, that photoinactivation at 37 °C is more effective with a reduction of almost 3 log levels (99.8%) compared to 25 °C with a reduction of 1.2 log levels. The substitution of phosphate buffered saline (PBS) by artificial saliva solution slightly increased the efficiency during the experimental course. The increased efficiency might be caused by a less favorable environment for bacteria due to for example the ionic composition.