Association Between Acute Kidney Injury During Invasive Mechanical Ventilation and ICU Outcomes and Respiratory...

Area of Science:

• Critical Care Medicine
• Nephrology
• Pulmonology

Background:

• Acute kidney injury (AKI) is a common complication in critically ill patients.
• The interplay between AKI and respiratory system mechanics during invasive mechanical ventilation (IMV) requires further elucidation.
• Understanding these interactions is crucial for optimizing patient outcomes in the intensive care unit (ICU).

Purpose of the Study:

• To compare ICU outcomes and respiratory system mechanics in patients with and without AKI during IMV.
• To investigate the impact of AKI on mortality, ventilator days, and ICU length of stay.
• To assess the association between AKI and respiratory parameters such as plateau pressure, compliance, and driving pressure.

Main Methods:

• Retrospective cohort study conducted in the ICUs of the University of California, San Diego.
• Patients were categorized based on the need for IMV and the presence/absence of AKI according to KDIGO criteria.
• Comparison of outcomes and respiratory mechanics across five distinct patient groups.

Main Results:

• Of 9,704 patients, 4,484 required IMV. 2,009 patients (45%) developed AKI during IMV.
• AKI during IMV was associated with a significantly higher mortality rate (22.4% vs. 5%, p < 0.01) and increased hazard of mortality (aHR 1.58).
• Patients with AKI experienced longer ventilator days, increased ICU stay, higher plateau pressures, lower respiratory compliance, and higher driving pressures (all p < 0.01).

Conclusions:

• AKI in invasively mechanically ventilated patients is linked to worse ICU outcomes, including increased mortality and prolonged resource utilization.
• AKI significantly impairs respiratory system mechanics, evidenced by changes in pressure and compliance parameters.
• Further research into ventilatory strategies for AKI patients and lung-kidney crosstalk mechanisms is warranted.