This document discusses fluid responsiveness and methods for assessing preload responsiveness. It summarizes that dynamic indices of preload responsiveness like pulse pressure variation (PPV) and stroke volume variation (SVV) can help identify patients who will respond to fluid by increasing their stroke volume. However, these indices have limitations and may not be reliable in patients with spontaneous breathing, arrhythmias, low tidal volumes, low lung compliance, high frequency ventilation, open chest conditions, or severe right ventricular failure. In these situations where the indices cannot be interpreted reliably, other dynamic tests are needed to assess fluid responsiveness.
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Fluid responsiveness in pratice
1. Prof. Jean-Louis TEBOULProf. Jean-Louis TEBOUL
Medical ICU
Bicetre hospital
University Paris South
France
Fluid responsiveness
in practice
2. • presence of hemodynamic instability/peripheral hypoperfusion
(mottled skin, hypotension, oliguria, hyperlactatemia…)
• and presence of preload responsiveness
• and limited risks of fluid overload
Decision of starting fluid administration
4. Predictors of fluid responsiveness/unresponsiveness
Can help to choose the best fluid strategy by:
1) identifiying the pts eligible for fluid infusion
2) avoiding to fluid overload patients,
who would be fluid unresponsive
5. preload responsiveness
preload unresponsiveness
Stroke
Volume
Ventricular preload
Fluid infusion will increase LV stroke volumeFluid infusion will increase LV stroke volume
only ifonly if both ventriclesboth ventricles areare preload responsivepreload responsive
Fluid responsiveness
equivalent to
biventricular preload responsiveness
7. 1802 pts Summary AUC
0.56
Crit Care Med 2013; 41:1774-1781
Crit Care Med 2013; 41: 1474-81
8. normal heartnormal heart
failing heartfailing heart
preload responsiveness
preload unresponsiveness
Stroke
volume
Ventricular preload
.
Dynamic indices of preload responsiveness
9. induces
only in pts with
biventricular
preload responsiveness
occurs only in pts with
biventricular
preload responsiveness
correlates with the magnitude
of the
induced by
cyclic changes in SV fluid responsivenessMV
10. A B Ventricular preload
Stroke volume
preload responsiveness
preload
unresponsiveness
11. PPmax PPmin
PPPPmaxmax - PP- PPminmin
(PP(PPmaxmax ++ PPPPminmin) /2) /2
PPV =PPV =
Am J Respir Crit Care Med 2000; 162:134-8Am J Respir Crit Care Med 2000; 162:134-8
Arterial catheterArterial catheter
15. PPV
Chest 2005;128;848-854
Chest 2004, 126:1563-1568
Crit Care Med 2005;33:2534-9
M. Cannesson, J. Slieker, O. Desebbe, F. Fahdi,O. Bastien, JJ. Lehot
X. Monnet1,2*
, L. Guerin1,2
, M. Jozwiak1,2
, A. Bataille1,2
, F. Julien1,2
, C. Richard1,2
, J-L. Teboul1,2
Anesth Analg 2011; 113:523-8
16.
17. rr
22
= 0. 85= 0. 85
Fluid-induced
changes in
cardiac index
(%)
∆PP (%) before fluid infusion
00
1010
2020
3030
4040
5050
00 1010 2020 3030 4040 5050
Am J Respir Crit Care Med 2000; 162:134-8Am J Respir Crit Care Med 2000; 162:134-8
The larger the ∆PP before fluid infusion,
the larger the increase in CO after fluid infusion
The smaller the PPV before fluid infusion,
the smaller the increase in CO after fluid infusion
18. Calculated automatically and displayed in real-time
by usual hemodynamic monitors
Pulse Pressure VariationPulse Pressure Variation
All these monitors are suitable
to display PPV in real-time
20. Chest 2005;128;848-854
X. Monnet1,2*
, L. Guerin1,2
, M. Jozwiak1,2
, A. Bataille1,2
, F. Julien1,2
, C. Richard1,2
, J-L. Teboul1,2
Assessing fluid responsiveness by stroke volume variation
in mechanically ventilated patients with severe sepsis
G. Marx, T. Cope, L. McCrossan, S. Swaraj, C. Cowan, SM. Mostafa,
R. Wenstone, M. Leuwer
European Journal of Anaesthesiology 2004; 21:132-138
34. Volume responsiveness is a physiological phenomenon
related to a normal preload reserve.
