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Double Cycling During Mechanical Ventilation: Frequency, Mechanisms, and Physiologic Implications.

Candelaria de Haro1,2, Josefina López-Aguilar1,2, Rudys Magrans1,2

  • 1Critical Care Center, Hospital Universitari Parc Taulí, Institut d'Investigació i Innovació Parc Taulí I3PT, Universitat Autònoma de Barcelona, Sabadell, Spain.

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Double cycling, a phenomenon in mechanical ventilation, is uncommon but occurs in all patients, potentially doubling tidal volumes. Tailoring gas delivery to patient demand is crucial due to associated physiologic factors.

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Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Mechanical Ventilation

Background:

  • Double cycling during mechanical ventilation can lead to excessive tidal volumes, posing a risk of lung injury.
  • Understanding the incidence and mechanisms of double cycling is essential for optimizing patient ventilation strategies.

Purpose of the Study:

  • To analyze the incidence, mechanisms, and physiological implications of double cycling in critically ill patients.
  • To compare double cycling rates and characteristics across different mechanical ventilation modes.

Main Methods:

  • Prospective observational study conducted in three general ICUs in Spain.
  • Analysis of 9,251 hours of mechanical ventilation across 67 adult patients on volume control (constant and decelerated flow) and pressure control ventilation.
  • Detailed examination of 9,694,573 breaths to identify and quantify double cycling events and associated factors.

Main Results:

  • Double cycling occurred in 0.6% of all breaths, observed in all patients studied.
  • Pressure control ventilation showed a higher incidence of double cycling (0.54%) compared to volume control with constant flow (0.27%) and decelerated flow (0.11%).
  • Double-cycled breaths could significantly increase tidal volume, with patient triggering accounting for 65.4% and reverse triggering for 34.6%.

Conclusions:

  • Double cycling is an infrequent but universal occurrence in mechanical ventilation, characterized by alternating periods of occurrence.
  • The volume delivered during double-cycled breaths can be substantial, particularly in volume control with constant flow ventilation.
  • Ventilator settings and patient neuroventilatory demand interact, necessitating individualized gas delivery to mitigate risks associated with double cycling.