25 mm Hg), prominent precordial pulsations and "bounding pulses"Q. An ejection systolic murmurQ heard best at the 2nd left parasternal area. Metabolic acidosis not attributable to hypoperfusion and sepsis. Deteriorating respiratory status on day 3-4 after a period of relative stability. Increasing ventilator requirements and recurrent apneas. Unexplained CO2 retention, fluctuating F102 requirements.">