Fluid balance and weaning outcomes
- 762 Downloads
To examine the relationship of fluid balance and weaning outcomes.
We prospectively collected demographic, physiological, daily fluid balance (measured inputs minus outputs), and weaning data from 87 mechanically ventilated patients.
We examined 87 patients, a median age of 66 years, APACHE II of 22, and performed 205 breathing trials (BT); 38 patients (44%) were successfully extubated after their first BT with minimal or no pressure support.
Positive fluid balance (inputs>outputs) in the 24, 48, and 72 h and cumulatively (from hospital admission) prior to weaning were significantly greater in weaning failures than successes. Both univariate and multivariate analyses, adjusted for duration of mechanical ventilation and presence of chronic obstructive pulmonary disease, showed negative cumulative fluid balance 24 h prior to BTs (OR=2.9) and cumulative fluid balance (OR=3.4) to be independently associated with first-day weaning success. Similar relationships were demonstrated when all weaning attempts were analyzed. Negative fluid balance was as predictive of weaning outcomes as f/Vt (likelihood of success was 1.7 for patients with negative fluid balance 24 h prior to weaning and 1.2 for those with f/Vt<100 min−1 l−1). Although administration of diuretics was associated with more negative fluid balance, it was not independently associated with weaning outcomes.
These data suggest that fluid balance, a potentially modifiable factor, is associated with weaning outcomes. A randomized study is required to determine whether diuresis to treat positive fluid balance expedites liberation from mechanical ventilation.
KeywordsWeaning Extubation Mechanical ventilation Fluid Resuscitation
- 3.MacIntyre NR, Cook DJ, Ely EW Jr, Epstein SK, Fink JB, Heffner JE, Hess D, Hubmayer RD, Scheinhorn DJ (2001) Evidence-based guidelines for weaning and discontinuing ventilatory support: a collective task force facilitated by the American College of Chest Physicians; the American Association for Respiratory Care; and the American College of Critical Care Medicine. Chest 120:375S-95SCrossRefPubMedGoogle Scholar
- 12.Upadya A, Ogbata S, Muralidharam V, Amoateng-Adjepong Y, Manthous CA (2003) Cumulative fluid balance affects weaning outcomes. Am J Respir Crit Care Med 167:A301Google Scholar
- 13.Hosmer DW, Lemeshow S (2000) Applied logistic regression. Wiley, New YorkGoogle Scholar
- 16.Epstein CD, Peerless JR, Mohamed HF, Wrenn ER, Kuestner ME (2003) Relationship between fluid balance & weaning in older critically ill surgical patients. Am J Crit Care 13:273Google Scholar