The aim of this study will be to compare the fluid management in acute respiratory distress syndrome ARDS guided by electrical cardiometry (EC) versus the guidance with simplified conservative fluid protocol, Fluid and Catheter Treatment Trial "FACTT Lite". Group (A) consists of 35 patients: Fluid management in this group will follow a simplified conservative fluid protocol, "FACTT Lite" The FACTT Lite provided three possible instructions determined by the CVP and urine output: furosemide administration, fluid bolus, or no intervention. Group (B) consists of 35 patients: Fluid will be allowed according to an FTc-based fluids algorithm protocol and the type of bolus fluids will be determined according to Transthoracic fluid content (TFC), vasopressors and inotropes will be given according to reading of EC reading of systemic vascular resistance (SVR) and index of contractility (I CON).

Inclusion Criteria:

• Acute onset within one week
• Mild to moderate ARDS (FiO2/PaO2) less than 300 mmHg and more than 100 mmHg with a minimum PEEP of 5 cmH2O
• Bilateral lung opacities consistent with pulmonary edema on chest radiogram or lung ultrasound, cardiac failure, and fluid overload should be excluded in the absence of a definite cause of ARDS
• ARDS due to pulmonary cause.

Exclusion Criteria:

• Hemodynamic instability, patients on vasopressor,
• Barotrauma
• organ/s dysfunction at presentation.
• Pregnant