Correlation Between ΔPP/HR and ΔSV During Fluid Challenge.
Correlation Between ΔPP/HR and ΔSV During Fluid Challenge.
In high perioperative risk patients, guidelines suggest intraoperative haemodynamic
 optimization by measurement of stroke volume (SV) to guide fluid resucitation.This strategy
 requires an invasive monitoring and learning. Some studies tried to find SV surrogates based
 on haemodynamic usual parameters. In an experimental hemorrhagic shock, SV was correlated to
 the pulse pressure (PP) / heart rate (HR) ratio.

 The investigators hypothesized that SV variations (ΔSV) would be correlated to the PP/HR
 ratio variations (ΔPP / HR) during fluid challenge, and ΔPP / HR would be able to detect a
 ΔSV greater than 10%.
Inclusion Criteria:

 -  a suspected hypovolemia, based on clinical or paraclinical parameters.

 -  a fluid challenge decision at the discretion of the anaesthesiologist physician in
 charge of the patient.

 Exclusion Criteria:

 -  Minor or major patient under guardianship,

 -  oesophageal Diseases