Do heart rate and respiratory rate variability improve prediction of extubation outcomes in critically ill patients?

Do heart rate and respiratory rate variability improve prediction of extubation outcomes in critically ill patients? Critical Care, 2014, 18:R65

Seely, AJE, et al.

http://ccforum.com/content/pdf/cc13822.pdf

Prolonged ventilation and failed extubation are associated with increased harm and cost. The 
added value of heart and respiratory rate variability (HRV and RRV) during spontaneous 
breathing trials (SBTs) to predict extubation failure remains unknown.