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Volume 15 No. 04
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Accepted Papers

Case Reports

Autocycling During Noninvasive Positive Pressure Ventilation Producing a Prolonged Severe Apnea and Syncope

Susana Mu, MBBS Hons1,2; Linda Rautela, B. AppSc (Physiotherapy)1,3,4; Mark E. Howard, MBBS, FRACP, GDEB, PhD1,3,4,5; Liam Hannan, MBBS, FRACP, PhD1,2,3,4
1Austin Health, Heidelberg, Victoria, Australia; 2Northern Health, Epping, Victoria, Australia; 3Institute for Breathing and Sleep, Heidelberg, Victoria, Australia; 4Victorian Respiratory Support Service, Heidelberg, Victoria, Australia; 5University of Melbourne, Parkville, Victoria, Australia

Autocycling is a form of patient-ventilator asynchrony that can occur during mechanical ventilation. In the case described, autocycling during noninvasive ventilation led to severe hyperventilation and subsequently produced a prolonged central apnea that resulted in syncope. This case represents the first description of a severe adverse event from autocycling during noninvasive ventilation.


Mu S, Rautela L, Howard ME, Hannan L. Autocycling during noninvasive positive pressure ventilation producing a prolonged severe apnea and syncope. J Clin Sleep Med. 2019;15(4):663–665.

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