hello , thanks for using Health care magic. I had gone through all the data posted. by water bubbles in lungs doctor meant to say there is fluid in lungs suggestive of pulmonary edema. it suggests that patient is still in critical condition. as patient had sufferred massive heart attack its pumping capacity goes down and blood gets congested in lungs which causes water content to move from blood vessels into lungs causes respiratory distress for which Ventillator is necessary. so your patients condition is still critical.. Hopet his helps..