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Decreased respiratory rate variability during mechanical ventilation is associated with increased mortality
Guillermo Gutierrez1, Aparna Das, Guillermo Ballarino
1Pulmonary, Critical Care and Sleep Medicine Division, The George Washington University MFA, 2150 Pennsylvania Ave, NW, Washington DC, 20037, USA. ggutierrez@mfa.gwu.edu
Intensive Care Medicine
|June 8, 2013
Summary
Reduced respiratory rate variability (RRV) in patients on mechanical ventilation is linked to higher mortality. Monitoring RRV may help predict outcomes for critically ill patients requiring ventilatory support.
Area of Science:
- Critical Care Medicine
- Respiratory Physiology
- Clinical Outcomes Research
Background:
- Mechanical ventilation is essential for critically ill patients but can alter respiratory patterns.
- Respiratory rate variability (RRV) is a physiological measure that may reflect patient status.
- Understanding RRV's role in outcomes for ventilated patients is crucial for improving care.
Purpose of the Study:
- To investigate the association between respiratory rate variability (RRV) and patient outcomes.
- To determine if RRV can predict mortality in patients receiving mechanical ventilation.
Main Methods:
- A prospective observational study included 178 patients on mechanical ventilation for at least 12 hours.
- Respiratory rate variability (RRV) was assessed using airway signal analysis and spectral methods.
- Patients were classified as high RRV (>40%) or low RRV (<40%), and mortality was tracked at 28 and 180 days.
Main Results:
- 131 patients had low RRV and 47 had high RRV; groups had similar initial disease acuity.
- Low RRV was significantly associated with increased 28-day mortality (HR 4.81) and 180-day mortality (HR 2.26).
- Independent predictors of 28-day mortality included low RRV, vasopressin use, and SAPS II score.
Conclusions:
- Decreased respiratory rate variability (RRV) during ventilatory support is a significant predictor of increased mortality.
- Further research is needed to elucidate the underlying mechanisms connecting low RRV to adverse outcomes.
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