Fluid Responsiveness in Prone Patients

End Expiratory Occlusion Test and Tidal Volume Challenge Test for Assess Fluid Responsiveness in Prone Patients

To assess fluid responsiveness in prone patient

Inclusion Criteria:

• patients planed to prone position for treatment

Exclusion Criteria:

• no consent
• arrhythmia
• pregnancy
• pre existing pneumothorax
• pre existing fluid overload
• cannot insert arterial or central venous catheters