Intensive Care Medicine

, Volume 22, Issue 12, pp 1345–1350

Effects of continuous (CPAP) and bi-level positive airway pressure (BiPAP) on extravascular lung water after extubation of the trachea in patients following coronary artery bypass grafting

  • R. Gust
  • H. Schmidt
  • B. W. Böttiger
  • H. Böhrer
  • E. Martin
  • A. Gottcchalk
Original

Abstract

Objective

To evaluate the effects of continuous positive airway pressure (CPAP) and bilevel positive airway pressure (BiPAP) on extravascular lung water during weaning from mechanical ventilation in patients following coronary artery bypass grafting.

Design

Prospective, randomized clinical study.

Setting

Intensive care unit at a university hospital.

Patients

Seventy-five patients following coronary artery bypass grafting.

Interventions

After extubation of the trachea, patients were treated for 30 min with CPAP via face mask (n=25), with nasal BiPAP (n=25), or with oxygen administration via nasal cannula combined with routine chest physiotherapy (RCP) for 10 min (n=25).

Measurements and results

Extravascular lung water (EVLW), pulmonary blood volume index (PBVI) and cardiac index (CI) were obtained during mechanical ventilation (T1), T-piece breathing (T2), interventions (T3), spontaneous breathing 60 min (T4) and 90 min (T5) after extubation of the trachea using a combined dye-thermal dilution method. Changing from mechanical ventilation to T-piece breathing did not show any significant differences in EVLW between the three groups, but a significant increase in PBVI from 155±5 ml/m2 to 170±4 ml/m2 could be observed in all groups (p<0.05). After extubation of the trachea and treatment with BiPAP, PBVI decreased significantly to 134±6 ml/m2 (p<0.05). After treatment with CPAP or BiPAP, EVLW did not change significantly in these groups (5.5±0.3 ml/kg vs 5.0±0.4 ml/kg and 5.1±0.4 ml/kg vs 5.7±0.4 ml/kg). In the RCP-treated group, however, EVLW increased significantly from 5.8±0.3 ml/kg to 7.1±0.4 ml/kg (p<0.05). Sixty and 90 min after extubation, EVLW stayed at a significantly higher level in the RCP-treated group (7.5±0.5 ml/kg and 7.4±0.5 ml/kg) than in the CPAP-(5.6±0.3 ml/kg and 5.9±0.4 ml/kg). No significant differences in CI could be observed within the three groups during the time period from mechanical ventilation to 90 min after extubation of the trachea.

Conclusions

Mask CPAP and nasal BiPAP after extubation of the trachea prevent the increase in extravascular lung water during weaning from mechanical ventilation. This effect is seen for at least 1 h after the discontinuation of CPAP or BiPAP treatment. Fuether studies have to evaluate the clinical relavance of this phenomenon.

Key words

Weaning CPAP BiPAP Extravascular lung water Cardiac surgery 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • R. Gust
    • 1
  • H. Schmidt
    • 1
  • B. W. Böttiger
    • 1
  • H. Böhrer
    • 1
  • E. Martin
    • 1
  • A. Gottcchalk
    • 1
  1. 1.Department of AnaesthesiaUniversity of HeidelbergHeidelbergGermany

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