Therefore,Therefore, detecting volume responsivenessdetecting volume responsiveness
must notmust not lead to infuse fluidlead to infuse fluid systematically.systematically.
The decision of fluid infusion must be based
on the presence of criteria of peripheral hypoperfusion
Limitations of respiratory variability indicesLimitations of respiratory variability indices
35. • impossible to interpret in pts with spontaneous breathing activity
Limitations of respiratory variability indicesLimitations of respiratory variability indices
37. • impossible to interpret in pts with spontaneous breathing activity
• impossible to interpret in patients with arrhythmias
Limitations of respiratory variability indicesLimitations of respiratory variability indices
50
70
90
110
mmHg PPmax
PPmin
38. • impossible to interpret in pts with spontaneous breathing activity
• difficult to interpret if tidal volume is too low
• impossible to interpret in patients with arrhythmias
Limitations of respiratory variability indicesLimitations of respiratory variability indices
39. PPV 8 %
1- Specificity
Sensitivity
PPV 12.8 %
Normal TV
Low TV
40. • impossible to interpret in pts with spontaneous breathing activity
• difficult to interpret if tidal volume is too low
• impossible to interpret in patients with arrhythmias
Limitations of respiratory variability indicesLimitations of respiratory variability indices
• difficult to interpret if lung compliance is too low
41. Crs < 30 mL/cmH2O
0 20 40 60 80 100
100
80
60
40
20
0
100-Specificity (%)
Sensitivity
Crs ≥ 40 mL/cmH2O
30 ≤ Crs < 40 mL/cmH2O
Ability of PPV to predict fluid responsiveness in function of lung compliance
42. • impossible to interpret in pts with spontaneous breathing activity
• difficult to interpret if tidal volume is too low
• impossible to interpret in patients with arrhythmias
Limitations of respiratory variability indicesLimitations of respiratory variability indices
• difficult to interpret if lung compliance is too low
• difficult to interpret in case of high frequency ventilation
PPV can be not reliable when the heart rate/respiratory rate is > 3.6
De Backer et al Anesthesiology 2009
43. • impossible to interpret in pts with spontaneous breathing activity
• difficult to interpret if tidal volume is too low
• impossible to interpret in patients with arrhythmias
Limitations of respiratory variability indicesLimitations of respiratory variability indices
• difficult to interpret if lung compliance is too low
• difficult to interpret in case of high frequency ventilation
• difficult to interpret under open-chest conditions
• difficult to interpret in case of severe RV failure
Mahjoub et al Crit Care Med 2009, Wyler von Ballmoos et al Crit Care 2010
44. • impossible to interpret in pts with spontaneous breathing activity
• difficult to interpret if tidal volume is too low
• impossible to interpret in patients with arrhythmias
Limitations of respiratory variability indicesLimitations of respiratory variability indices
• difficult to interpret if lung compliance is too low
• difficult to interpret in case of high frequency ventilation
• difficult to interpret under open-chest conditions
• difficult to interpret in case of severe RV failure
In all these situations and in case of any doubt about interpretation
other reliable dynamic tests are required
… and are now available
Editor's Notes
In this meataanalysis, Marik and colleagues reviewed the studies that addressed the issue of predicting fluid responsiveness with CVP. Overall, a low value of the area under the curve was found confirming that CVP cannot predict fluid responsiveness. Importantly, they concluded that CVP should not be used to make clinical decisions regarding fluid management.