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Noninvasive Ventilation Intolerance: Characteristics, Predictors, and Outcomes.

Jinhua Liu1, Jun Duan2, Linfu Bai1

  • 1Department of Respiratory Medicine, First Affiliated Hospital of Chongqing Medical University, Chongqing, China.

Respiratory Care
|December 31, 2015
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Summary

Noninvasive ventilation (NIV) intolerance, a common reason for NIV failure, negatively impacts patient outcomes. Younger patients with elevated heart and respiratory rates are at higher risk for intolerance.

Keywords:
intoleranceintubationnoninvasive ventilationpredictor

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Area of Science:

  • Critical Care Medicine
  • Respiratory Medicine
  • Pulmonary Diseases

Background:

  • Noninvasive ventilation (NIV) is a crucial therapy for acute respiratory failure.
  • Patient intolerance to NIV is a significant factor contributing to treatment failure.
  • The characteristics, predictors, and clinical outcomes associated with NIV intolerance remain incompletely understood.

Purpose of the Study:

  • To investigate the incidence, risk factors, and consequences of NIV intolerance in patients with acute respiratory failure.
  • To identify patient demographics and physiological parameters associated with NIV intolerance.
  • To evaluate the impact of NIV intolerance on clinical outcomes, including intubation rates and mortality.

Main Methods:

  • A prospective observational study was conducted in a respiratory intensive care unit.
  • 961 patients with acute respiratory failure requiring NIV were enrolled.
  • NIV intolerance was defined as cessation of therapy due to patient refusal despite attempts at intermittent use, and risk factors were analyzed using logistic regression.

Main Results:

  • NIV intolerance occurred in 5.2% of subjects (50 patients) after a median of 2.4 hours.
  • Independent risk factors for intolerance included younger age and higher heart rate before NIV, and higher heart rate and breathing frequency after 1-2 hours of NIV.
  • Intolerant patients showed no physiological improvement and had significantly higher rates of intubation (44.0% vs 25.8%) and mortality (34.0% vs 22.4%).

Conclusions:

  • NIV intolerance is associated with poorer clinical outcomes, including increased intubation and mortality.
  • Younger age, elevated heart rate, and rapid breathing frequency are predictive of NIV intolerance.
  • Addressing patient discomfort and optimizing NIV settings are crucial for improving tolerance and treatment success.