PPV can be used to predict fluid responsiveness in patients with circulatory shock.However, it is affected by many factors, which leads to the decrease of the applicability of PPV in ICU.Therefore, the investigators studied the predictive value of PPV in the patients with different influencing factors;and the method to improve the predictive value,which can improve the application of PPV in ICU.
The investigators studied the predictive value of PPV in the patients with different influencing factors;and the method to improve the predictive value,which can improve the application of PPV in ICU.