A Comparison of Adaptive Support Ventilation (ASV) and Conventional Volume-Controlled Ventilation on Respiratory Mechanics in Acute Lung Injury/ARDS

Ik Su Choi; Jung Eun Choi; Sang Bum Hong; Chae Man Lim; Younsuck Koh

doi:10.4266/kjccm.2009.24.2.59

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Original Article A Comparison of Adaptive Support Ventilation (ASV) and Conventional Volume-Controlled Ventilation on Respiratory Mechanics in Acute Lung Injury/ARDS: Ik Su Choi, Jung Eun Choi, Sang Bum Hong, Chae Man Lim, Younsuck Koh; DOI: https://doi.org/10.4266/kjccm.2009.24.2.59

¹Division of Pulmonary and Critical Care Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. yskoh@amc.seoul.kr

²Division of Pulmonology, Department of Internal Medicine, Myongji Hospital, Kwandong University College of Medicine, Goyang, Korea.

³Division of Pulmonary and Critical Care Medicine, Maryknoll Hospital, Busan, Korea.

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Abstract

BACKGROUND
ASV is a closed-loop ventilation system that guarantees a user-set minimum per-minute volume in intubated patients, whether paralyzed or with spontaneous breathing. Here, we tested the effects of ASV onrespiratory mechanics and compared them with volume-controlled ventilation (VCV).
METHODS
Thirteen patients meeting the criteria for acute lung injury (ALI)/acute respiratory distress syndrome (ARDS) were enrolled. All patients were paralyzed to eliminate spontaneous breathing. We started with VCV (VCV1), then used ASV followed by VCV modes (VCV2), maintaining minute volume as much as that of VCV1.
RESULTS
During ASV, compared with VCV1, the inspiratory and expiratory tidal volumes and expiratory resistance increased. Conversely, the total respiratory rate and maximum pressure decreased. No changes in the arterial blood gases, heart rate, or mean systemic pressure were noted during the trial.
CONCLUSIONS
In ALI/ARDS patients, although no differences were observed in the arterial blood gas analysis between the two modes, ASV provided better respiratory mechanics in terms of peak airway pressure and tidal volume than VCV.

Keywords: ALI/ARDS;ASV;VCV;

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