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Mortality in acute non-invasive ventilation.

Dugal B Smith1,2, George T P Tay1,2, Karen Hay3

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Summary

Non-invasive ventilation (NIV) outside the ICU can treat acute hypercapnic respiratory failure. However, premorbid self-care inability and severe acidosis with hypercapnia predict mortality in these patients.

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Area of Science:

  • Medicine
  • Pulmonology
  • Critical Care

Background:

  • Non-invasive ventilation (NIV) is increasingly used outside intensive care units (ICUs).
  • Acute hypercapnic respiratory failure is a common indication for NIV.
  • Understanding outcomes and predictors of mortality is crucial for optimizing patient care.

Purpose of the Study:

  • To evaluate the outcomes of NIV use outside the ICU.
  • To identify factors associated with mortality in patients receiving NIV outside the ICU.

Main Methods:

  • A prospective study was conducted from March 2015 to March 2016.
  • Included 69 patients receiving NIV outside the ICU.
  • Collected data on patient demographics, indications for NIV, and outcomes, including mortality.

Main Results:

  • Acute hypercapnic respiratory failure was the most frequent indication (85%).
  • Multifactorial respiratory failure was present in 71% of patients.
  • Mortality rate was 22% (15 patients).
  • Premorbid inability to perform self-care (P=0.001) and severe acidosis (pH < 7.25) with hypercapnia (PaCO2 ≥ 75 mmHg) within 2 hours of NIV initiation (P=0.037) were significant predictors of mortality.
  • Older age showed a non-significant association with mortality.

Conclusions:

  • NIV can be utilized outside the ICU for acute hypercapnic respiratory failure.
  • Premorbid self-care deficits and severe physiological derangement upon NIV initiation are critical indicators of poor prognosis.
  • Risk stratification is essential for patients receiving NIV in non-ICU settings.