Pulse Pressure Variation Measured During Valsalva Maneuver to Predict Fluid Responsiveness Under Open-chest Condition

Pulse Pressure Variation Measured During Valsalva Maneuver to Predict Fluid Responsiveness Under Open-chest Condition in the Patients Undergoing Off-pump Coronary Arterial Bypass Grafting

Pulse pressure variation (PPV) is a well-known dynamic preload indicator to predict fluid responsiveness. However, its usefulness in open-chest conditions has been equivocal. The investigators evaluated whether PPV measured during Valsalva maneuver can predict fluid responsiveness after sternotomy.

Inclusion Criteria:

- Adult patients undergoing elective off-pump coronary arterial bypass grafting

Exclusion Criteria:

• Preoperative LV EF <= 35%
• Moderate or severe valvular heart disease
• Cardiac arrhythmia
• Intracardiac shunt
• Severe renal or liver disease
• Moderate to severe pulmonary hypertension (mean PAP > 35 mmHg)
• Patients with bullous lung disease or combined pneumothorax