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Plethysmographic dynamic indices predict fluid responsiveness in septic ventilated patients

Abstract

Objectives

In septic patients, reliable non-invasive predictors of fluid responsiveness are needed. We hypothesised that the respiratory changes in the amplitude of the plethysmographic pulse wave (ΔPPLET) would allow the prediction of changes in cardiac index following volume administration in mechanically ventilated septic patients.

Design

Prospective clinical investigation.

Setting

An 11-bed hospital medical intensive care unit.

Patients

Twenty-three deeply sedated septic patients mechanically ventilated with tidal volume ≥ 8 ml/kg and equipped with an arterial catheter and a pulse oximetry plethysmographic sensor.

Interventions

Respiratory changes in pulse pressure (ΔPP), ΔPPLET and cardiac index (transthoracic Doppler echocardiography) were determined before and after volume infusion of colloids (8 ml/kg).

Measurements and main results

Twenty-eight volume challenges were performed in 23 patients. Before volume expansion, ΔPP correlated with ΔPPLET (r 2 = 0.71, p < 0.001). Changes in cardiac index after volume expansion significantly (p < 0.001) correlated with baseline ΔPP (r 2 = 0.76) and ΔPPLET (r 2 = 0.50). The patients were defined as responders to fluid challenge when cardiac index increased by at least 15% after the fluid challenge. Such an event occurred 18 times. Before volume challenge, a ΔPP value of 12% and a ΔPPLET value of 14% allowed discrimination between responders and non-responders with sensitivity of 100% and 94% respectively and specificity of 70% and 80% respectively. Comparison of areas under the receiver operator characteristic curves showed that ΔPP and ΔPPLET predicted similarly fluid responsiveness.

Conclusion

The present study found ΔPPLET to be as accurate as ΔPP for predicting fluid responsiveness in mechanically ventilated septic patients.

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Authors and Affiliations

Authors

Corresponding author

Correspondence to Karim Bendjelid.

Additional information

This work was performed in the Medical Intensive Care Unit, Centre Hospitalier, Belfort, France.

Funding: No external funding

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Feissel, M., Teboul, JL., Merlani, P. et al. Plethysmographic dynamic indices predict fluid responsiveness in septic ventilated patients. Intensive Care Med 33, 993–999 (2007). https://doi.org/10.1007/s00134-007-0602-6

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  • DOI: https://doi.org/10.1007/s00134-007-0602-6

Keywords

  • Fluid resuscitation
  • Heart–lung interactions
  • Volume responsiveness
  • Monitoring