CASE PRESENTATION: An 83 year man was admitted to the ICU for dyspnea and severe hypoxemia following inefficient antibiotics treatment of bilateral pneumonia in emergency room. Failed with NPPV, He was intubated and PiCCO system was installed. Result shows extremely high GEDI 1620 ml/m2, therefore CRRT was initiated for negative fluid balance. When GEDI was reduced below 1300 ml/m2, CI decreased simultaneously. According to the Frank-Starling curve, GEDI of 1300 ml/m2 was seemed as being associated with a maximal CI for the patient. Next chest roentgenogram and abdomen CT scan showed three aneurysms which were responsible for the extremely high GEDI values.