Reigniting Intensive Care Unit Liberation.

BACKGROUND: The Society of Critical Care Medicine has established guidelines to manage pain, sedation, delirium, immobility, family participation, and sleep disruption in the intensive care unit, a set of interventions known as the intensive care unit liberation (ABCDEF) bundle. Adherence to these guidelines has shown positive results. LOCAL PROBLEM: In the intensive care units of a level I trauma academic teaching hospital in central Texas, the rate of bedside nursing staff adherence to the ABCDEF bundle was only 67.1% in January 2022. The aim of this quality improvement project was to improve adherence to the bundle. METHODS: Knowledge gaps were found to be the driver of the low adherence rate. Two primary needs were identified: (1) education on the elements of the ABCDEF bundle and (2) increased awareness and recognition of incomplete and incorrect documentation. Interventions included focused education on intensive care unit liberation. RESULTS: From February to June 2022, overall adherence to the ABCDEF bundle increased from 67.1% to 95.3%, ventilator use decreased by approximately 10%, and restraint use dropped by about 9%. The incidence of delirium increased, but this increase was due to incorrect patient assessment before the interventions. CONCLUSION: The results of this project are consistent with literature demonstrating that a multifaceted approach to improving ABCDEF bundle adherence can produce sustainable improvement in patient outcomes. This report may help other organizations facing similar challenges improve adherence to the bundle in a postpandemic environment.

In vivo determination of diffusive transport parameters in a superfused tissue.

To address the hypothesis that functional changes in tissue transport can be related to structural alterations, we combined mathematical modeling with in vivo experimentation. The model concept includes interstitial diffusion and removal by a distributed microvasculature. Transport of solute and water across the peritoneum is measured via a plastic chamber affixed to the abdominal wall of anesthetized Sprague-Dawley rats. Solutions containing [(14)C]mannitol, with or without vasoactive compounds [control (C; n = 10), C + nitroprusside (NP; n = 10), C + norepinephrine (NE; n = 10)], were infused into the chamber, and the volume and tracer concentrations were determined over 60 min to calculate the mass transfer coefficient (MTC) and the water flux. At 60 min, FITC-dextran (500 kDa) was given to mark the perfused vasculature. After euthanasia, the tissue under the chamber was frozen, dried, sliced with a cryomicrotome, and examined with fluorescent microscopy and quantitative autoradiography. The microvessel density (x10(3)/cm(2): NE, 50 +/- 10; C, 180 +/- 7.0; NP, 225 +/- 15) resulted in marked differences (P < 0.05) in water flux (mul.min(-1).cm(-2): NE, 0.1 +/- 0.1; C, 1.6 +/- 0.4; NP, 1.0 +/- 0.2) and in mannitol MTC (x10(3) cm/min: NE, 0.9 +/- 0.3; C, 3.8 +/- 0.3; NP, 3.6 +/- 0.6). Concentration profiles and calculated capillary permeability and tissue diffusivity were significantly different among the groups. These results demonstrate a direct correlation of mass transfer, diffusion, capillary permeability, and water flux with peritoneal vascular density and validate a method by which mechanistic changes in transport may be measured.