Ventilator dyssynchrony - Detection, pathophysiology, and clinical relevance: A Narrative review

Peter D Sottile, David Albers, Bradford J Smith, Marc M Moss, Peter D Sottile, David Albers, Bradford J Smith, Marc M Moss

Abstract

Mortality associated with the acute respiratory distress syndrome remains unacceptably high due in part to ventilator-induced lung injury (VILI). Ventilator dyssynchrony is defined as the inappropriate timing and delivery of a mechanical breath in response to patient effort and may cause VILI. Such deleterious patient-ventilator interactions have recently been termed patient self-inflicted lung injury. This narrative review outlines the detection and frequency of several different types of ventilator dyssynchrony, delineates the different mechanisms by which ventilator dyssynchrony may propagate VILI, and reviews the potential clinical impact of ventilator dyssynchrony. Until recently, identifying ventilator dyssynchrony required the manual interpretation of ventilator pressure and flow waveforms. However, computerized interpretation of ventilator waive forms can detect ventilator dyssynchrony with an area under the receiver operating curve of >0.80. Using such algorithms, ventilator dyssynchrony occurs in 3%-34% of all breaths, depending on the patient population. Moreover, two types of ventilator dyssynchrony, double-triggered and flow-limited breaths, are associated with the more frequent delivery of large tidal volumes >10 mL/kg when compared with synchronous breaths (54% [95% confidence interval (CI), 47%-61%] and 11% [95% CI, 7%-15%]) compared with 0.9% (95% CI, 0.0%-1.9%), suggesting a role in propagating VILI. Finally, a recent study associated frequent dyssynchrony-defined as >10% of all breaths-with an increase in hospital mortality (67 vs. 23%, P = 0.04). However, the clinical significance of ventilator dyssynchrony remains an area of active investigation and more research is needed to guide optimal ventilator dyssynchrony management.

Keywords: Acute respiratory distress syndrome; patient self-inflicted lung injury; ventilator dyssynchrony; ventilator-induced lung injury.

Conflict of interest statement

There are no conflicts of interest.

Copyright: © 2020 Annals of Thoracic Medicine.

Figures

Figure 1
Figure 1
Representative types of ventilator dyssynchrony – Examples of some types of commonly observed ventilator dyssynchronies. All examples demonstrate flow (L/min), airway pressure (cm H2O), esophageal pressure (cm H2O), and volume (ml)
Figure 2
Figure 2
Examples of transpulmonary pressures with and without spontaneous effort – During a pressure- or volume-controlled mechanical breath in a paralyzed patient (left), the transpulmonary pressure is the difference between the airway pressure and pleural pressures (25 = 30 - 5) and transvascular pressure is the difference between the capillary pressure and pleural pressures (5=10-5). In a spontaneously breathing mechanically ventilated patient (right), airway pressure is constant but pleural pressure is negative. This results in both increased transpulmonary pressure (45 = 30--15) and transvascular pressures (25=10--15), which may worsen lung injury and pulmonary edema. Paw: Airway pressure, Ppl: Pleural pressure, Pcap: Capillary pressure, PL: Transpulmonary pressure

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